Nonequilibrium Kondo regime current noise spectrum of quantum dot systems with the single impurity Anderson model

Hong Mao; Jinshuang Jin; Shikuan Wang; YiJing Yan

doi:10.1063/5.0045346

Nonequilibrium Kondo regime current noise spectrum of quantum dot systems with the single impurity Anderson model

J Chem Phys. 2021 Jul 7;155(1):014104. doi: 10.1063/5.0045346.

Authors

Hong Mao¹, Jinshuang Jin¹, Shikuan Wang², YiJing Yan³

Affiliations

¹ Department of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China.
² Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China.
³ Hefei National Laboratory for Physical Sciences at the Microscale & i ChEM, University of Science and Technology of China, Hefei, Anhui 230026, China.

PMID: 34241380
DOI: 10.1063/5.0045346

Abstract

We investigate the nonequilibrium current noise spectrum of single impurity Anderson model quantum dot systems on the basis of the accurate dissipation equation of motion evaluations. By comparing between the equilibrium and nonequilibrium cases and between the non-Kondo and Kondo regimes, we identify the current noise spectrum of the nonequilibrium Kondo features that actually appear in the entire region of ω ∈ [-eV, eV]. It is well known that the primary Kondo characteristics at ω = ±eV = ±(μ_L - μ_R) display asymmetrical upturns and remarkable peaks in S(ω) and dS(ω)/dω, respectively. These features are originated from the Rabi interference of the transport current dynamics, with the Kondo oscillation frequency of |eV|. Moreover, we also identify the minor but very distinguishable inflections, crossing over from ω = -eV to ω = +eV. This uncovered feature would be related to the interference between two Kondo resonance channels.