Zero-energy modes in serially coupled double quantum dots
Abstract
We investigate symmetrically coupled double quantum dots via the hierarchical equations of motion method and propose a novel zero-energy mode (ZEM) at a temperature above the spin singlet-triplet transition temperature. Owing to the resonance of electron quasi-particle and hole quasi-particle, ZEM has a peak at ω = 0 in the spectral density function. We further examine the effect of the magnetic field on the ZEM, where an entanglement of spin and charge has been determined; therefore, the magnetic field can split the ZEM in the spectra. *Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418 and 11374363).
- Publication:
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Chinese Physics B
- Pub Date:
- June 2020
- DOI:
- 10.1088/1674-1056/ab8378
- Bibcode:
- 2020ChPhB..29f7302S
- Keywords:
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- zero-energy mode;
- quantum dot;
- temperature;
- 73.21.La;
- 73.63.Kv;
- 74.62.-c