物理学

 

学术动态
利用拓扑揭开铁基超导电子配对迷雾
超导态的最本质特征是存在电子之间的两两配对,其配对的特性—配对对称性是理解超导微观机理的一个重要窗口。根据对称性的不同,超导态可以分为s波、p波、d波等。在传统的理论中,p波配对的超导态由于其非平庸的...
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Atom Arrays for   Superresolution Imaging
Viewpoint Atom Arrays for Superresolution Imaging Jacob P. Covey   Department of Physics, University of Illinois Urbana-Champaign, Urbana, IL,   USA February 22, 2022• Physics 15, 23 A one-dimensional ar...
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A   Bose-Einstein-Condensate Boomerang
Synopsis A Bose-Einstein-Condensate Boomerang February 23, 2022•   Physics 15, s24 After being pushed in one direction, the average momentum of   a Bose-Einstein condensate is seen to slow and return to ...
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Deep Neural   Network to Find Hidden Turbulent Motion on the Sun
The Sun is important to the Sustainable Development Goal of   Affordable and Clean Energy, both as the source of solar power and as a   natural example of fusion energy. Our understanding of the Sun is li...
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Nanoscale   Computer Operates at the Speed of Light
Synopsis Nanoscale Computer Operates at the Speed of Light   February 18, 2022• Physics 15, s23 Predictions indicate that a   nanometer-sized wave-based computer could solve equations in a fraction of   th...
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How Cotton Fibers   Become Yarn
FOCUS How Cotton Fibers Become Yarn February 18, 2022• Physics   15, 27 Experiments unravel the mysterious twisting process by which short   fibers bind together into yarn. J. Crassous/Univ. of Rennes A...
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Error Mitigation   Approach Helps Quantum Computers Level Up
The research team describes this work in a paper published in   Physical Review Letters, "Mitigating Depolarizing Noise on Quantum   Computers with Noise-Estimation Circuits." "Quantum computers have   the ...
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Planets Born from   Dying Stars
Research News Planets Born from Dying Stars February 17, 2022•   Physics 15, 26 One explanation of a new analysis of dying binary-star systems   is that planets might be forming in the “ashes” of stars...
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非平衡态光致电声耦合增强的动力学追踪
固体材料中的电子-声子耦合是凝聚态物理领域的基本问题之一。近年来,随着超快激光技术的快速发展,利用光学手段对电声耦合作用进行调控受到了广泛关注。光调制的电声耦合行为在许多现象中具有重要意义,比如,光...
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Study sheds light   on axion dark matter
Credit: CC0 Public Domain Scientists from Durham University and   Kings College London have presented a theoretical review in a new study   strongly supporting the search for axion dark matter. The ident...
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Physicists   Harness Electrons to Make 'Synthetic Dimensions'
Our spatial sense doesn't extend beyond the familiar three   dimensions, but that doesn't stop scientists from playing with whatever lies   beyond. advertisement Rice University physicists are pushing s...
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Physicists   Observe an Exotic 'Multiferroic' State in an Atomically Thin Material
"Two-dimensional materials are like LEGOs -- you put one on   top of another to make something different from either piece alone,"   says study author Nuh Gedik, professor of physics at MIT. "Now we have   ...
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Sensor   Breakthrough Paves Way for Groundbreaking Map of World Under Earth Surface
University of Birmingham researchers from the UK National   Quantum Technology Hub in Sensors and Timing have reported their achievement   in Nature. It is the first in the world for a quantum gravity gra...
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Evidence for   Exotic Magnetic Phase of Matter
"Broadly speaking, this is a novel type of magnet,"   said Brookhaven Lab physicist Mark Dean, senior author on a paper describing   the research just published in Nature Communications. "Since magnetic   m...
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铜氧化物超导体高压下的超导-绝缘体相变
对固体施加一个压力,晶格常数会变小,由此可增加能带宽度,把一个绝缘体转变为导体。这是高压诱导的绝缘体向导体的转变是固体材料常见的物理现象,称之为Wilson转变。而把一个金属甚至超导体通过压力,在不改变...
