期刊
PHYSICAL REVIEW B
卷 100, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.045427
关键词
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资金
- National Research Foundation of Korea [NRF-2017R1C1B5076824, IBS-R024-D1, NRF-2016R1D1A1B04-935798]
- Korea Institute for Advanced Study (KIAS)
- Chosun University
We report a dual resonance feature in the ballistic conductance through a quantum Hall graphene nanoribbon with a magnetic quantum dot. Such a magnetic quantum dot localizes Dirac fermions exhibiting anisotropic eigenenergy spectra with broken time-reversal symmetry. Interplay between the localized states and quantum Hall edge states is found to be twofold, showing Breit-Wigner and Fano resonances, which is reminiscent of a double quantum dot system. By fitting the numerical results with the Fano-Breit-Wigner line shape from the double quantum dot model, we demonstrate that the twofold resonance is due to the valley mixing that comes from the coupling of the magnetic quantum dot with quantum Hall edge channels; an effective double quantum dot system emerges from a single magnetic quantum dot in virtue of the valley degree of freedom. It is further confirmed that the coupling is weaker for the Fano resonance and stronger for the Breit-Wigner resonance.
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