D. Angom
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View article: Disordered solid to Bose-glass transition in Bose-Hubbard model with disorder and long-range interactions
Disordered solid to Bose-glass transition in Bose-Hubbard model with disorder and long-range interactions Open
The introduction of disorder in Bose-Hubbard model gives rise to new glassy quantum phases, namely the Bose-glass (BG) and disordered solid (DS) phases. In this work, we present the rich phase diagram of interacting bosons in disordered tw…
View article: Fock-space perturbed relativistic coupled-cluster calculations of electric dipole polarizability and nuclear spin-dependent parity non-conservation in Cs
Fock-space perturbed relativistic coupled-cluster calculations of electric dipole polarizability and nuclear spin-dependent parity non-conservation in Cs Open
We implement the Fock-space perturbed relativistic coupled-cluster theory to compute the electric dipole polarizability of ground and low lying excited states, and nuclear spin-dependent parity violating (NSD-PNC) transition amplitudes in …
View article: Fock-space relativistic coupled-cluster calculations of clock transition properties in Pb$^{2+}$
Fock-space relativistic coupled-cluster calculations of clock transition properties in Pb$^{2+}$ Open
We have implemented an all-particle multireference Fock-space relativistic coupled-cluster theory to probe $6s^2{\;^1}S_{0} - 6s6p{\;^3P^o_{0}}$ clock transition in an even isotope of Pb$^{2+}$. We have computed, excitation energy for seve…
View article: Quench dynamics across the MI-SF quantum phase transition with cluster mean field theory
Quench dynamics across the MI-SF quantum phase transition with cluster mean field theory Open
In this work, we study the quench dynamics of quantum phases of ultracold neutral bosons trapped in optical lattices. We investigate the validity of the Kibble-Zurek (KZ) scaling laws with the single-site Gutzwiller mean-field (SGMF) and c…
View article: Exact diagonalization using hierarchical wave functions and calculation of topological entanglement entropy
Exact diagonalization using hierarchical wave functions and calculation of topological entanglement entropy Open
In this work we describe a new technique for numerical exact diagonalization. The method is particularly suitable for cold bosonic atoms in optical lattices, in which multiple atoms can occupy a lattice site. We describe the use of the met…
View article: Out-of-equilibrium dynamics of Bose-Bose mixtures in optical lattices
Out-of-equilibrium dynamics of Bose-Bose mixtures in optical lattices Open
We examine the quench dynamics across quantum phase transitions from a Mott insulator (MI) to a superfluid (SF) phase in a two-component bosonic mixture in an optical lattice. We show that two-component Bose mixtures exhibit qualitatively …
View article: Fractional quantum Hall effect in optical lattices
Fractional quantum Hall effect in optical lattices Open
In this research, we study the bosonic fractional quantum Hall (FQH) states in a system of ultracold bosons in a two-dimensional optical lattice in the presence of a synthetic magnetic field, described by the bosonic Harper–Hofstadter Hami…
View article: Quantum phases of dipolar bosons in a multilayer optical lattice
Quantum phases of dipolar bosons in a multilayer optical lattice Open
We consider a minimal model to investigate the quantum phases of hardcore, polarized dipolar atoms confined in multilayer optical lattices. The model is a variant of the extended Bose-Hubbard model, which incorporates intralayer repulsion …
View article: Fock-space perturbed relativistic coupled-cluster theory for electric dipole polarizability of one-valence atomic systems: Application to Al and In
Fock-space perturbed relativistic coupled-cluster theory for electric dipole polarizability of one-valence atomic systems: Application to Al and In Open
We have developed a Fock-space relativistic coupled-cluster theory based\nmethod for the calculation of electric dipole polarizability of one-valence\natoms and ions. We employ this method to compute the ground-state and\nspin-orbit couple…
View article: Fine-grained domain counting and percolation analysis in 2D lattice systems with linked-lists
Fine-grained domain counting and percolation analysis in 2D lattice systems with linked-lists Open
We present a fine-grained approach to identify clusters and perform percolation analysis in a 2D lattice system. In our approach, we develop an algorithm based on the linked-list data structure whereby the members of a cluster are nodes of…
View article: Spin-orbit-coupling-driven superfluid states in optical lattices at zero and finite temperatures
Spin-orbit-coupling-driven superfluid states in optical lattices at zero and finite temperatures Open
We investigate the quantum phase transitions of a two-dimensional Bose-Hubbard model in the presence of a Rashba spin-orbit coupling with and without thermal fluctuations. The interplay of single-particle hopping, strength of spin-orbit co…
View article: Quantum phases of dipolar bosons in multilayer optical lattice
Quantum phases of dipolar bosons in multilayer optical lattice Open
We consider a minimal model to investigate the quantum phases of hardcore, polarized dipolar atoms confined in multilayer optical lattices. The model is a variant of the extended Bose-Hubbard model, which incorporates intralayer repulsion …
View article: Quantum quench dynamics of tilted dipolar bosons in 2D optical lattices
Quantum quench dynamics of tilted dipolar bosons in 2D optical lattices Open
We investigate the quench dynamics of the dipolar bosons in two dimensional optical lattice of square geometry using the time dependent Gutzwiller method. The system exhibits different density orders like the checkerboard and the striped p…
