论文标题
旋转和山谷大厅的效应由不对称的颗粒散射引起
Spin and Valley Hall effects induced by asymmetric interparticle scattering
论文作者
论文摘要
我们在不对称的 - 偏斜散射引起的二维系统中发展了自旋和山谷霍尔效应的理论。碰撞积分在粒子粒子相互作用中以三阶得出，并考虑了玻色子和费米子的自旋轨道耦合。结果表明，散射不对称仅出现在存在初始状态和中间状态下粒子之间相互作用之间的过程中。我们表明，对于退化电子或非成型颗粒，粒子间碰撞引起的自旋和山谷电流分别与平方温度或密度成正比的稳态值抑制。我们的结果意味着在存在电子电子偏斜散射的情况下，电子的非Fermi液体性质。还证明了二维退化玻色子的偏斜散射，例如激子或激子极化子：退化玻色子的自旋或山谷电流包含增强因子，随着颗粒密度的增加而成倍增长。
We develop the theory of the spin and valley Hall effects in two-dimensional systems caused by asymmetric -- skew -- scattering of the quasiparticles. The collision integral is derived in the third order in the particle-particle interaction with account for the spin-orbit coupling both for bosons and fermions. It is shown that the scattering asymmetry appears only in the processes where the interaction between the particles in the initial and intermediate state is present. We show that for degenerate electrons or nondegenerate particles the spin and valley currents induced by interparticle collisions are suppressed with their steady-state values being proportional to the squared temperature or density, respectively. Our results imply non-Fermi liquid properties of electrons in the presence of electron-electron skew scattering. Strong deviations from conventional picture of interparticle scattering are also demonstrated for the skew scattering of two-dimensional degenerate bosons, e.g. excitons or exciton polaritons: The spin or valley current of degenerate bosons contains the enhancement factor exponentially growing with increase in the particle density.