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How Fabrics Dry
Synopsis How Fabrics Dry February 17, 2022• Physics 15, s22   Nuclear magnetic resonance spectroscopy helps researchers reveal the   relationship between the bound and vapor states of water in drying tex...
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More accurately   capturing data on crime using surveys
Figure 1. Correlation with the police data by topic and “method”   in the data aggregated for 2015 to 2020. Variables were transformed prior by   adding 1 and taking the log. Credit: DOI: 10.1177/001112...
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EAST冷却塔群、滤波室相控电抗器降噪及安全防护技术评审会召开
2月18日,EAST冷却塔群、滤波室相控电抗器降噪及安全防护技术评审会在等离子体所召开。专家组由来自合肥工业大学、强磁场科学中心、安徽大学、中船第九设计研究院工程有限公司、中海环境科技(上海)股份有限公司的...
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Atomic Clocks   Measure Einstein's General Relativity at Millimeter Scale
The experiments, described in the Feb. 17 issue of Nature,   suggest how to make atomic clocks 50 times more precise than today's best   designs and offer a route to perhaps revealing how relativity and g...
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Extending and   Contracting Cells
Synopsis Extending and Contracting Cells February 15, 2022•   Physics 15, s21 Cell-substrate interactions explain a difference in behavior   between individual cells and tissues on a surface. A. Killeen...
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A Quantized   Surprise from Fermi Surface Topology
Synopsis A Quantized Surprise from Fermi Surface Topology   February 16, 2022• Physics 15, s19 The quantized conductance of a   two-dimensional electron gas can reflect its Fermi surface topology. C. L....
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极端条件合成的多阶钙钛矿新材料及孤对电子构效调控
钙钛矿及其衍生材料中由于存在电荷、自旋、轨道和晶格多重自由度,从而呈现出丰富的物理现象,是物质科学和材料技术的重要载体。其中,在Pb/Bi基钙钛矿材料中,由于Pb2+/Bi3+存在6s2孤对电子,使得含有这些离子的...
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量变导致质变:奇异金属与高温超导的普适物理规律
最近,中国科学院物理研究所/北京凝聚态物理国家研究中心利用材料基因工程“连续组分外延薄膜与匹配的跨尺度表征技术”获得了奇异金属散射(线性电阻斜率A1)与高温超导转变温度(Tc)之间的普适物理规律(A10.5...
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Illuminating   Black Holes through Turbulent Heating
Viewpoint Illuminating Black Holes through Turbulent Heating   Gregory Howes Department of Physics and Astronomy, University of Iowa, Iowa   City, IA, USA February 14, 2022• Physics 15, 20 Predictions in...
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Sneak Preview of   Early Quasar Observations
Research News Sneak Preview of Early Quasar Observations   February 15, 2022• Physics 15, 24 The newly launched James Webb Space   Telescope should be able to see the galaxies that house some of the Univ...
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Graphene and an   Intense Laser Open the Door to the Extreme
It is known that a thinner target is required for higher ion   energy in laser ion acceleration theory. However, it has been difficult to   directly accelerate ions with an extremely thin target regime si...
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Breakthrough   brings a fusion energy device closer to realization
Physicist Emily Paul and Matt Landreman with figures behind   them. Credit: Kiran Sudarsanan Scientists have achieved a remarkable   breakthrough in the conceptual design of twisty stellarators, experimen...
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Examining the   results of new dark matter searches by the PandaX-4T and ADMX collaborations
The ADMX apparatus right after extracting from the magnet bore.   It was cooled by Liquid Nitrogen, so it makes cold mist. The left big black   bag and right big reservoir are the parts of liquid Helium r...
