Fizika Nizkikh Temperatur: Volume 43, Number 8 (August 2017), p. 1166-1173    ( to contents , go back )

2D magnetofermionic condensate in GaAs/AlGaAs heterostructures

L.V. Kulik, A.V. Gorbunov, A.S. Zhuravlev, V.B. Timofeev, and I.V. Kukushkin

Institute of Solid State Physics, Russian Academy of Sciences 2 Academician Ossipyan Str., Chernogolovka 142432, Russia
E-mail: gorbunov@issp.ac.ru

Received February 8, 2017

Abstract

A principally new collective state — magnetofermionic condensate — has been found at excitation of long-lived triplet cyclotron magnetoexcitons in Hall isolator with high electron mobility, filling factor ν = 2 and at low temperatures, Т < 1 К. The condensed phase interacts coherently with external electromag-netic field, exhibiting super-emitting properties, and due to low viscosity spreading over macroscopic dis-tances from the excitation spot along the 2D structure surface. The discovered effects are explained in terms of coherent condensate appearing in a non-equilibrium system of 2D fermions with totally quantized energy spectrum where a degenerate ensemble of long-lived triplet magnetoexcitons with Bose statistics has been created. The condensate occurs in the space of vectors of magnetic translations, the landscape opening new opportunities for future physical investigations.

PACS: 71.35.Lk Collective effects (Bose effects, phase space filling, and excitonic phase transitions);
PACS: 73.21.Fg Electron states and collective exci-tations in multilayers, quantum wells, mesoscopic, and nanoscale systems: Quantum wells;
PACS: 78.67.De Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures: Quantum wells.

Key words: 2D triplet cyclotron magnetoexcitons, Hall insulator, 2D fermion system, magnetofermionic condensate.

Published online: June 26, 2017

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