Mechanism of current noise spectrum in a nonequilibirum Kondo dot system
Fuente:
arXiv
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2020
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911922596610048 |
|---|---|
| author | Mao, Hong Jin, Jinshuang Wang, Shikuan Yan, YiJing |
| author_facet | Mao, Hong Jin, Jinshuang Wang, Shikuan Yan, YiJing |
| contents | We systematically study the nonequilibirum Kondo mechanisms of quantum noise spectrum based on the accurate dissipaton--equation--of--motion evaluations. By comparing the noise spectra between the equilibrium and nonequilibrium cases and between the non-Kondo and Kondo regimes, we identify the nonequilibrium Kondo features in the current noise spectrum, appearing in the region of $ω\in [-eV, eV]$. The Kondo characteristic at $ω=\pm eV=\pm (μ_{\rm L}-μ_{\rm R})$ 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 $|eV|$. The minor but very distinguishable inflections, crossing over $ω=-eV$ to $ω=+eV$, would be related to a sort of Kondo-Fano interference between two Kondo resonances channels. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2012_14102 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Mechanism of current noise spectrum in a nonequilibirum Kondo dot system Mao, Hong Jin, Jinshuang Wang, Shikuan Yan, YiJing Mesoscale and Nanoscale Physics We systematically study the nonequilibirum Kondo mechanisms of quantum noise spectrum based on the accurate dissipaton--equation--of--motion evaluations. By comparing the noise spectra between the equilibrium and nonequilibrium cases and between the non-Kondo and Kondo regimes, we identify the nonequilibrium Kondo features in the current noise spectrum, appearing in the region of $ω\in [-eV, eV]$. The Kondo characteristic at $ω=\pm eV=\pm (μ_{\rm L}-μ_{\rm R})$ 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 $|eV|$. The minor but very distinguishable inflections, crossing over $ω=-eV$ to $ω=+eV$, would be related to a sort of Kondo-Fano interference between two Kondo resonances channels. |
| title | Mechanism of current noise spectrum in a nonequilibirum Kondo dot system |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2012.14102 |