Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates

Kovalev, V. M.; Savenko, I. G.

doi:10.1038/s41598-017-01125-4

Cited by 11 publications

(7 citation statements)

References 50 publications

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“…(21) in series over ω/T . Using the expression for the nonlinear response function for quasiballistic electrons [19] (22) we find the cross-mobility in the quasiballistic regime:…”

Section: B Quasi-ballistic Regimementioning

confidence: 99%

Coulomb drag of excitons in Bose-Fermi systems

2019

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We develop a microscopic theory of the Coulomb drag effect in a hybrid system consisting of spatially separated two-dimensional quantum gases of degenerate electrons and dipolar excitons. We consider both the normal-phase and condensate regimes of the exciton subsystem and investigate the cross-mobility of the system being the kinetic coefficient, which couples the static electric field applied to the electron layer with the particle density current (flux) in the exciton subsystem. We study the temperature dependence of the cross-mobility and its dependence on the interlayer separation. We show that exciton-exciton interaction plays a dramatic role. If the exciton gas is in the normal phase, then the screening of interlayer interaction by the exciton subsystem results in an exponential damping of the cross-mobility with the decrease of temperature, while at low temperatures, the interactions result in a robust bosonic transport due to the emergence of the Bogoliubov quasiparticles. II. CROSS-MOBILITY OF AN EXCITON-ELECTRON SYSTEMWe consider a hybrid 2DEG-indirect exciton gas system (Fig. 1). The electron-exciton interaction results in the exciton flux, provided that an electric field is applied to the electronic layer. Within the linear response theory, the exciton flux J = n ex µ D E is proportional to the external (bias) electric field E, the density of exciton gas n ex , and the cross-mobility µ D , which we will concentrate on. arXiv:1902.09721v1 [cond-mat.mes-hall]

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“…(21) in series over ω/T . Using the expression for the nonlinear response function for quasiballistic electrons [19] (22) we find the cross-mobility in the quasiballistic regime:…”

Section: B Quasi-ballistic Regimementioning

confidence: 99%

Coulomb drag of excitons in Bose-Fermi systems

2019

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“…The presence of the vortices in the σ − component and the spatial inhomogeneity of the σ + component are neglected at this scale. Similar problems for spinor condensates were considered previously [65][66][67] , but never under quasi-resonant circular polarized pumping in presence of the TE-TM splitting. These equations represent an eigenvalue problem with respect to the bogolon energy hω.…”

Section: Bogolon Instabilitymentioning

confidence: 56%

Topological turbulence in spin-orbit-coupled driven-dissipative quantum fluids of light generates high angular momentum states

Koniakhin,

Malpuech,

Solnyshkov

et al. 2020

Preprint

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We demonstrate the formation of a high angular momentum turbulent state in an excitonpolariton quantum fluid with TE-TM Spin-Orbit Coupling (SOC). The transfer of particles from quasi-resonantly cw pumped σ+ component to σ− component is accompanied with the generation of a turbulent gas of quantum vortices by inhomogeneities. We show that this system is unstable with respect to the formation of bogolons at a finite wave vector, controlled by the laser detuning. In a finite-size cavity, the domains with this wave vector form a ring-like structure along the border of a cavity, with a gas of mostly same-sign vortices in the center. The total angular momentum is imposed by the sign of TE-TM SOC, the wave vector of instability, and the cavity size. This effect can be detected experimentally via local dispersion measurements or by interference. The proposed configuration thus allows simultaneous experimental studies of quantum turbulence and high-angular momentum states in continuously-pumped exciton-polariton condensates.

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“…Additionally, proposals to investigate fractal structure induced by disorder 41 and measurement of system replicas simultaneously 42 have been put forward. The interplay of disorder with spin-orbit coupling 43 , spin degrees of freedom 44,45 , supersolidity 46 , and Dirac fermions 47 are being explored. New developments to diagnose critical behaviour in the Hubbard model using neural networks have been considered 48 , as well as, engineering of bound states via disorder 49 .…”

Section: Introductionmentioning

confidence: 99%

Localisation of weakly interacting bosons in two dimensions: disorder vs lattice geometry effects

González-García¹,

Caballero-Benítez²,

Paredes

2019

Sci Rep

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We investigate the effects of disorder and lattice geometry against localisation phenomena in a weakly interacting ultracold bosonic gas confined in a 2D optical lattice. The behaviour of the quantum fluid is studied at the mean-field level performing computational experiments, as a function of disorder strength for lattices of sizes similar to current experiments. Quantification of localisation, away from the Bose glass phase, was obtained directly from the stationary density profiles through a robust statistical analysis of the condensate component, as a function of the disorder amplitude. Our results show a smooth transition, or crossover, to localisation induced by disorder in square and triangular lattices. In contrast, associated to its larger tunneling amplitude, honeycomb lattices show absence of localisation for the same range of disorder strengths and same lattice amplitude, while also exhibiting partial localisation for large disorder amplitudes. We also conclude that the coordination number z have a partial influence on how fast this smooth transition occurs as the system size increases. Signatures of disorder are also found in the ground state energy spectrum, where a continuous distribution emerges instead of a distribution of sharp peaks proper to the system in the absence of disorder.

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Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates

Cited by 11 publications

References 50 publications

Coulomb drag of excitons in Bose-Fermi systems

Coulomb drag of excitons in Bose-Fermi systems

Topological turbulence in spin-orbit-coupled driven-dissipative quantum fluids of light generates high angular momentum states

Localisation of weakly interacting bosons in two dimensions: disorder vs lattice geometry effects

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