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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Random phase approximation for the mean-field electron gas （3）
平均场 电子气 随机相位近似
2023/11/24
Random phase approximation (RPA) was proposed by Bohm and Pines in four seminal papers during 1951-1953 to describe the correlation of fermions, namely the correction to the Hartree-Fock theory. While...
The way electrons interact with photons of light is a key part of many modern technologies, from lasers to solar panels to LEDs. But the interaction is inherently a weak one because of a major mismatc...
The mysterious changes in phases of matter – from solid to liquid and back again – have fascinated Eun-Ah Kim since she was in lower elementary school in South Korea. Without cold drinking water readi...
An LHC quadrupole whose beam screen had been coated with a fine layer of carbon displayed minimal heat load in comparison to other magnets, constituting a promising step in eliminating electron clouds...
Though they are discrete particles, water molecules flow collectively as liquids, producing streams, waves, whirlpools, and other classic fluid phenomena.
Not so with electricity. While an electric c...
Holding the right material at the right angle, Cornell researchers have discovered a strategy to switch the magnetization in thin layers of a ferromagnet – a technique that could eventually lead to th...
Physicists find direct evidence of strong electron correlation in a 2D material for the first time（图）
二维材料 强电子 相关性 非常规超导性
2022/3/17
In recent years, physicists have discovered materials that are able to switch their electrical character from a metal to an insulator, and even to a superconductor, which is a material in a friction-f...
MIT.nano receives grant to acquire focused ion beam scanning electron microscope（图）
聚焦离子束 扫描电子显微镜 双束纳米制造平台
2022/2/9
The VELION FIB-SEM, a next-generation dual-beam nanofabrication platform located in MIT.nano, will become a permanent part of the facility’s characterization capabilities, thanks in part to a Major Re...
When scientists needed to visualize the structure of the spike protein, which coronaviruses use to infiltrate human cells, they turned to cryo-electron microscopy. One of the most powerful imaging too...
In 2016, physicist J.C. Séamus Davis discovered an elusive state of quantum matter in the cuprates, which are copper oxide materials laced with other atoms. That launched a new sub-field in the study ...
4 April 2007,The strong electric field from an intense laser pulse can cause electrons to "tunnel" away from an atom in just one billion-billionth of a second. Now physicists in Germany are the first ...
Electron storage added to molecular package that converts light to chemical energy
Electron molecular complexes hydrogen
2007/3/29
Blacksburg, Va., March 28, 2007，The Virginia Tech chemistry research group that has been creating molecular complexes that use solar energy to produce hydrogen from water has added an additional capac...
24 January 2007，While physicists have exploited the thermal properties of magnetic nuclei to reach temperatures as low as 100 pK, these techniques are not suitable for cooling relatively large structu...
Researchers Observe Superradiance in a Free Electron Laser
Superradiance Free Electron molecules atoms
2007/1/30
January 19, 2007，UPTON, NY - At the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory, a team of researchers has generated extremely short light pulses using a new technique that could ...
Creating monoenergetic electron beams on a tabletop（图）
monoenergetic electron beams tabletop plasma wakefields
2006/12/19
13 December 2006，High-energy particles are mostly produced in vast conventional accelerators such as the 6.3-km-circumference Tevatron in the US. But while these costly edifices have undoubtedly led t...