Volume 123, Number 1, July 2018
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||31 July 2018|
Phase diagrams for superfluidity of indirect excitons in double Hall systems GaAs/GaAlAs/GaAs and bilayer-graphene/hBN/bilayer-graphene
Department of Quantum Technologies, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology - Wrocław, Poland
Received: 15 November 2017
Accepted: 16 July 2018
The energy competition of the reentrant integer quantum Hall state and the superfluid Bose Einstein condensate of indirect excitons in twin 2D Hall systems separated by an insulating barrier and with complementary layer fillings, , has been analysed and compared with experimental observations in GaAs/GaAlAs/GaAs and bilayer-graphene/hBN/bilayer-graphene in the so-called counterflow and drag configurations. The related phase diagrams for varying fillings of layers and barrier thickness have been determined. A modification of the phase transition diagrams due to a change of the drag to the counterflow configuration is illustrated in agreement with the observations. The presented model appears to be consistent with the experimental observations.
PACS: 67.85.De – Dynamic properties of condensates; excitations, and superfluid flow / 73.43.-f – Quantum Hall effects / 73.43.Lp – Collective excitations
© EPLA, 2018
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