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Browsing by Author "Pai, R.V."

Browsing by Author "Pai, R.V."

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  • Bose-Hubbard model in a strong effective magnetic field: Emergence of a chiral Mott insulator ground state 
    Dhar, A.; Maji, M.; Mishra, T.; Pai, R.V.; Mukerjee, S.; Paramekanti, A. (Physical Review A. 85(4); 2012; Article ID: 041602(R).)
    Motivated by experiments on Josephson junction arrays, and cold atoms in an optical lattice in a synthetic magnetic field, we study the "fully frustrated" Bose-Hubbard model with half a magnetic flux quantum per plaquette. ...
  • Bose-Hubbard models in confining potentials: Inhomogeneous mean-field theory 
    Pai, R.V.; Kurdestany, J.M.; Sheshadri, K.; Pandit, Rahul (Physical Review B. 85(21); 2012; Article ID: 214524.)
    An extensive study of Mott insulator (MI) and superfluid (SF) shells in Bose-Hubbard (BH) models for bosons in optical lattices with harmonic traps is presented. For this we apply the inhomogeneous mean-field theory ...
  • Chiral Mott insulator with staggered loop currents in the fully frustrated Bose-Hubbard model 
    Dhar, A.; Mishra, T.; Maji, M.; Pai, R.V.; Mukerjee, S.; Paramekanti, A. (Physical Review B. 87(17); 2013; Article no. 174501.)
    Motivated by experiments on Josephson junction arrays in a magnetic field and ultracold interacting atoms in an optical lattice in the presence of a "synthetic" orbital magnetic field, we study the "fully frustrated" ...
  • Cluster mean field plus density matrix renormalization theory for the Bose Hubbard models 
    Gaude, P.P.; Das, A.; Pai, R.V. (Journal of Physics A: Mathematical and Theoretical. 55(26); 2022; ArticleID_265004.)
    The cluster mean-field with density matrix renormalization (CMFT + DMRG) method which combines the simplicity of the mean-field theory and the numerical power of the density-matrix renormalization group method is applied ...
  • Cluster mean field theory for 2-dimensional spin-1 Bose Hubbard model 
    Alavani, B.K.; Das, A.; Pai, R.V. (Journal of Physics B: Atomic, Molecular and Optical Physics. 51(14); 2018; ArticleID_145302.)
    The Cluster Mean Field Theory(CMFT) for 2-dimensional Spin-1 Bose-Hubbard model is applied to study the superfluid (SF) to Mott insulator (MI) phase transitions and various magnetic phases, that arise in the presence of ...
  • Density-matrix renormalization group studies of mixture of two different ultracold bosonic atoms 
    Mishra, T.; Pai, R.V.; Das, B.P. (Journal of Physics: Conference Series. 80; 2007; Article ID 012039)
    We investigate the ground state phase diagram for a two species Bose mixture in a one dimensional optical lattice using the finite size density matrix renormalization group (FSDMRG) method. We present our result for different ...
  • Ground-state properties of linear-exchange quantum spin models 
    Danu, B.; BrijeshKumar; Pai, R.V. (EPL - Europhysics Letters. 100(2); 2012; Article ID: 27003.)
    We study a class of one-dimensional antiferromagnetic quantum spin-1/2 models using DMRG. The exchange interaction in these models decreases linearly with the separation between the spins, J(ij) = R - vertical bar i-j ...
  • Hard-core bosons in a zig-zag optical superlattice 
    Dhar, A.; Mishra, T.; Pai, R.V.; Mukerjee, S.; Das, B.P. (Physical Review A. 88(5); 2013; Article No. 053625 .)
    We study a system of hard-core bosons at half-filling in a one-dimensional optical superlattice. The bosons are allowed to hop to nearest- and next-nearest-neighbor sites. We obtain the ground-state phase diagram as a ...
  • Induced supersolidity in a mixture of normal and hard-core bosons 
    Mishra, T.; Pai, R.V.; Das, B.P. (Physical Review B. 81(2); 2010; Article ID: 024503.)