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Maximum Neutrino   Mass Drops Again
Research News Maximum Neutrino Mass Drops Again February 14,   2022• Physics 15, 25 The KATRIN experiment has delivered the best estimate to   date for the maximum mass of a neutrino, finding it to be ov...
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Eccentric   Fractional Skyrmion Discovered in Numerical Simulations of Ultra-Cold   Superfluids
"This may bring about a major change in the long history of   research on skyrmions," states Hiromitsu Takeuchi, lecturer at the   Graduate School of Science and the Nambu Yoichiro Institute of Theoretica...
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Graphene   Spintronics: 1D Contacts Improve Mobility in Nano-Scale Devices
The team -- comprising researchers from the National Graphene   Institute (NGI) led by Dr Ivan Vera Marun, alongside collaborators from Japan   and including students internationally funded by Ecuador and...
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Mapping the   Quantum Future With Smart TV Technology
Scientists have created the first ever 2D map of the Overhauser   field in organic LEDs, shedding light on the challenges we face in designing   accurate quantum-based technologies advertisement Televis...
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High Expectations   for Black Hole Simulations
I want to understand how black holes lose energy.   Radio-telescope images of the black hole in the galaxy M87—the black hole   imaged by the EHT—show that it is emitting a jet of plasma that extends 49...
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Waves in a Solid   Imitate Twisted Light
FOCUS Waves in a Solid Imitate Twisted Light February 11, 2022•   Physics 15, 21 Waves of vibration moving through the walls of a pipe can   carry orbital angular momentum that could be used for several ...
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211家学会联名发布公约抵制学术不端
在2月15日召开的中国科协第十届全国委员会第三次会议上,211家中国科协全国学会联名发布《中国科协全国学会学术出版道德公约》。   《公约》倡议科研人员、期刊编辑和审稿人破除“圈子”文化和利益纽带,加强行为自律...
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2022重大科学问题、工程技术难题等开始征集
中国科协办公厅关于征集2022重大科学问题、工程技术难题和产业技术问题的通知 各全国学会、学会联合体,有关企业科协:   为进一步加强科技前瞻研判,引领原创性科研攻关,推进科技自立自强,中国科协组织动员全国学会...
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Quantum errors   made more tolerable
The experimental chamber in which the experiments of de Neeve   and colleagues were performed. Credit: ETH Zurich/D-PHYS Home group ETH   physicists have modified one of the major schemes for quantum erro...
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Time crystals   that persist indefinitely at room temperature could have applications in   precision timekeeping
Credit: CC0 Public Domain We have all seen crystals, whether a   simple grain of salt or sugar, or an elaborate and beautiful amethyst. These   crystals are made of atoms or molecules repeating in a symme...
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Theory shows   baryogenesis requirement could drive the contribution of primordial black   holes to dark matter
An example of the correlation function between baryon and PBH   densities. Credit: Wu, Pinetti & Silk. While many studies have hinted at   the existence of dark matter, a material that does not absorb, re...
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We're all   radioactive, so let's stop being afraid of it
Drink up: carrot juice contains a small amount of radioactive   potassium. Credit: Africa Studio / shutterstock Many people are frightened of   radiation, thinking of it as an invisible, man-made and dead...
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A new upper limit   on the mass of neutrinos
In a milestone that will bear on future discoveries in nuclear   and particle physics, today an international team including scientists from   MIT announced that they have established a new upper limit on...
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Mathematician   George Lusztig receives Wolf Prize
George Lusztig, the Abdun-Nur Professor of Mathematics at MIT,   has been awarded the prestigious 2022 Wolf Prize in Mathematics for his work   on geometric representation theory and algebraic groups. The...
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Bacteria’s hidden   weapon: toxins locked inside a capsule secured by a cork
Bacteria’s hidden weapon: toxins locked inside a capsule secured   by a cork New insights could help to develop antibacterial and antifungal   applications February 10, 2022 Structural Biology The micro...
