Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 75: Transport: Quantum dots, quantum wires, point contacts 1 (TT with HL)

HL 75.1: Vortrag

Donnerstag, 19. März 2015, 11:00–11:15, A 053

Interference of real and virtual transitions in quantum dot chains — •Fernando Gallego-Marcos, Rafael Sánchez, and Gloria Platero — Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Spain

We analyzed long-range transport through an ac driven triple quantum dot. Resonant transitions between separated and detuned dots are mediated by the exchange of n photons with the time-dependent field. An effective model is proposed in terms of higher-order transitions which involve the virtual only occupation of the intermediate dot [1]. The ac driving modulates the tunneling processes within the quantum dot system [2]. We investigate the interplay between real transitions through the centre dot and virtual long-range tunneling. We find configurations where the two paths interfere destructively and totally block the current. The effect of the driving phase will be emphasized.

[1] R. Sánchez, F. Gallego-Marcos, G. Platero,

Phys. Rev. B 89, 161402 (2014)

[2] F. Gallego-Marcos, R. Sánchez, G. Platero, arXiv:1408.4923