标题： 临界费米面的通用变形通道，包括碰撞的影响 显示英文标题

标题： Generic deformation channels for critical Fermi surfaces including the impact of collisions

摘要： 本文是我们在确定量子临界金属费米面的一般低能变形性质方面的后续研究，这种性质出现在量子相变的稳定非费米液体（NFL）不动点处。 在伊辛-向列序量子临界点（QCP）处出现的新兴临界费米面，是强相互作用导致费米子自由度与玻色序参量自由度表现出非费米液体行为的一个典型例子。 这是玻色模式在QCP处变得无质量的结果，从而在一环自能级上经历朗道阻尼。 我们采用经过充分验证的量子玻尔兹曼方程（QBEs）形式主义来识别激发。 在我们之前的工作中，我们通过忽略碰撞积分并假设玻色子处于平衡状态，专注于无碰撞区域。在这里，我们进行了全面分析。 特别是，我们考虑了QBEs中的玻色子部分。 最终结果显示，这些新兴模式是长寿命且对由碰撞积分带来的阻尼效应具有鲁棒性的，并表现出与无碰撞近似下获得的相同定性特征。 显示英文摘要

摘要： This paper constitutes a sequel to our theoretical efforts to determine the nature of the generic low-energy deformations of the Fermi surface of a quantum-critical metal, which arises at the stable non-Fermi liquid (NFL) fixed point of a quantum phase transition. The emergent critical Fermi surface, arising right at the Ising-nematic quantum critical point (QCP), is a paradigmatic example where an NFL behaviour is induced by the strong interactions of the fermionic degrees of freedom with those of the bosonic order parameter. It is an artifact of the bosonic modes becoming massless at the QCP, thus undergoing Landau damping at the level of one-loop self-energy. We resort to the well-tested formalism of the quantum Boltzmann equations (QBEs)for identifying the excitations. While in our earlier works, we have focussed on the collisionless regime by neglecting the collision integral and assuming the bosons to be in equilibrium, here we embark on a full analysis. In particular, we take into account the bosonic part of the QBEs. The final results show that that the emergent modes are long-lived and robust against the damping effects brought about the collision integral(s), exhibiting the same qualitative features as obtained from the no-collision approximations.