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arXiv 1602.00325cond-mat.mes-hallcond-mat.str-el
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色散关系可调的层间激子

Interlayer excitons with tunable dispersion relation

Brian Skinner

摘要:

层间激子,包括一种材料中的电子通过库仑吸引力与相邻材料中的空穴结合,是可以呈现各种多体相的复合玻色子。玻色子系统的相图很大程度上取决于玻色子的色散关系,而玻色子的色散关系本身是电子和空穴的色散关系的组合。在这里,我表明,在电子或空穴有一个非单调的情况下,“墨西哥帽形”的色散关系,激子色散关系可以有一个范围内的定性不同的形式,每个对应于一个不同的多体相在低温下。这种多样性表明了一种新的平台,可以使用外部场在不同的量子相位之间进行连续调谐。

英文摘要:

Interlayer excitons, comprising an electron in one material bound by Coulomb attraction to a hole in an adjacent material, are composite bosons that can assume a variety of many-body phases. The phase diagram of the bosonic system is largely determined by the dispersion relation of the bosons, which itself arises as a combination of the dispersion relations of the electron and hole separately. Here I show that in situations where either the electron or the hole has a non-monotonic, "Mexican hat-shaped" dispersion relation, the exciton dispersion relation can have a range of qualitatively different forms, each corresponding to a different many-body phase at low temperature. This diversity suggests a novel platform for continuously tuning between different quantum phases using an external field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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