Optical probing of electronic fractional quantum Hall states

Article

关键词: PHOTOLUMINESCENCE;    INTEGER;    EXCITONS;    ENERGY;    RESONANCE;    FLUID;    GAS;   

DOI  :  10.1103/PhysRevB.81.201304

来源: SCIE

【 摘 要 】

We report on the observation of a fine structure in the photoluminescence emission of high-mobility GaAs/AlGaAs single heterojunctions in the fractional quantum Hall regime. A splitting of the emission band into three lines is found both at filling factor nu = 2/3 and in the region 2/5 > nu > 1/3. The dependencies on filling factor, electron density, and temperature show that the fine structure arises from the recombination of fractionally charged elementary excitations of the two-dimensional electron liquid and an itinerant valence-band hole. These quasiparticle excitations (anyon excitons) exhibit a dispersion relation with an absolute minimum at large momentum, leading to a characteristic, broad emission band at the low-energy side of the photoluminescence spectrum around nu = 1/3.

【 授权许可】

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