    We present a scenario where a supersolid is induced in one of the components of a mixture of two species bosonic atoms where there are no long-range interactions. We study a system of normal and hard-core boson mixture ...
  • The inhomogeneous extended Bose-Hubbard model: A mean-field theory 
    Kurdestany, J.M.; Pai, R.V.; Pandit, Rahul (Annalen Der Physik. 524(41702); 2012; 234-244.)
    We develop an inhomogeneous mean-field theory for the extended Bose-Hubbard model with a quadratic, confining potential. In the absence of this potential, our mean-field theory yields the phase diagram of the homogeneous ...
  • Mean-field analysis of quantum phase transitions in a periodic optical superlattice 
    Dhar, A.; Singh, M.; Pai, R.V.; Das, B.P. (Physical Review A. 84(3); 2011; Article ID: 033631.)
    We analyze the various phases exhibited by a system of ultracold bosons in a periodic optical superlattice using the mean-field decoupling approximation. We investigate for a wide range of commensurate and incommensurate ...
  • Melting of Mott Phases 
    Alavani, Bhargav Krishnanath
  • The one-dimensional extended Bose-Hubbard model 
    Pai, R.V.; Pandit, Rahul (Proceedings of the Indian Academy of Sciences-Chemical Sciences. 115(5and6); 2003; 721-726.)
    We use the finite-size, density-matrix-renormalization-group (DMRG) method to obtain the zero-temperature phase diagram of the one-dimensional, extended Bose-Hubbard model, for mean boson density rho = 1, in the U-V plane ...
  • Phase diagram of a bosonic ladder with two coupled chains 
    Luthra, M.S.; Mishra, T.; Pai, R.V.; Das, B.P. (Physical Review B. 78(16); 2008; Article ID: 165104)
    We study a bosonic ladder with two coupled chains using the finite-size density-matrix renormalization group method. We show that in a commensurate bosonic ladder the critical on-site interaction (U(C)) for the superfluid ...
  • Phase separation in a two-species Bose mixture 
    Mishra, T.; Pai, R.V.; Das, B.P. (Physical Review A. 76(1); 2007; Article ID: 013604.)
    We obtain the ground-state quantum phase diagram for a two-species Bose mixture in a one-dimensional optical lattice using the finite-size density-matrix renormalization group method. We discuss our results for different ...
  • Phase-separated charge-density-wave phase in the two-species extended Bose-Hubbard model 
    Mishra, T.; Sahoo, B.K.; Pai, R.V. (Physical Review A. 78(1); 2008; Article ID 013632)
    We study the quantum phase transitions in a two component Bose mixture in a one-dimensional optical lattice. The calculations have been performed in the framework of the extended Bose-Hubbard model using the finite size ...
  • Phases and transitions in the spin-1 Bose-Hubbard model: Systematics of a mean-field theory 
    Pai, R.V.; Sheshadri, K.; Pandit, Rahul (Physical Review B. 77(1); 2008; Article ID: 014503)
    We generalize the mean-field theory for the spinless Bose-Hubbard model to account for the different types of superfluid phases that can arise in the spin-1 case. In particular, our mean-field theory can distinguish polar ...
  • Quantum Phase Transitions in Quasi Crystals 
    Pawar, Swati Rajiv
  • Quantum phases and phase transitions of frustrated hard-core bosons on a triangular ladder 
    Mishra, T.; Pai, R.V.; Mukerjee, S.; Paramekanti, A. (Physical Review B. 87(17); 2013; Article ID. 174504.)
    Kinetically frustrated bosons at half filling in the presence of a competing nearest-neighbor repulsion support a wide supersolid regime on the two-dimensional triangular lattice. We study this model on a two-leg ladder ...
  • Quantum phases of attractive bosons on a Bose-Hubbard ladder with three-body constraint 
    Singh, M.; Mishra, T.; Pai, R.V.; Das, B.P. (Physical Review A. 90(1); 2014; Article No. 013625.)
    We obtain the complete quantum phase diagram of bosons on a two-leg ladder in the presence of attractive onsite and repulsive interchain nearest-neighbor interactions by imposing the onsite three-body constraint. We find ...