Subhasis Sinha
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View article: Exploring the Properties of Quantum Scars in a Toy Model
Exploring the Properties of Quantum Scars in a Toy Model Open
We introduce the concept of ergodicity and explore its deviation caused by quantum scars in an isolated quantum system, employing a pedagogical approach based on a toy model. Quantum scars, originally identified as traces of classically un…
View article: Exploring the properties of quantum scars in a toy model
Exploring the properties of quantum scars in a toy model Open
We introduce the concept of ergodicity and explore its deviation caused by quantum scars in an isolated quantum system, employing a pedagogical approach based on a toy model. Quantum scars, originally identified as traces of classically un…
View article: Tribological behavior of a Ti42Nb42Mo6Fe5Cr5 complex concentrated alloy and prediction through response surface methodology based mathematical modeling
Tribological behavior of a Ti42Nb42Mo6Fe5Cr5 complex concentrated alloy and prediction through response surface methodology based mathematical modeling Open
In the present work, a novel Ti42Nb42Mo6Fe5Cr5 complex concentrated alloy (CCA) was developed using the vacuum arc melting technique. The as-cast CCA underwent a two-stage heat treatment process. In the first stage of heat treatment (HT 1)…
View article: Classical route to ergodicity and scarring in collective quantum systems
Classical route to ergodicity and scarring in collective quantum systems Open
Ergodicity, a fundamental concept in statistical mechanics, is not yet a fully understood phenomena for closed quantum systems, particularly its connection with the underlying chaos. In this review, we consider a few examples of collective…
View article: Emergence of a quasi-ergodic steady state in a dissipative Tavis-Cummings array
Emergence of a quasi-ergodic steady state in a dissipative Tavis-Cummings array Open
In an atom-photon interacting system described by Tavis Cummings Hubbard (TCH) model, we demonstrate the emergence of a quasi-steady state in a dissipative environment that exhibits intriguing ergodic behavior. The TCH model undergoes a di…
View article: Classical route to ergodicity and scarring in collective quantum systems
Classical route to ergodicity and scarring in collective quantum systems Open
Ergodicity, a fundamental concept in statistical mechanics, is not yet a fully understood phenomena for closed quantum systems, particularly its connection with the underlying chaos. In this review, we consider a few examples of collective…
View article: Formation of paired phases of bosons and their excitations in a square lattice
Formation of paired phases of bosons and their excitations in a square lattice Open
We investigate the formation of paired states of bosons in an optical lattice, namely, pair superfluid (PSF) and pair supersolid (PSS) in the presence of pair hopping as well as the next nearest neighbor (NNN) interaction mimicking long-ra…
View article: Classical route to ergodicity and scarring phenomena in a two-component Bose-Josephson junction
Classical route to ergodicity and scarring phenomena in a two-component Bose-Josephson junction Open
We consider a Bose-Josephson junction (BJJ) formed by a binary mixture of ultracold atoms to investigate the manifestation of coherent collective dynamics on ergodicity and quantum scars, unfolding the connection between them. By tuning th…
View article: Dynamical route to ergodicity and quantum scarring in kicked coupled top
Dynamical route to ergodicity and quantum scarring in kicked coupled top Open
Unlike classical systems, understanding ergodicity from phase space mixing remains unclear for interacting quantum systems due to the absence of phase space trajectories. By considering an interacting spin model known as kicked coupled top…
View article: Quantum transitions, ergodicity, and quantum scars in the coupled top\n model
Quantum transitions, ergodicity, and quantum scars in the coupled top\n model Open
We consider an interacting collective spin model known as coupled top (CT),\nexhibiting a rich variety of phenomena related to quantum transitions,\nergodicity, and formation of quantum scars, discussed in [Phys. Rev. E 102,\n020101(R) (20…
View article: Fingerprint of chaos and quantum scars in kicked Dicke model: an out-of-time-order correlator study
Fingerprint of chaos and quantum scars in kicked Dicke model: an out-of-time-order correlator study Open
We investigate the onset of chaos in a periodically kicked Dicke model (KDM), using the out-of-time-order correlator (OTOC) as a diagnostic tool, in both the oscillator and the spin subspaces. In the large spin limit, the classical Hamilto…
View article: Phases and collective modes of bosons in a triangular lattice at finite temperature: A cluster mean field study
Phases and collective modes of bosons in a triangular lattice at finite temperature: A cluster mean field study Open
Motivated by the realization of Bose-Einstein condensates (BEC) in non-cubic lattices, in this work we study the phases and collective excitation of bosons with nearest neighbor interaction in a triangular lattice at finite temperature, us…
View article: Chaos and Quantum Scars in Bose-Josephson Junction Coupled to a Bosonic Mode
Chaos and Quantum Scars in Bose-Josephson Junction Coupled to a Bosonic Mode Open
We consider a model describing Bose-Josephson junction (BJJ) coupled to a single bosonic mode exhibiting quantum phase transition (QPT). Onset of chaos above QPT is observed from semiclassical dynamics as well from spectral statistics. Bas…
View article: Chaos and quantum scars in a coupled top model
Chaos and quantum scars in a coupled top model Open
We consider a coupled top model describing two interacting large spins, which is studied semiclassically as well as quantum mechanically. This model exhibits a variety of interesting phenomena such as a quantum phase transition (QPT), a dy…
