Regensburg 2000 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 5: Quantenpunkte und Quantendr
ähte: Theorie

HL 5.1: Vortrag

Montag, 27. März 2000, 10:30–10:45, H15

The Dicke effects in dots and wires — •T. Brandes — 1. Inst. Theor. Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg

We give a short review of coherent effects in the transport properties of coupled quantum dots and wires. In double dots, spontaneous emission of phonons (as identified in the inelastic current [1]) appears as the Dicke subradiance channel, known from quantum optics and ion traps. Coupled dots can exhibit the superradiance effect [2].

In disordered quantum wires, we predict the spectral line narrowing [3] to appear in the AC-Drude conductivity for strong magnetic fields.

[1] T. Fujisawa et al., Science 282, 932 (1998); T. Brandes, B. Kramer, Phys. Rev. Lett. 83, 3021 (1999).

[2] R. H. Dicke, Phys. Rev. 93, 99 (1954).

[3] R. H. Dicke, Phys. Rev. 89, 472 (1953).