Fermi-edge resonance and tunneling in nonequilibrium electron gas.
Fermi-edge resonance and tunneling in nonequilibrium electron gas.
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非平衡电子气中的费米边共振和隧道效应。
DOI：
10.1103/physrevlett.94.186803
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发表时间：
2004
影响因子：
8.6
通讯作者：
L. Levitov
中科院分区：
文献类型：
--
作者：
D. Abanin;L. Levitov
费米边奇异性在非平衡系统中发生变化，获得反映能量分布结构的特征。特别地，如果能量分布呈现多个步骤，则它分裂成几个分量。虽然传统的方法，如玻色化，不能描述的非平衡问题，一个通用的能量分布的精确解可以得到的帮助下，方法的功能决定因素。在分裂费米分布的情况下，格林函数的“开环”部分具有幂律奇点。同时，所得到的隧穿态密度表现出以费米次能级为中心的加宽峰。
Fermi-edge singularity changes in a nonequilibrium system, acquiring features that reflect the structure of energy distribution. In particular, it splits into several components if the energy distribution exhibits multiple steps. While conventional approaches, such as bosonization, fail to describe the nonequilibrium problem, an exact solution for a generic energy distribution can be obtained with the help of the method of functional determinants. In the case of a split Fermi distribution, the "open loop" part of the Greens function possesses power law singularities. At the same time, the resulting tunneling density of states exhibits broadened peaks centered at Fermi sublevels.