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Seagrasses   continue to release methane after their die-off
Seagrasses continue to release methane after their die-off   Methane is formed from seagrass meadows, even decades after the plants died   off February 14, 2022 Climate Ecology (E&C) Seagrass meadows pla...
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十年磨一剑,我院黄光顺教授、鄢文标团队精确测量正负电子湮没中的R值
我院黄光顺教授、鄢文标副教授带领的中国科大北京谱仪(BESIII)R值研究团队,联合中国科学院高能物理研究所胡海明研究员、平荣刚研究员以及德国Mainz大学Achim   Denig教授,利用连续能区2.23-3.67GeV正负电子对撞数据...
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Researchers Use   Supercomputers for Largest-Ever Turbulence Simulations of Its Kind
Due to its complexity, researchers have come to rely on a   combination of experiments, semi-empirical turbulence models, and computer   simulation to advance the field. Supercomputers have played an esse...
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Neutrinos Are   Lighter Than 0.8 Electronvolts
The international KArlsruhe TRItium Neutrino Experiment   (Katrin), located at Karlsruhe Institute of Technology (KIT), has broken an   important "barrier" in neutrino physics which is relevant for both   p...
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首次发现类星体外流在百光年尺度上的加速现象
近日,武汉大学物理科学与技术学院牟国斌研究员与中国科学技术大学天文学系何志成副研究员,王挺贵教授,刘桂琳教授合作,首次观测到类星体高速外流在百光年尺度上的加速现象。相关工作以“Evidence   for quasar fast...
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Cavity   Engineering for Superconductors
Synopsis Cavity Engineering for Superconductors February 10,   2022• Physics 15, s18 Enclosing a cuprate superconductor in a passive   THz-resonant cavity could provide a new route to modifying a superco...
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Race Not Over   Between Classical and Quantum Computers
Research News Race Not Over Between Classical and Quantum   Computers February 10, 2022• Physics 15, 19 A new classical algorithm   reduces—by a factor of one billion—a recent claim of so-called quantu...
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Quest for Quantum   Materials Through Better Measurement of Quantum Entanglement
This pivotal research work has recently been published in   Physical Review Letters. Quantum materials play a vital role in propelling   human advancement. The search for more novel quantum materials with...
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LHAASO最新实验验证爱因斯坦相对论时空对称的正确性
爱因斯坦的相对论认为,宇宙中物质运动最快的速度是光速,这一限制有没有可能被打破?这个问题可以通过洛伦兹对称性的破缺来检验。近日,位于我国四川稻城的高海拔宇宙线实验LHAASO合作组利用其观测的高能伽马射...
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大批振幅张量网络方法模拟量子线路
第一个应用是避免存储整个态矢量而进行全振幅模拟。具体做法为是将末态矢量分成很多个大批振幅的组合,并用大批振幅方法遍历所有的批次。换句话说,末态的希尔伯特空间被划分成了若干个子空间,然后顺序地使用大批振...
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Computational   Modelling Experts Pioneer Pest-Busting Model
A new study, published in Scientific Reports, builds upon   individual-based model (IBM) techniques to explain and predict the formation   of high slug density patches in arable fields. While existing mod...
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Electron   Conspiracy in a Japanese Lattice Pattern: Kagome Metals Baffle Science
Atoms form a kagome pattern A kagome pattern is composed of   three shifted regular triangular lattices. As a result, the kagome lattice is   a regular pattern composed of stars of David. It is a common J...
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Spatial training   of youth with blocks and puzzles could unlock the UK's mathematical potential
Correlation between age (years) and the effects of spatial   training on mathematics outcomes. This is a zero-order correlation between   the average effect size of spatial training on mathematics outcome...
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Extracting the   Spin and Valley Information of Electrons
Synopsis Extracting the Spin and Valley Information of Electrons   February 9, 2022• Physics 15, s17 An electron’s spin and valley information   can be determined by monitoring how easily that electron ...
