金属中两能级系统处于双通道Kondo区的退相干
强关联电子
2009-10-31 v2 介观与纳米尺度物理
摘要
我们指出金属体系中传导电子退相干率1/\tau_\phi \equiv \gamma_\phi的一个新的非普适贡献:来自具有近简并Kondo基态的非磁两能级系统(TLSs)的散射。在\Delta_{ren} < T < T_K区(\Delta_{ren}=重整化能级分裂,T_K=Kondo温度),此类TLSs展现非费米液体物理,可使通常随T降低而减小的\gamma_\phi在T→0前于有限温度范围内看似饱和而后消失。这可解释近期在金线中观测到的退相干饱和[Mohanty et al. Phys. Rev. Lett. 78, 3366 (1997)]。
引用
@article{arxiv.cond-mat/9902176,
title = {Dephasing in Metals by Two-Level Systems in the 2-Channel-Kondo Regime},
author = {A. Zawadowski and Jan von Delft and D. C. Ralph},
journal= {arXiv preprint arXiv:cond-mat/9902176},
year = {2009}
}
备注
Final published version, including minor improvements suggested by referees. 4 pages, Revtex, 1 figure