Landau subbands generated by a lateral electrostatic superlattice - chasing the Hofstadter butterfly
Landau subbands generated by a lateral electrostatic superlattice - chasing the Hofstadter butterfly
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由横向静电超晶格产生的朗道子带 - 追逐霍夫施塔特蝴蝶
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
M. Holland
中科院分区：
文献类型：
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作者：
T. Schlösser;K. Ensslin;J. Kotthaus;M. Holland
对GaAs-AlGaAs异质结中二维电子系统的磁电阻研究表明，在低温下，单个朗道带的特征分裂暴露于周期在100 nm范围内的电压可调方形横向超晶格。在p/q通量量子穿透超晶格的晶胞的磁场值附近，p和q是小整数，可以观察到p个子带。讨论了必须满足哪些条件才能揭示这种朗道带的霍夫施塔特型分裂，阐明了在追逐霍夫施塔特蝴蝶时必须克服的实验困难。
Magnetoresistance studies on two-dimensional electron systems in GaAs - AlGaAs heterojunctions exposed to voltage-tunable square lateral superlattices with periods in the 100 nm range reveal at low temperatures a characteristic splitting of individual Landau bands. Around magnetic field values at which p/q flux quanta penetrate the unit cell of the superlattice, with p and q being small integers, p subbands can be observed. A discussion of which conditions have to be met to reveal such Hofstadter-type splitting of Landau bands illuminates the experimental difficulties that have to be overcome in chasing the Hofstadter butterfly.