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Galactic Debris   as a Dark Matter Identifier
Research News Galactic Debris as a Dark Matter Identifier   February 8, 2022• Physics 15, 18 Dynamic maps of 12 stellar streams trace   paths that are determined by the distribution of mass in the Milky ...
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New Plant-Derived   Composite Is Tough as Bone and Hard as Aluminum
A single wood cell wall is constructed from fibers of cellulose   -- nature's most abundant polymer, and the main structural component of all   plants and algae. Within each fiber are reinforcing cellulos...
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Distant Galaxies   and the True Nature of Dark Matter
These important findings have been reported in a new study,   recently published in the prestigious Astronomy and Astrophysics journal,   that studied a large number of distant galaxies, some seven billio...
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Where Mathematics   and a Social Perspective Meet Data
"When we encounter complex data in areas such as public   health, economics or elsewhere, it can be valuable to address questions   regarding the presence of discernable groups, and the inherent   "cohesion...
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Einstein's   Photoelectric Effect: The Time It Takes for an Electron to Be Released
It is now one hundred years ago that Albert Einstein was awarded   the Nobel Prize in Physics for his work on the photoelectric effect. The jury   had not yet really understood his revolutionary theory of...
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Spatial Training   With Blocks and Puzzles Could Unlock the UK's Mathematical Potential
Spatial training with blocks and puzzles could unlock   mathematical potential. A sustained focus on spatial reasoning training could   help children learn science, technology, engineering and mathematics...
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Researchers   Develop Methodology for Streamlined Control of Material Deformation
Can you crumple up two sheets of paper the exact same way?   Probably not -- the very flexibility that lets flexible structures from paper   to biopolymers and membranes undergo many types of large deform...
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“Tin-Can   Telephone” Connects Two Ions
Viewpoint “Tin-Can Telephone” Connects Two Ions Christian Tomás   Schmiegelow Department of Physics, FCEyN, University of Buenos Aires and the   Institute of Physics of Buenos Aires - CONICET, Buenos A...
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A Plasma Lens for   the World’s Most Powerful Lasers
Synopsis A Plasma Lens for the World’s Most Powerful Lasers   February 8, 2022• Physics 15, s16 Researchers propose inducing density   variations in a plasma to create a lens that can focus a petawatt-s...
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Future   Gravitational Wave Detector in Space Could Uncover Secrets of the Universe
New research has shown that future gravitational wave detections   from space will be capable of finding new fundamental fields and potentially   shed new light on unexplained aspects of the Universe. adv...
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Toward Triggering   Room-Temperature Superconductivity With Light
In the case of a superconducting material known as yttrium   barium copper oxide, or YBCO, experiments have shown that under certain   conditions, knocking it out of equilibrium with a laser pulse allows ...
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New Insight Into   Unconventional Superconductivity
The kagome pattern, a network of corner-sharing triangles, is   well known amongst traditional Japanese basket weavers -- and condensed   matter physicists. The unusual geometry of metal atoms in the kago...
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Speed Limit on   Change
FOCUS Speed Limit on Change February 4, 2022• Physics 15, 17   Experiments with a single calcium atom prove that processes of change have a   speed limit determined by the rate at which they can dissipat...
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Mutating Quantum   Particles Set in Motion
Researchers from the Cavendish Laboratory have modelled a   quantum walk of identical particles that can change their fundamental   character by simply hopping across a domain wall in a one-dimensional la...
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Tiny Electrical   Vortexes Bridge Gap Between Ferroelectric and Ferromagnetic Materials
Ferromagnetic materials have a self-generating magnetic field,   ferroelectric materials generate their own electrical field. Although   electric and magnetic fields are related, physics tells us that the...
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New Findings   Proliferate Questions About Hypothetical Axionic Behavior in Weyl Semimetals
Date: February 8, 2022 Source: American Institute of Physics   Summary: Researchers say an experimental approach for demonstrating the   existence of an axionic behavior in specific materials may not have...
