Bias-induced chiral current and topological blockadein triple quantum dots
2019
Online
report
Zugriff:
We theoretically investigate the quantum transport properties of a triangular triple quantum dot (TTQD) ring connected with two reservoirs by means of analytical derivation and accurate hierarchical-equations-of-motion calculation. A bias-induced chiral current in the absence of magnetic field is firstly demonstrated, which results from that the coupling between spin gauge field and spin current in the nonequilibrium TTQD induces a scalar spin chirality that lifts the chiral degeneracy and thus the time inversion symmetry. The chiral current is proved to oscillate with bias within the Coulomb blockade regime, which opens a possibility to control the chiral spin qubit by use of purely electrical manipulations. Then, a topological blockade of the transport current due to the localization of chiral states is elucidated by spectral function analysis. Finally, as a measurable character, the magnetoelectric susceptibility in our system is found about two orders of magnitude larger than that in a typical magnetoelectric material at low temperature.
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Bias-induced chiral current and topological blockadein triple quantum dots
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Autor/in / Beteiligte Person: | Wang, Yuan ; Dong ; Zhu, Zhen ; Gang ; Wei, Jian ; Hua ; Yan, Yi ; Jing |
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Veröffentlichung: | 2019 |
Medientyp: | report |
DOI: | 10.1209/0295-5075/130/17003 |
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