Edge and bulk effects in the Terahertz-photoconductivity of an antidot superlattice

Details Edge and bulk effects in the Terahertz-photoconductivity of an antidot superlattice Edge and bulk effects in the Terahertz-photoconductivity of an antidot superlattice

2000-05-18

arxiv.org/abs/cond-mat/0005293v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 4 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.63.045315

We investigate the Terahertz(THz)-response of a square antidot superlattice by means of photoconductivity measurements using a Fourier-transform-spectrometer. We detect, spectrally resolved, the cyclotron resonance and the fundamental magnetoplasmon mode of the periodic superlattice. In the dissipative transport regime both resonances are observed in the photoresponse. In the adiabatic transport regime, at integer filling factor $\nu =2$, only the cyclotron resonance is observed. From this we infer that different mechanisms contribute to converting the absorption of THz-radiation into photoconductivity in the cyclotron and in the magnetoplasmon resonances, respectively.

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