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New effects in and the control of the exciton system in quasi-two-dimensional structures

 a, b
a Institute of Spectroscopy, Russian Academy of Sciences, ul. Fizicheskaya 5, Troitsk, Moscow, 108840, Russian Federation
b National Research University Higher School of Economics, ul. Myasnitskaya 20, Moscow, 101000, Russian Federation

New effects in a system of quantum dipoles are discussed, such as anisotropic superfluidity in external fields, strong correlations, crystallization and the supersolid phase. Roton instability effects typical of strongly correlated Bose systems but also manifesting themselves in a weakly interacting system of titled dipoles are analyzed. Among the interesting physical realizations of the systems under consideration are dipole excitons in single or coupled quantum wells under a strong transverse electric field and in van der Waals heterostructures of new 2D materials such as transition metal dichalcogenides (TMDC). The use at ultralow temperatures of polar molecules or atoms with permanent or external-field-induced dipoles are also interesting realizations, as are Rydberg atoms in an external electric field.

Fulltext is available at IOP
Keywords: dipolar excitons, Bose condensate, superfluidity, quantum wells, 2D materials, strong correlation effects, crystal phase, roton instability, supersolid
PACS: 03.75.Nt, 67.80.−s, 73.21.Fg, 71.35.−y, 71.45.−d (all)
DOI: 10.3367/UFNe.2017.12.038355
URL: https://ufn.ru/en/articles/2018/11/h/
Citation: Lozovik Yu E "New effects in and the control of the exciton system in quasi-two-dimensional structures" Phys. Usp. 61 1094–1099 (2018)
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Received: 24th, March 2018, 13th, December 2017

Оригинал: Лозовик Ю Е «Новые эффекты и управление в системе экситонов в квазидвумерных структурах» УФН 188 1203–1208 (2018); DOI: 10.3367/UFNr.2017.12.038355

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