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Blowin’ in the   Galactic Wind
Research News Blowin’ in the Galactic Wind February 3, 2022•   Physics 15, 15 Nuclear winds expel cold molecular hydrogen gas from the   Galactic Center, providing new clues to how star-forming material...
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Quantum   Measurement Strikes a Balance
Synopsis Quantum Measurement Strikes a Balance February 3, 2022•   Physics 15, s13 An experiment demonstrates that, in a quantum measurement,   there is a three-way trade-off between different types of i...
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New discovery may   revolutionize decades-old understanding of integrable hierarchies
Figure 1. The main theorem describes the relationship between   solutions of the KdV and BKP hierarchies. The tau functions can be identified   after a simple change of variables. Credit: Institute for Ba...
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Using the   Universe’s Coldest Material to Measure the World’s Tiniest Magnetic Fields
Some magnetic fields of great interest, for example those   produced by the brain, are extraordinarily weak, a billion times weaker than   the field of the Earth, and therefore, extremely sensitive magnet...
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科学家首测费米超流第二声
科学家首测费米超流第二声   中国科学技术大学潘建伟、姚星灿、陈宇翱等与澳大利亚科学家胡辉合作,首次在处于强相互作用(幺正)极限下的费米超流体中观测到熵波衰减的临界发散行为,揭示该体系存在着一个可观的相变...
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黄华卿课题组与合作者揭示结构非晶化诱导的拓扑态
晶体中的电子性质通常与结构对称性有着重要关联,因而非晶化导致的晶体结构对称性降低或破坏会损害电子性质。对于拓扑材料而言,尽管晶体中的拓扑态对无序扰动具有很强的鲁棒性,但随着结构无序程度的增强,其电子能...
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Mechanical   control of a reconfigurable intelligent surface
Schematic views of the RIS supercell and the meta-atom. Right:   Geometric phase control in each supercell is achieved by transmitting the   torque from a stepping motor to the meta-atoms through a set of...
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Using radar to   monitor burn victims and babies? It's now possible
PhD candidate Ziqian Zhang and Professor Benjamin Eggleton   optimising the photonic system – the basis of the high frequency radar.   Credit: University of Sydney University of Sydney scientists have ac...
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Researchers shed   light on role of kinetics in fluid transport
Credit: Pixabay/CC0 Public Domain Remco Hartkamp, Max Döpke and   Fenna Westerbaan van der Meij, researchers at the Delft University of   Technology department Process & Energy, are shedding new light on...
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Researchers use   tiny magnetic swirls to generate true random numbers
Magnetic swirls called skyrmions fluctuate randomly in size, a   behavior that can be harnessed to generate true random numbers. Credit: Xiao   lab / Brown University Whether for use in cybersecurity, gam...
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The high-speed   physics of how bobsled, luge and skeleton send humans hurtling faster than a   car on the highway
Skeleton racers don’t have a means of directly controlling the   runners, so they must use subtle body movements to flex the sled and initiate   turns. Credit: 121a0012 via Wikimedia Commons, CC BY-SA Sp...
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3D-Printed   Magnets Made from Recycled Materials
Research News 3D-Printed Magnets Made from Recycled Materials   February 2, 2022• Physics 15, 14 Using recycled materials to make magnets   could allow companies to circumvent supply chain issues for sou...
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Teams collaborate   to reach a better understanding of symmetry breaking
A laser beam illuminates two identical coupled optical cavities   symmetrically. The cavities are the grey areas with missing holes and   enclosed by red holes. Above a critical light intensity, a tiny pe...
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Supercomputer and   quantum simulations solve a difficult problem of materials science
A global team of scientists considered the bending energy of a   silicate molecule, disiloxane. Although the system appears to be simple and   tractable, the bending energy calculation is actually a diffi...
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A mathematical   model may help explain how blood circulates in the brain
Travelling waves in a non-linear flow network. Each panel   displays different time frames. The network is represented by black lines   while the colour around each node indicates the volume that has accu...
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