哈伯德模型与石墨烯的绝对负电导率

First and second-order metal-insulator phase transitions and topological aspects of a Hubbard-Rashba system

This paper considers a model consisting of a kinetic term, Rashba spin-orbit coupling and short-range Coulomb interaction at zero-temperature. The Coulomb interaction is decoupled by a mean-field approximation in the spin channel using field theory methods. The results feature a first-order phase transition for any finite value of the chemical potential and quantum criticality for vanishing chemical potential. The Hall conductivity is also computed using Kubo formula in a mean-field effective Hamiltonian. In the limit of infinite mass the kinetic term vanishes and all the phase transitions are…

Negative absolute conductivity in photoexcited metals

We show that in a model of a metal photoexcited by a transient pump pulse resonant with a phonon mode the absolute dc conductivity may become negative, depending on the interplay between the electronic structure, the phonon frequency and the pump intensity. The analysis includes the effects of inelastic scattering and thermal relaxation. Results for the time evolution of the negative conductivity state are presented; the associated non-equilibrium physics may persist for long times after the pulse. Our findings provide a theoretical justification for previously proposed phenomenology and indic…

二维电子系统中与微波声散射相关的绝对负电导

Absolute Negative Conductivity in Two-Dimensional Electron Systems Associated with Acoustic Scattering Stimulated by Microwave Radiation

讨论了在横向磁场中微波辐射激励的二维电子系统（2DES）中产生绝对负电导（ANC）的可能性。ANC的机理与电子在声压电声子上的散射和微波光子的吸收有关。它表明，2DES直流电导率的耗散组件可以是负的（$σ_{xx} = σ_{yy} < 0$）时，微波频率$Ω$是略高于电子回旋频率$Ω_c$或其谐波。ANC的概念与这样一个散射机制可以调用来解释在最近的实验中观察到的零电阻“无耗散”状态的发生的性质。

Mott-Hubbard绝缘体的粒子-空穴对称性和无序效应

Particle-Hole Symmetry and the Effect of Disorder on the Mott-Hubbard Insulator

最近的实验强调，我们对固体中电子相关性和随机性的相互作用的理解仍然是不完整的。我们解决这个重要的问题，并证明粒子-空穴（ph）对称性起着至关重要的作用，在确定的影响，无序的运输和热力学性质的半满哈伯德哈密顿。我们发现，低温电导率随无序度的增加而降低时，保持pH对称性，并显示相反的行为，即电导率随无序度的增加，当pH对称性被打破。莫特绝缘间隙是不敏感的弱无序时，有PH对称性，而在其情况下，间隙随无序度的增加而减小。

非量子化电场和磁场下具有非谐色散律的二维超晶格电导率振荡

Conductivity oscillations in 2D superlattice with non-harmonical dispersion law under non-quantizing electric and magnetic fields (in Russian)

本文计算了在非量子化电场和磁场交叉作用下抛物型能带半导体超晶格中的电流密度。被认为是Corbino磁盘的几何形状。电流-电压曲线包含周期与磁场成比例的振荡。指出了负绝对电导率的可能性。在足够高的电场下，安培-高斯特性也包含过冲。在所有情况下，峰随着温度升高而模糊。

面向先进技术晶体管的尺寸相关有效热导率的从头计算数据集

An ab initio dataset of size-dependent effective thermal conductivity for advanced technology transistors

本文基于从头计算提取电子和声子性质，构建了12种半导体及金属材料在5-50纳米特征长度下的尺寸相关有效热导率数据集，为先进晶体管热仿真提供更精确的数据支持。