Arko Roy
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View article: Kibble-Zurek Scaling and Spatial Statistics in Quenched Binary Bose Superfluids
Kibble-Zurek Scaling and Spatial Statistics in Quenched Binary Bose Superfluids Open
We study how gradually changing the chemical potential causes a two-dimensional binary Bose gas to condense from vacuum to finite density, resulting in either a mixed (miscible) or separated (immiscible) state depending on interaction stre…
View article: Thermal amplification and melting of phases in spin–orbit-coupled spin-1 Bose–Einstein condensates
Thermal amplification and melting of phases in spin–orbit-coupled spin-1 Bose–Einstein condensates Open
We implement the Hartree–Fock–Bogoliubov theory with the Popov approximation for a homogeneous Raman-induced spin–orbit-coupled spin-1 Bose–Einstein condensate and investigate the effects of finite temperature ( T ) on the ground-state pha…
View article: Thermal amplification and melting of phases in spin-orbit-coupled spin-1 Bose-Einstein condensates
Thermal amplification and melting of phases in spin-orbit-coupled spin-1 Bose-Einstein condensates Open
We implement Hartree-Fock-Bogoliubov theory with Popov approximation for a homogeneous Raman-induced spin-orbit-coupled spin-1 Bose-Einstein condensate and investigate the effects of finite temperature ($T$) on the ground-state phase diagr…
View article: Frequency-selective amplification of nonlinear response in strongly correlated bosons
Frequency-selective amplification of nonlinear response in strongly correlated bosons Open
We present a protocol to generate enhanced non-linear responses of incident pulses in the density wave phase within the extended Bose-Hubbard model using the concept of resonance-induced amplification (RIA). This method enables the selecti…
View article: Temperature-induced supersolidity in spin-orbit-coupled Bose gases
Temperature-induced supersolidity in spin-orbit-coupled Bose gases Open
Close to the superfluid plane-wave (PW) - supersolid stripe (ST) phase transition point of a zero temperature quasi-one-dimensional spin-orbit-coupled Bose gas, we find that an increase in temperature induces a phase transition to the supe…
View article: Quantum phases and spectrum of collective modes in a spin-1 BEC with spin-orbital-angular-momentum coupling
Quantum phases and spectrum of collective modes in a spin-1 BEC with spin-orbital-angular-momentum coupling Open
Motivated by the recent experiments [Chen et al., Phys. Rev. Lett 121, 113204 (2018), Chen et al., Phys. Rev. Lett. 121, 250401 (2018)], we investigate the low-lying excitation spectrum of the ground-state phases of spin-orbital-angular-mo…
View article: Finite-temperature ferromagnetic transition in coherently coupled Bose gases
Finite-temperature ferromagnetic transition in coherently coupled Bose gases Open
A paramagnetic-ferromagnetic quantum phase transition is known to occur at zero temperature in a two-dimensional coherently coupled Bose mixture of dilute ultracold atomic gases provided the interspecies interaction strength is large enoug…
View article: Nonlinear response of interacting bosons in a quasiperiodic potential
Nonlinear response of interacting bosons in a quasiperiodic potential Open
We theoretically study the electric pulse-driven non-linear response of interacting bosons loaded in an optical lattice in the presence of an incommensurate superlattice potential. In the non-interacting limit $(U=0)$, the model admits bot…
View article: Finite temperature ferromagnetic transition in coherently coupled Bose gases
Finite temperature ferromagnetic transition in coherently coupled Bose gases Open
A paramagnetic-ferromagnetic quantum phase transition is known to occur at zero temperature in a two-dimensional coherently-coupled Bose mixture of dilute ultracold atomic gases provided the interspecies interaction strength is large enoug…
View article: Oscillating Solitons and AC Josephson Effect in Ferromagnetic Bose-Bose Mixtures
Oscillating Solitons and AC Josephson Effect in Ferromagnetic Bose-Bose Mixtures Open
Close to the demixing transition, the degree of freedom associated to relative density fluctuations of a two-component Bose-Einstein condensate is described by a non-dissipative Landau-Lifshitz equation. In the quasi one-dimensional weakly…
View article: Collective excitations in cigar-shaped spin-orbit-coupled spin-1 Bose-Einstein condensates
Collective excitations in cigar-shaped spin-orbit-coupled spin-1 Bose-Einstein condensates Open
We theoretically study the collective excitations of a spin-orbit-coupled spin-1 Bose-Einstein condensate with antiferromagnetic spin-exchange interactions in a cigar-shaped trapping potential at zero and finite temperatures using the Hart…
View article: Nonlinear dynamical response of interacting bosons to synthetic electric field
Nonlinear dynamical response of interacting bosons to synthetic electric field Open
We theoretically study the non-linear response of interacting neutral bosonic gas in a synthetically driven one-dimensional optical lattice. In particular, we examine the bosonic analogue of electronic higher harmonic generation in a stron…
View article: Design and characterization of a quantum heat pump in a driven quantum gas
Design and characterization of a quantum heat pump in a driven quantum gas Open
We propose the implementation of a quantum heat pump with ultracold atoms. It is based on two periodically driven coherently coupled quantum dots using ultracold atoms. Each dot possesses two relevant quantum states and is coupled to a fer…
View article: Higher harmonic generation in interacting bosons in optical lattices
Higher harmonic generation in interacting bosons in optical lattices Open
We study the generation of higher harmonics using intense light field in an interacting bosonic gas loaded in a one-dimensional optical lattice. We find that the strong light pulse can generate reasonably high harmonics in the insulating r…
View article: Interacting bosons in two-dimensional lattices with localized dissipation
Interacting bosons in two-dimensional lattices with localized dissipation Open
Motivated by the recent experiments on engineering localized losses in quantum gases, we study the dynamics of interacting bosons in a two-dimensional optical lattice with local dissipation. Together with the Gutzwiller mean-field theory f…
View article: Splitting of singly and doubly quantized composite vortices in two-component Bose-Einstein condensates
Splitting of singly and doubly quantized composite vortices in two-component Bose-Einstein condensates Open
We study numerically the dynamical instabilities and splitting of singly and\ndoubly quantized composite vortices in two-component Bose-Einstein condensates\nharmonically confined to quasi two dimensions. In this system, the vortices\nbeco…
View article: Collective modes in multicomponent condensates with anisotropy
Collective modes in multicomponent condensates with anisotropy Open
We report the effects of anisotropy in the confining potential on two component Bose-Einstein condensates (TBECs) through the properties of the low energy quasiparticle excitations. Starting from generalized Gross Pitaevskii equation, we o…
View article: Dynamics of phase separation in two-species Bose-Einstein condensates with vortices
Dynamics of phase separation in two-species Bose-Einstein condensates with vortices Open
We examine the dynamics associated with the miscibility-immiscibility transition of trapped two-component Bose-Einstein condensates (TBECs) of dilute atomic gases in presence of vortices. In particular, we consider TBECs of Rb hyperfine st…