Terahertz Coherent Control of a Landau-Quantized Two-Dimensional Electron Gas

Details Terahertz Coherent Control of a Landau-Quantized Two-Dimensional Electron Gas Terahertz Coherent Control of a Landau-Quantized Two-Dimensional Electron Gas

2011-09-28

arxiv.org/abs/1109.6062v1

Physical Review B 84, 241307(R) (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.241307

We demonstrate coherent control of cyclotron resonance (CR) in a two-dimensional electron gas (2DEG). We use a sequence of terahertz pulses to control the amplitude of CR oscillations in an arbitrary fashion via phase-dependent coherent interactions. We observe a self-interaction effect, where the 2DEG interacts with the terahertz field emitted by itself within the decoherence time, resulting in a revival and collapse of quantum coherence. These observations are accurately describable using {\em single-particle} optical Bloch equations, showing no signatures of electron-electron interactions, which verifies the validity of Kohn's theorem for CR in the coherent regime.

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