Sharma, Manish, Ghosh, Sankalpa
Transport of massless Dirac fermions in graphene monolayer in the presence of a combination of singular magnetic barriers and applied electrostatic potential is analyzed. The similarity of such...
Joshi, Chaitanya, Ghosh, Sankalpa
We present a detailed numerical study of the dynamics of a disordered one-dimensional Bose-Einstein condensates in position and momentum space. We particularly focus on the region where non-linearity...
Effective field theory for spinor dipolar Bose Einstein condensates (2008)
Takahashi, M., Ghosh, Sankalpa, Mizushima, T., Machida, K.
We show that the effective theory of long wavelength low energy behavior of a dipolar Bose-Einstein condensate(BEC) with large dipole moments (treated as a classical spin) can be modeled using an...
Electron optics with magnetic vector potential barriers in graphene (2008)
Ghosh, Sankalpa, Sharma, Manish
An analysis of electron transport in graphene is presented in the presence of various arrangement of delta-function like magnetic barriers. The motion through one such barrier gives an unusual non...
Spinor dipolar Bose-Einstein condensates; Classical spin approach (2007)
Takahashi, M., Ghosh, Sankalpa, Mizushima, T., Machida, K.
Magnetic dipole-dipole interaction dominated Bose-Einstein condensates are discussed under spinful situations. We treat the spin degrees of freedom as a classical spin vector, approaching from large...
Akkermans, Eric, Ghosh, Sankalpa, Musslimani, Ziad
We present a detailed numerical study of the effect of a disordered potential on a confined one-dimensional Bose-Einstein condensate, in the framework of a mean-field description. For repulsive...
Vortex Tunneling and Transport Theory In Two-Dimensional Bose Condensates (2005)
Auerbach, Assa, Arovas, Daniel P., Ghosh, Sankalpa
The tunneling rate t_v of a vortex between two pinning sites (of strength V separated by d) is computed using the Bogoliubov expansion of vortex wavefunctions overlap. For BCS vortices, tunneling is...
Bogomol'nyi bound and screw dislocations in a mesoscopic smectic-A (2004)
Akkermans, Eric, Ghosh, Sankalpa, Schtalheim, Amos
The de Gennes free energy functional of an infinite smectic-A liquid crystal at the dual point is shown to be topological and to depend only on the number of screw dislocations and the anisotropy....
Vortices in Atomic Bose-Einstein Condensates: an Introduction (2004)
The occurrence of vortices in atomic Bose-Einstein condensates (BEC) enables a description of their superfluid behaviour. In this article we present a pedagogical introduction to the vortex physics...
Vortex nucleation through edge states in finite Bose-Einstein condensates (2003)
Akkermans, Eric, Ghosh, Sankalpa
We study the vortex nucleation in a finite Bose-Einstein condensate. Using a set of non-local and chiral boundary conditions to solve the Schr$\ddot{o}$dinger equation of non-interacting bosons in a...
Composite Bosons description of rapidly rotating Bose-Einstein Condensates (2003)
Akkermans, Eric, Ghosh, Sankalpa
Recently a novel phase transition has been observed \cite{jalin} in a rotating Bose-Einstein condensate when the rotating frequency $\Omega$ reaches the transverse trap frequency $\omega_{\bot}$ and...
Solitons in a one-dimensional interacting Bose-Einstein system (2001)
Bhaduri, RK, Ghosh, Sankalpa, Murthy, MVN
A modified Gross-Pitaevskii approximation was recently introduced for bosons in dimension d≤2 by Kolomeisky et al (Kolomeisky E B, Newman T J, Straley J P and Qi X 2000 Phys. Rev. Lett. 85 1146)....
Twocomponent Fermi vapour in a 2D rotating trap (2001)
Ghosh, Sankalpa, Murthy, M. V. N., Sinha, Subhasis
An exactly solvable model of two-component interacting Fermi vapour in two dimension within Thomas Fermi approach has been proposed. We assume a realistic off-diagonal s-wave interaction between...
Solitons in a one-dimensional interacting Bose-Einstein system (2001)
Bhaduri, RK, Ghosh, Sankalpa, Murthy, MVN
A modified Gross-Pitaevskii approximation was recently introduced for bosons in dimension d≤2 by Kolomeisky et al (Kolomeisky E B, Newman T J, Straley J P and Qi X 2000 Phys. Rev. Lett. 85 1146)....
Rotating fermions in two dimensions: Thomas Fermi approach (2000)
Ghosh, Sankalpa, Murthy, M. V. N., Sinha, Subhasis
Properties of confined mesoscopic systems have been extensively studied numerically over recent years. We discuss an analytical approach to the study of finite rotating fermionic systems in two...
Solitons in one-dimensional interacting Bose-Einstein system (2000)
Bhaduri, R. K., Ghosh, Sankalpa, Murthy, M. V. N., Sen, Diptiman
A modified Gross-Pitaevskii approximation was introduced recently for bosons in dimension $d\le2$ by Kolomeisky {\it et al.} (Phys. Rev. Lett. {\bf 85} 1146 (2000)). We use the density functional...
Quantum Hall Solitons with Intertwined Spin and Pseudospin at $\nu = \ 1$ (2000)
Ghosh, Sankalpa, Rajaraman, R.
In this paper we study in detail different types of topological solitons which are possible in bilayer quantum Hall systems at filling fraction $\nu =1$ when spin degrees of freedom are included....
Bimerons in Double Layer Quantum Hall Systems (1998)
Ghosh, Sankalpa, Rajaraman, R.
In this paper we discuss bimeron pseudo spin textures for double layer quantum hall systems with filling factor $\nu =1$. Bimerons are excitations corresponding to bound pairs of merons and...
Meron Pseudospin Solutions in Quantum Hall Systems (1997)
Ghosh, Sankalpa, Rajaraman, R.
In this paper we report calculations of some pseudospin textures for bilayer quantum hall systems with filling factor $ \nu =1$. The textures we study are isolated single meron solutions. Meron...