Time-dependent transport through quantum-impurity systems with Kondo resonance
We investigate the time-dependent transport properties of single and double quantum-impurity systems based on the hierarchical equations of motion (HEOM) approach. In the Kondo regime, the dynamical current oscillates with time in both cases due to the temporal coherence of electrons tunneling throu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/3/033009 |
| _version_ | 1797751155023937536 |
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| author | YongXi Cheng WenJie Hou YuanDong Wang ZhenHua Li JianHua Wei YiJing Yan |
| author_facet | YongXi Cheng WenJie Hou YuanDong Wang ZhenHua Li JianHua Wei YiJing Yan |
| author_sort | YongXi Cheng |
| collection | DOAJ |
| description | We investigate the time-dependent transport properties of single and double quantum-impurity systems based on the hierarchical equations of motion (HEOM) approach. In the Kondo regime, the dynamical current oscillates with time in both cases due to the temporal coherence of electrons tunneling through the device, which shares the same mechanism as the single-level resonance without e–e interactions, but shows some different characteristics. For single quantum-impurity systems, the temperature T has an inhibitory effect on the oscillations of dynamic current through its suppression of the Kondo effects. The amplitude of the current oscillations is attenuated by the e–e interaction U in the Kondo regime. The frequency of the current oscillations is found almost independent of T and U . For parallel-coupling double quantum-impurity systems, the oscillation of the current shows similar behavior to the single one, but with two-to-three times larger amplitudes. At the limit of small inter-impurity coupling the oscillation of the current exhibits enhanced characters, while it is weakened at the other limit. |
| first_indexed | 2024-03-12T16:43:22Z |
| format | Article |
| id | doaj.art-46ae1854033d4d34946f57c18eaf6f56 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:43:22Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-46ae1854033d4d34946f57c18eaf6f562023-08-08T14:20:05ZengIOP PublishingNew Journal of Physics1367-26302015-01-0117303300910.1088/1367-2630/17/3/033009Time-dependent transport through quantum-impurity systems with Kondo resonanceYongXi Cheng0WenJie Hou1YuanDong Wang2ZhenHua Li3JianHua Wei4YiJing Yan5Department of Physics, Renmin University of China , Beijing 100872, People's Republic of ChinaDepartment of Physics, Renmin University of China , Beijing 100872, People's Republic of ChinaDepartment of Physics, Renmin University of China , Beijing 100872, People's Republic of ChinaDepartment of Physics, Renmin University of China , Beijing 100872, People's Republic of China; Beijing Computational Science Research Center, Beijing 100084, People's Republic of ChinaDepartment of Physics, Renmin University of China , Beijing 100872, People's Republic of ChinaHefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China; Department of Chemistry, Hong Kong University of Science and Technology , Kowloon, Hong KongWe investigate the time-dependent transport properties of single and double quantum-impurity systems based on the hierarchical equations of motion (HEOM) approach. In the Kondo regime, the dynamical current oscillates with time in both cases due to the temporal coherence of electrons tunneling through the device, which shares the same mechanism as the single-level resonance without e–e interactions, but shows some different characteristics. For single quantum-impurity systems, the temperature T has an inhibitory effect on the oscillations of dynamic current through its suppression of the Kondo effects. The amplitude of the current oscillations is attenuated by the e–e interaction U in the Kondo regime. The frequency of the current oscillations is found almost independent of T and U . For parallel-coupling double quantum-impurity systems, the oscillation of the current shows similar behavior to the single one, but with two-to-three times larger amplitudes. At the limit of small inter-impurity coupling the oscillation of the current exhibits enhanced characters, while it is weakened at the other limit.https://doi.org/10.1088/1367-2630/17/3/033009time-dependent transportKondo resonancehierarchical equations of motionquantum-impurity systems71.27.+a72.15.Qm |
| spellingShingle | YongXi Cheng WenJie Hou YuanDong Wang ZhenHua Li JianHua Wei YiJing Yan Time-dependent transport through quantum-impurity systems with Kondo resonance New Journal of Physics time-dependent transport Kondo resonance hierarchical equations of motion quantum-impurity systems 71.27.+a 72.15.Qm |
| title | Time-dependent transport through quantum-impurity systems with Kondo resonance |
| title_full | Time-dependent transport through quantum-impurity systems with Kondo resonance |
| title_fullStr | Time-dependent transport through quantum-impurity systems with Kondo resonance |
| title_full_unstemmed | Time-dependent transport through quantum-impurity systems with Kondo resonance |
| title_short | Time-dependent transport through quantum-impurity systems with Kondo resonance |
| title_sort | time dependent transport through quantum impurity systems with kondo resonance |
| topic | time-dependent transport Kondo resonance hierarchical equations of motion quantum-impurity systems 71.27.+a 72.15.Qm |
| url | https://doi.org/10.1088/1367-2630/17/3/033009 |
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