论文标题
电子 - 玻色互相互作用诱导的颗粒 - 孔对称性破坏电导到超导体中的子段状态
Electron-boson-interaction induced particle-hole symmetry breaking of conductance into subgap states in superconductors
论文作者
论文摘要
超导体中亚段状态的电导粒子对称性（pHS）是非互动超导性平均场理论的基本结果。该pHS的破裂归因于一种非互操机制，即准粒子中毒（QP），这是对基于超导体的Qubits相干性有害的过程。我们使用速率方程式和Keldysh形式主义研究了这种耦合对超导体子段电导pHS的影响，这些形式主义具有不同的有效性。在这两个方案中，我们都发现，这种耦合在子段电导中产生了粒子孔$不对称$，该耦合随着耦合强度的提高而增加，增加了子段 - 状态粒子孔含量含量不平衡和降低温度。我们提出的机制是一般的，即使适用于不能归因于QP的子仪传导pHS破裂的实验。
Particle-hole symmetry (PHS) of conductance into subgap states in superconductors is a fundamental consequence of a noninteracting mean-field theory of superconductivity. The breaking of this PHS has been attributed to a noninteracting mechanism, i.e., quasiparticle poisoning (QP), a process detrimental to the coherence of superconductor-based qubits.Here, we show that the ubiquitous electron-boson interactions in superconductors can also break the PHS of subgap conductances. We study the effect of such couplings on the PHS of subgap conductances in superconductors using both the rate equation and Keldysh formalism, which have different regimes of validity. In both regimes, we found that such couplings give rise to a particle-hole $asymmetry$ in subgap conductances which increases with increasing coupling strength, increasing subgap-state particle-hole content imbalance and decreasing temperature. Our proposed mechanism is general and applies even for experiments where the subgap-conductance PHS breaking cannot be attributed to QP.
