scholarly journals Spin Transport in a Quantum Hall Insulator

2021 ◽  
Vol 11 (17) ◽  
pp. 8131
Author(s):  
Azaliya Azatovna Zagitova ◽  
Andrey Sergeevich Zhuravlev ◽  
Leonid Viktorovich Kulik ◽  
Vladimir Umansky
Keyword(s):  
Spin Transport ◽  
Quantum Hall ◽  
Einstein Condensate ◽  
Collective State ◽  
Bose Einstein Condensate ◽  
Composite Bosons ◽  
Spin Triplet ◽  
Bose Einstein ◽  
The Given ◽  
Resonant Reflection

A novel experimental optical method, based on photoluminescence and photo-induced resonant reflection techniques, is used to investigate the spin transport over long distances in a new, recently discovered collective state—magnetofermionic condensate. The given Bose–Einstein condensate exists in a purely fermionic system (ν = 2 quantum Hall insulator) due to the presence of a non-equilibrium ensemble of spin-triplet magnetoexcitons—composite bosons. It is found that the condensate can spread over macroscopically long distances of approximately 200 μm. The propagation velocity of long-lived spin excitations is measured to be 25 m/s.

FERMION CONDENSATION IN A RELATIVISTIC DEGENERATE STAR: ARRESTED COLLAPSE AND MACROSCOPIC EQUILIBRIUM

2006 ◽  
Vol 15 (12) ◽  
pp. 2257-2265
Author(s):  
M. P. SILVERMAN
Keyword(s):  
Neutron Stars ◽  
Scattering Length ◽  
Einstein Condensate ◽  
Atomic Gases ◽  
Spherically Symmetric ◽  
Cooper Pairing ◽  
Bose Einstein Condensate ◽  
Composite Bosons ◽  
Degeneracy Pressure ◽  
Bose Einstein

Fermionic Cooper pairing leading to the BCS-type hadronic superfluidity is believed to account for periodic variations ("glitches") and subsequent slow relaxation in spin rates of neutron stars. Under appropriate conditions, however, fermions can also form a Bose–Einstein condensate of composite bosons. Both types of behavior have recently been observed in tabletop experiments with ultra-cold fermionic atomic gases. Since the behavior is universal (i.e., independent of atomic potential) when the modulus of the scattering length greatly exceeds the separation between particles, one can expect analogous processes to occur within the supradense matter of neutron stars. In this paper, I show how neutron condensation to a Bose–Einstein condensate, in conjunction with relativistically exact expressions for fermion energy and degeneracy pressure and the relations for thermodynamic equilibrium in a spherically symmetric space–time with Schwarzschild metric, leads to stable macroscopic equilibrium states of stars of finite density, irrespective of mass.

scholarly journals Transport of a Single Cold Ion Immersed in a Bose-Einstein Condensate

2021 ◽  
Vol 126 (3) ◽  
Author(s):  
T. Dieterle ◽  
M. Berngruber ◽  
C. Hölzl ◽  
R. Löw ◽  
K. Jachymski ◽  
...  
Keyword(s):  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Bose Einstein
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