View article: Phases and collective modes of bosons in a triangular lattice at finite temperature: A cluster mean field study
Phases and collective modes of bosons in a triangular lattice at finite temperature: A cluster mean field study Open
Motivated by the realization of Bose-Einstein condensates (BEC) in non-cubic lattices, in this work we study the phases and collective excitation of bosons with nearest neighbor interaction in a triangular lattice at finite temperature, us…
View article: Dynamics of quasiperiodically driven spin systems
Dynamics of quasiperiodically driven spin systems Open
We study the stroboscopic dynamics of a spin-S object subjected to δ-function kicks in the transverse magnetic field which is generated following the Fibonacci sequence. The corresponding classical Hamiltonian map is constructed in the lar…
View article: One-Dimensional Quasicrystals with Power-Law Hopping
One-Dimensional Quasicrystals with Power-Law Hopping Open
One-dimensional quasiperiodic systems with power-law hopping, 1/r^{a}, differ from both the standard Aubry-André (AA) model and from power-law systems with uncorrelated disorder. Whereas in the AA model all single-particle states undergo a…
View article: Signature of chaos and delocalization in a periodically driven many-body system: An out-of-time-order-correlation study
Signature of chaos and delocalization in a periodically driven many-body system: An out-of-time-order-correlation study Open
We study out-of-time-order correlation (OTOC) for one-dimensional\nperiodically driven hardcore bosons in the presence of Aubry-Andr\\'e (AA)\npotential and show that both the spectral properties and the saturation values\nof OTOC in the s…
View article: A finite temperature study of ideal quantum gases in the presence of one dimensional quasi-periodic potential
A finite temperature study of ideal quantum gases in the presence of one dimensional quasi-periodic potential Open
We study the thermodynamics of ideal Bose gas as well as the transport properties of non interacting bosons and fermions in a one dimensional quasi-periodic potential, namely Aubry-Andr\'e (AA) model at finite temperature. For bosons in fi…
View article: Drive-induced delocalization in the Aubry-André model
Drive-induced delocalization in the Aubry-André model Open
Motivated by the recent experiment by Bordia et al. [Nat. Phys. 13, 460 (2017)NPAHAX1745-247310.1038/nphys4020], we study the single particle delocalization phenomena of the Aubry-André (AA) model subjected to periodic drives. In two disti…
View article: A finite temperature study of one dimensional quantum gases in a quasi-periodic potential
A finite temperature study of one dimensional quantum gases in a quasi-periodic potential Open
We study the thermodynamics of ideal Bose gas as well as the transport properties of non interacting bosons and fermions in a one dimensional quasi-periodic potential, namely Aubry-Andre (AA) model at finite temperature. For bosons in fini…
View article: Bosons with incommensurate potential and spin-orbit coupling
Bosons with incommensurate potential and spin-orbit coupling Open
We chart out the phase diagram of ultracold `spin-half' bosons in a\none-dimensional optical lattice in the presence of Aubry-Andr\\'e (AA) potential\nand with spin-orbit (SO) and Raman couplings investigating the transition from\nsuperflu…
View article: Quantum Fluctuations in Quasi-One-Dimensional Dipolar Bose-Einstein Condensates
Quantum Fluctuations in Quasi-One-Dimensional Dipolar Bose-Einstein Condensates Open
Raw data for the depicted graphs in the given paper/letter
View article: Quantum Fluctuations in Quasi-One-Dimensional Dipolar Bose-Einstein Condensates
Quantum Fluctuations in Quasi-One-Dimensional Dipolar Bose-Einstein Condensates Open
Raw data for the depicted graphs in the given paper/letter
View article: Quantum droplets in one-dimensional dipolar Bose-Einstein condensates
Quantum droplets in one-dimensional dipolar Bose-Einstein condensates Open
Recent experiments have revealed that beyond-mean-field corrections are much more relevant in weakly-interacting dipolar condensates than in their non-dipolar counterparts. We show that in quasi-one-dimensional geometries quantum correctio…
View article: Quantum signature of chaos and thermalization in the kicked Dicke model
Quantum signature of chaos and thermalization in the kicked Dicke model Open
We study the quantum dynamics of the kicked Dicke model (KDM) in terms of the Floquet operator, and we analyze the connection between chaos and thermalization in this context. The Hamiltonian map is constructed by suitably taking the class…
View article: Phases, collective modes, and nonequilibrium dynamics of dissipative Rydberg atoms
Phases, collective modes, and nonequilibrium dynamics of dissipative Rydberg atoms Open
We use a density matrix formalism to study the equilibrium phases and\nnon-equilibrium dynamics of a system of dissipative Rydberg atoms in an optical\nlattice within mean-field theory. We provide equations for the fixed points of\nthe den…
View article: Localization of weakly interacting Bose gas in quasiperiodic potential
Localization of weakly interacting Bose gas in quasiperiodic potential Open
We study the localization properties of weakly interacting Bose gas in a\nquasiperiodic potential commonly known as Aubry-Andr\\'e model. Effect of\ninteraction on localization is investigated by computing the `superfluid\nfraction' and `i…
View article: Quantum phases of hardcore bosons in two coupled chains: A density matrix renormalization group study
Quantum phases of hardcore bosons in two coupled chains: A density matrix renormalization group study Open
We consider hardcore bosons in two coupled chain of one dimensional lattices\nat half filling with repulsive intra-chain interaction and inter-chain\nattraction. This can be mapped on to a coupled chain of spin-1/2 XXZ model with\ninter ch…