Thermopower of Aharonov-Bohm Interferometer with a Quantum Dot

Details Thermopower of Aharonov-Bohm Interferometer with a Quantum Dot Thermopower of Aharonov-Bohm Interferometer with a Quantum Dot

2001-10-12

arxiv.org/abs/cond-mat/0110261v2

Phys. Rev. Lett. 88, 136601 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.88.136601

We report on the thermopower of an Aharonov-Bohm interferometer (AB) with a quantum dot in the Kondo limit. The thermopower is anomalously enhanced due to the Kondo effect as in heavy fermion systems. In contrast to the bulk systems, the sign of the thermopower can be changed by adjusting the energy level scheme or the particle-hole asymmetry of a dot with the gate voltage. Further the magnitude and even the sign of the thermopower in the AB ring can be changed at will with varying either magnetic fields or the gate voltages.

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