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Spin Transport over Huge Distances in a Magnetized 2D Electron System
Author(s) -
Gorbunov Alexander V.,
Kuznetsov Vladimir A.,
Zhuravlev Andrey S.,
Kulik Leonid V.,
Dickmann Sergey,
Timofeev Vladislav B.
Publication year - 2019
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201800443
Subject(s) - physics , condensed matter physics , electron , spin (aerodynamics) , boson , magnetic field , exciton , spin polarization , quantum mechanics , thermodynamics
Experimental results on the properties of a recently discovered new collective state, the magnetofermionic condensate, are summarized herein. Condensation occurs in a fermionic system, a quantum Hall insulator (filling factor ν = 2), as a result of the formation of a dense ensemble of long‐lived spin cyclotron magnetoexcitons, composite bosons. At temperatures below 1 K, the exciton ensemble exhibits a sharp enhancement in its response to an external electromagnetic field due to the formation of a super‐absorbing state that interacts coherently with the electromagnetic field. Simultaneously, the electrons below the Fermi level rearrange to form a new non‐equilibrium radiative recombination channel. The condensate shows a sharp decrease in viscosity and the ability to spread over macroscopically large distances, on the order of a millimeter, at a speed of ≈ 10 3cms − 1. Due to this rapid long‐distance spin transfer, new opportunities in the field of spintronics have been opened up.