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单元素类石墨烯二维拓扑材料的研究进展
二维材料 量子自旋霍尔效应 类石墨烯 自旋轨道耦合
2019/4/12
除了石墨烯外，很多主族元素也可以形成类似石墨烯的稳定单层结构，并且具有丰富的物理化学性质及广阔的应用前景。其中在物理学中最引人注目的是理论预言在这些材料中预言存在的二维拓扑物性。单元素类石墨烯二维材料已经经历了十余年的研究进程，目前已经理论发现和实验制备出了若干新型二维拓扑材料，成为当前凝聚态物理和新材料领域重要研究方向之一。在这篇评述中，我们将详细介绍这一领域的研究历程、研究思路，以及最新研究进...
二维α-In2Se3的铁电性与器件应用
二维铁电 二维材料 α-In2Se3 铁电器件
2018/10/22
铁电体具有可控的非易失电极化，在现代电子学中有着广泛的应用，例如大容量电容器、新型二极管、铁电场效应晶体管、铁电隧道结等．伴随着电子元器件的不断微型化，传统铁电体面临着极大的挑战，即在器件减薄过程中受限于临界尺寸效应，铁电性很难稳定存在于纳米乃至单原子层二维极限厚度下．鉴于二维范德华材料具有界面饱和、层间相互作用弱、易于实现二维极限厚度等特性，因此，在二维材料家族中寻找室温二维铁电性将是解决传统铁...
Sub-linear radiation power dependence of photo-excited resistance oscillations in two-dimensional electron systems
Sub-linear radiation power dependence two-dimensional electron systems
2010/11/25
We find that the amplitude of the Rxx radiation-induced magnetoresistance oscillations in
GaAs/AlGaAs system grows nonlinearly as A / P where A is the amplitude and the exponent
< 1. This strikin...
Homogeneous populations of oscillators have recently been shown to exhibit stable coexistence
of coherent and incoherent regions. Generalizing the concept of chimera states to the context of order-di...
Asymptotic analysis of stresses near a crack tip in a two dimensional colloidal packing saturated with liquid
Asymptotic analysis of stresses two dimensional colloidal
2010/11/23
The consolidation of colloidal particles in drying colloidal dispersions is in-uenced by various factors such as particle size and shape, and inter-particle potential. The capillary pressure induced b...
Atomistic theory of spin relaxation in self-assembled In$_{1-x}$Ga$_x$As/GaAs quantum dots at zero magnetic field
Atomistic theory spin relaxation zero magnetic field
2010/11/23
We present full atomistic calculations of the spin-flip time (T1) of electrons and holes mediated by acoustic phonons in self-assembled In1−xGaxAs/GaAs quantum dots at zero magnetic field. At lo...
An One Dimensional Adiabatic Model for Fusion Involving Loosely Bound and Halo Nuclei with Heavy Targets
One Dimensional Adiabatic Model Fusion Involving Loosely Bound Halo Nuclei Heavy Targets
2010/11/23
An one dimensional adiabatic model has been proposed for fusion of loosely bound and halo light
nuclei with various heavy targets. It is shown that fusion cross sections at near and sub-barrier energ...
Robust Level Coincidences in the Subband Structure of Quasi 2D Systems
Robust Level Coincidences Subband Structure of Quasi 2D Systems
2010/11/22
Recently, level crossings in the energy bands of crystals have been identified as a key signature for topological phase transitions. In general, three independent parameters must be tuned appropriatel...
Spin canting as a result of the competition between stripes and spirals in cuprates
Spin canting spirals in cuprates
2010/11/22
Based on the extended Hubbard model we calculate the energy of stripe and spiral ground states.
We find that uniform spirals get favored by a large t′/t ratio but are unstable at small doping towards...
We investigate the constraints on the superfluid fraction of an amorphous solid following from
an upper bound derived by Leggett. In order to accomplish this, we use as input density profiles generat...
We investigate the effects of a trapping space-dependent potential on the low-temperature quasilong-range order phase of two-dimensional particle systems with a relevant U(1) symmetry, such as quantum...
Grey solitons in a strongly interacting superfluid Fermi Gas
Grey solitons strongly interacting superfluid Fermi Gas
2010/11/19
The Bardeen-Cooper-Schrieffer to Bose-Einstein condensate (BCS to BEC) crossover problem is
solved for stationary grey solitons via the Boguliubov-de Gennes equations at zero temperature.
These cros...
On a microcanonical relation between continuous and discrete spin models
microcanonical relation ontinuous discrete spin models
2010/11/19
A relation between a class of stationary points of the energy landscape of continuous spin mod-
els on a lattice and the configurations of a Ising model defined on the same lattice suggests an approx...
Lifshitz transition in two-dimensional spin-density wave models
Lifshitz transition two-dimensional spin-density wave models
2010/11/18
We argue that both pocket-disappearing and neck-disrupting types of Lifshitz transitions can be
realized in two-dimensional spin-density wave models for underdoped cuprates, and study both
types of ...
Striking Roles for Spin Degrees of Freedom in the Second Landau Level
Spin Degrees Second Landau Level
2010/11/18
The spin degree of freedom in quantum phases of the second Landau level is probed by resonant light scattering.The long wavelength spin wave mode, which monitors the degree of spin polarization, is at...