2D magnetofermionic condensate in GaAs/AlGaAs heterostructures

Kulik, L. V.; Gorbunov, A. V.; Zhuravlev, A. S.; Timofeev, V. B.; Kukushkin, I. V.
August 2017
Low Temperature Physics;Aug2017, Vol. 43 Issue 8, p936
Academic Journal
A principally new collective state--magnetofermionic condensate--was found upon excitation of long-lived triplet cyclotron magnetoexcitons in a Hall insulator with high electron mobility and filling factor ν = 2 at low temperatures T < 1K. The condensed phase interacts coherently with external electromagnetic field, exhibits superradiant properties and spreads over macroscopic distances from the excitation spot along the surface of the 2D structure due to its low viscosity. The observed effects are explained in terms of a coherent condensate arising in the non-equilibrium system of 2D fermions with a fully quantized energy spectrum, in which a degenerate ensemble of long-lived triplet magnetoexcitons with Bose statistics is formed. The condensation occurs in the space of magnetic translation vectors. Under these conditions, new opportunities arise for future physical studies.


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