论文标题
无碰撞旋转阻力的线性响应研究
Linear response study of collisionless spin drag
论文作者
论文摘要
在这项工作中，我们关注的是对当前响应函数的两个超流体之间的无碰撞阻力或夹带，也称为Andreev-Bashkin效应。阻力密度与横横电流 - 电流响应函数成正比，在单个物种超流体密度中起正常成分的作用。我们可以通过这种方式将有限夹带的存在与旋转通道中的能量加权总规则的精疲力尽联系起来。然后，形式主义用于重现一些已知的结果，以造成弱相互作用的玻色液混合物。最后，我们包括阻力效应，以确定在声速和旋转偶极激发速度上的超平均校正，分别为均匀和捕获的气体。
In this work we are concerned with the understanding of the collisionless drag or entrainment between two superfluids, also called Andreev-Bashkin effect, in terms of current response functions. The drag density is shown to be proportional to the cross transverse current-current response function, playing the role of a normal component for the single species superfluid density. We can in this way link the existence of finite entrainment with the exhaustion of the energy-weighted sum rule in the spin channel. The formalism is then used to reproduce some known results for a weakly interacting Bose-Bose mixture. Finally we include the drag effect to determine the beyond mean-field correction on the speed of sound and on the spin dipole excitations for a homogeneous and trapped gas, respectively.
