28 citations · 89 across the 12 of their papers we have counts for
12 papers
Lattice bosons in a quasi-disordered environment: The effects of a superlattice potential on single particle and many particle properties
R. Ramakumar, A. N. Das, S. Sil
In this paper we present a theoretical investigation of the effect of a superlattice potential on some properties of non-interacting bosons in one dimensional lattices with Aubry-A…
Lattice bosons in a quasi-disordered environment: The effects of next-nearest-neighbor hopping on localization and Bose-Einstein condensation
R. Ramakumar, A. N. Das, S. Sil
We present a theoretical study of the effects of the next-nearest-neighbor (NNN) hopping () on the properties of non-interacting bosons in optical lattices in the presence of…
Lattice bosons in a quasi-disordered environment
R. Ramakumar, A. N. Das
In this paper, we study non-interacting bosons in a disordered one-dimensional optical lattice in a harmonic potential. We consider the case of deterministic disorder produced by a…
Two-step condensation of lattice bosons
R. Ramakumar, A. N. Das
We present a theoretical study of Bose-Einstein condensation in highly anisotropic harmonic traps. The bosons are considered to be moving in an optical lattice in an overall anisot…
Thermodynamic properties of Holstein polarons and the effects of disorder
A. N. Das, S. Sil
The ground state and finite temperature properties of polarons are studied considering a two-site and a four-site Holstein model by exact diagonalization of the Hamiltonian. The ki…
Lattice bosons in quartic confinement
R. Ramakumar, A. N. Das
We present a theoretical study of bose condensation of non-interacting bosons in finite lattices in quartic potentials in one, two, and three dimensions. We investigate dimensional…