View article: Spin-orbit coupling driven superfluid states in optical lattices at zero\n and finite temperatures
Spin-orbit coupling driven superfluid states in optical lattices at zero\n and finite temperatures Open
We investigate the quantum phase transitions of a two-dimensional\nBose-Hubbard model in the presence of a Rashba spin-orbit coupling with and\nwithout thermal fluctuations. The interplay of single-particle hopping,\nstrength of spin-orbit…
View article: Dynamics of the Creation of a Rotating Bose–Einstein Condensation by Two Photon Raman Transition Using a Laguerre–Gaussian Laser Pulse
Dynamics of the Creation of a Rotating Bose–Einstein Condensation by Two Photon Raman Transition Using a Laguerre–Gaussian Laser Pulse Open
We present numerical simulations to unravel the dynamics associated with the creation of a vortex in a Bose–Einstein condensate (BEC), from another nonrotating BEC using two-photon Raman transition with Gaussian (G) and Laguerre–Gaussian (…
View article: Staggered superfluid phases of dipolar bosons in two-dimensional square lattices
Staggered superfluid phases of dipolar bosons in two-dimensional square lattices Open
We study the quantum ground state of ultracold bosons in a two-dimensional\nsquare lattice. The bosons interact via the repulsive dipolar interactions and\ns-wave scattering. The dynamics is described by the extended Bose-Hubbard model\nin…
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: Segregated quantum phases of dipolar bosonic mixtures in two-dimensional optical lattices
Segregated quantum phases of dipolar bosonic mixtures in two-dimensional optical lattices Open
We identify the quantum phases in a binary mixture of dipolar bosons in two-dimensional optical lattices. Our study is motivated by the recent experimental realization of binary dipolar condensate mixtures of Er-Dy [Phys. Rev. Lett. 121, 2…
View article: Supersolid phase of the extended Bose-Hubbard model with an artificial gauge field
Supersolid phase of the extended Bose-Hubbard model with an artificial gauge field Open
We examine the zero and finite temperature phase diagrams of soft-core bosons of the extended Bose-Hubbard model on a square optical lattice. To study various quantum phases and their transitions we employ single-site and cluster Gutzwille…
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: Electric dipole polarizability of group-13 ions using perturbed relativistic coupled-cluster theory: Importance of nonlinear terms
Electric dipole polarizability of group-13 ions using perturbed relativistic coupled-cluster theory: Importance of nonlinear terms Open
We compute the ground-state electric dipole polarizability of group-IIIA ions\nusing the perturbed relativistic coupled-cluster (PRCC) theory. To account for\nthe relativistic effects and QED corrections, we use the Dirac-Coulomb-Breit\nHa…
View article: Quantum phases of canted dipolar bosons in a two-dimensional square optical lattice
Quantum phases of canted dipolar bosons in a two-dimensional square optical lattice Open
We consider a minimal model to describe the quantum phases of ultracold\ndipolar bosons in two-dimensional (2D) square optical lattices. The model is a\nvariation of the extended Bose-Hubbard model and apt to study the quantum\nphases aris…
View article: Splitting of singly and doubly quantized composite vortices in two-component Bose-Einstein condensates
Splitting of singly and doubly quantized composite vortices in two-component Bose-Einstein condensates Open
We study numerically the dynamical instabilities and splitting of singly and\ndoubly quantized composite vortices in two-component Bose-Einstein condensates\nharmonically confined to quasi two dimensions. In this system, the vortices\nbeco…
View article: Dynamics of the creation of a rotating Bose-Einstein condensate by two-photon Raman transition using Laguerre-Gaussian pulse
Dynamics of the creation of a rotating Bose-Einstein condensate by two-photon Raman transition using Laguerre-Gaussian pulse Open
We examine the dynamics associated with the creation of a vortex in a Bose-Einstein condensate (BEC), from another nonrotating BEC using two-photon Raman transition with Gaussian (G) and Laguerre-Gaussian (LG) laser pulses. In particular, …
View article: Enhancement of the Bose glass phase in the presence of an artificial gauge field
Enhancement of the Bose glass phase in the presence of an artificial gauge field Open
We examine the effects of an artificial gauge field and finite temperature in\na two-dimensional disordered Bose-Hubbard model. The disorder considered is\ndiagonal and quenched in nature. A signature of disorder in the Bose-Hubbard\nmodel…
View article: Supersolid phase of the extended Bose-Hubbard model with an artificial gauge field
Supersolid phase of the extended Bose-Hubbard model with an artificial gauge field Open
We examine the zero and finite temperature phase diagrams of soft-core bosons of the extended Bose-Hubbard model on a square optical lattice. To study various quantum phases and their transitions we employ single-site and cluster Gutzwille…
View article: Bosonic quantum Hall states in single-layer two-dimensional optical lattices
Bosonic quantum Hall states in single-layer two-dimensional optical lattices Open
Quantum Hall (QH) states of 2D single layer optical lattices are examined\nusing Bose-Hubbard model (BHM) in presence of artificial gauge field. We study\nthe QH states of both the homogeneous and inhomogeneous systems. For the\nhomogeneou…
View article: Enhancement of the Bose glass phase in the presence of an artificial gauge field
Enhancement of the Bose glass phase in the presence of an artificial gauge field Open
We examine the effects of an artificial gauge field and finite temperature in a two-dimensional disordered Bose-Hubbard model. The disorder considered is diagonal and quenched in nature. A signature of disorder in the Bose-Hubbard model is…