14 citations · 64 across the 14 of their papers we have counts for
15 papers
Non-resonant inter-species interaction and its effect on the position response function of cold atoms
Anirban Misra, Urbashi Satpathi, Supurna Sinha +2
In the context of non-equilibrium statistical physics, the position response of a particle, coupled to a bath, subjected to an external force is a topic of broad interest. A topic…
Effect of light-assisted tunable interaction on the position response function of cold atoms
Anirban Misra, Urbashi Satpathi, Supurna Sinha +2
The position response of a particle subjected to a perturbation is of general interest in physics. We study the modification of the position response function of an ensemble of col…
Chaos assisted many-body tunnelling
Urbashi Satpathi, Sayak Ray, Amichay Vardi
We study the interplay of chaos and tunnelling between two weakly-coupled Bose-Josephson junctions. The classical phase space of the composite system has a mixed structure includin…
Quantum Brownian Motion of a charged oscillator in a magnetic field coupled to a heat bath through momentum variables
Suraka Bhattacharjee, Urbashi Satpathi, Supurna Sinha
We study the Quantum Brownian motion of a charged particle moving in a harmonic potential in the presence of an uniform external magnetic field and linearly coupled to an Ohmic bat…
Long Time Tails in Quantum Brownian Motion of a charged particle in a magnetic field
Suraka Bhattacharjee, Urbashi Satpathi, Supurna Sinha
We analyse the long time tails of a charged quantum Brownian particle in a harmonic potential in the presence of a magnetic field using the Quantum Langevin Equation as a starting…
Quantum Langevin dynamics of a charged particle in a magnetic field : Response function, position-velocity and velocity autocorrelation functions
Suraka Bhattacharjee, Urbashi Satpathi, Supurna Sinha
We use the Quantum Langevin equation as a starting point to study the response function, the position-velocity correlation function and the velocity autocorrelation function of a c…
Soliton-like behaviour in non-integrable systems
Raghavendra Nimiwal, Urbashi Satpathi, Vishal Vasan +1
We present a general scheme for constructing robust excitations (soliton-like) in non-integrable multicomponent systems. By robust, we mean localised excitations that propagate wit…
Measurements and analysis of response function of cold atoms in optical molasses
Subhajit Bhar, Maheswar Swar, Urbashi Satpathi +4
We report our experimental measurements and theoretical analysis of the position response function of a cloud of cold atoms residing in the viscous medium of an optical molasses an…
Quantum Brownian Motion: Drude and Ohmic Baths as Continuum Limits of the Rubin Model
Avijit Das, Abhishek Dhar, Ion Santra +2
The motion of a free quantum particle in a thermal environment is usually described by the quantum Langevin equation, where the effect of the bath is encoded through a dissipative…
Non-equilibrium Quantum Langevin dynamics of orbital diamagnetic moment
Urbashi Satpathi, Supurna Sinha
We investigate the time dependent orbital diamagnetic moment of a charged particle in a magnetic field in a viscous medium via the Quantum Langevin Equation. We study how the inter…
Transmitting a signal in negative time
P. Singha Deo, Urbashi Satpathi
There is no self adjoint time operator defined in quantum mechanics. However, time intervals can be defined in several ways and can also be probed experimentally. Our interest in t…
Quantum Brownian motion in a magnetic field: Transition from monotonic to oscillatory behaviour
Urbashi Satpathi, Supurna Sinha
We investigate the Brownian motion of a charged particle in a magnetic field. We study this in the high temperature classical and low temperature quantum domains. In both domains,…
Negative partial density of states in mesoscopic systems
Urbashi Satpathi, P. Singha Deo
Since the experimental observation of quantum mechanical scattering phase shift in mesoscopic systems, several aspects of it has not yet been understood. The experimental observati…
Charge and spin density waves: Quasi one dimension to two dimension
Urbashi Satpathi, Sumit Ghosh, A. K. Ray +1
Possibility of electronic charge and spin separation leading to charge density wave and spin density wave is well established in one dimensional systems in presence and absence of…
Injectance and a paradox
Urbashi Satpathi, P. Singha Deo
Quantum mechanics manifests in experimental observations in several ways. Hauge et al. (1987) and Leavens et al. (1989) had pointed out that interference effects dominate a physica…