Journal
CHINESE PHYSICS B
Volume 31, Issue 5, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1674-1056/ac29a5
Keywords
Kondo effect; quantum dot; chiral splitting
Categories
Funding
- Physical Laboratory of High Performance Computing at Renmin University of China
- National Natural Science Foundation of China [11774418, 11374363, 21373191]
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New characteristics of the Kondo effect, arising from spin chirality induced by the Berry phase in the equilibrium state, are investigated. The analysis is based on the hierarchical equations of motion (HEOM) approach in a triangular triple quantum-dot (TTQD) structure. The study finds that under the influence of a perpendicular magnetic field, the spin chirality leads to the splitting of the Kondo peak, indicating the important role of the phase factor in the Kondo effect. This work provides insight into the quantum transport of strongly correlated electronic systems.
New characteristics of the Kondo effect, arising from spin chirality induced by the Berry phase in the equilibrium state, are investigated. The analysis is based on the hierarchical equations of motion (HEOM) approach in a triangular triple quantum-dot (TTQD) structure. In the absence of magnetic field, TTQD has four-fold degenerate chiral ground states with degenerate spin chirality. When a perpendicular magnetic field is applied, the chiral interaction is induced by the magnetic flux threading through TTQD and the four-fold degenerate states split into two chiral state pairs. The chiral excited states manifest as chiral splitting of the Kondo peak in the spectral function. The theoretical analysis is confirmed by the numerical computations. Furthermore, under a Zeeman magnetic field B, the chiral Kondo peak splits into four peaks, owing to the splitting of spin freedom. The influence of spin chirality on the Kondo effect signifies an important role of the phase factor. This work provides insight into the quantum transport of strongly correlated electronic systems.
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