Critical filling factor for the formation of a quantum Wigner crystal screened by a nearby layer

Article

关键词: 2-DIMENSIONAL ELECTRON-GAS;    INTERLAYER CHARGE-TRANSFER;    MAGNETIC-FIELD;    WELL STRUCTURE;    LANDAU-LEVEL;    LIQUID;    TRANSITION;    HELIUM;    CRYSTALLIZATION;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.98.081111

来源: SCIE

【 摘 要 】

One of the most fascinating ground states of an interacting electron system is the so-called Wigner crystal where the electrons, in order to minimize their repulsive Coulomb energy, form an ordered array. Here, we report measurements of the critical filling factor (nu(c)) below which a magnetic-field-induced, quantum Wigner crystal forms in a dilute, two-dimensional electron layer when a second, high-density electron layer is present in close proximity. The data reveal that the Wigner crystal forms at a significantly smaller nu(c) compared to the nu(c) (similar or equal to 0.20) in single-layer two-dimensional electron systems. The measured nu(c) exhibits a strong dependence on the interlayer distance, reflecting the interaction and screening from the adjacent, high-density layer.

【 授权许可】

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