Publications (196)
Effects of local periodic driving on transport and generation of bound states
Adhip Agarwala, Diptiman Sen
We periodically kick a local region in a one-dimensional lattice and demonstrate, by studying wave packet dynamics, that the strength and the time period of the kicking can be used…
Granular topological insulators
Abhishek Banerjee, Oindrila Deb, Kunjalata Majhi +3
Granular conductors form an artificially engineered class of solid state materials wherein the microstructure can be tuned to mimic a wide range of otherwise inaccessible physical…
Non-equilibrium Green's function formalism and the problem of bound states
Abhishek Dhar, Diptiman Sen
The non-equilibrium Green's function formalism for infinitely extended reservoirs coupled to a finite system can be derived by solving the equations of motion for a tight-binding H…
Dynamical localization and slow thermalization in a class of disorder-free periodically driven one-dimensional interacting systems
Sreemayee Aditya, Diptiman Sen
We study if the interplay between dynamical localization and interactions in periodically driven quantum systems can give rise to anomalous thermalization behavior. Specifically, w…
Applications of the Collective Field Theory for the Calogero-Sutherland Model
Diptiman Sen, R. K. Bhaduri
We use the collective field theory known for the Calogero-Sutherland model to study a variety of low-energy properties. These include the ground state energy in a confining potenti…
Detection of a quantum particle on a lattice under repeated projective measurements
Shrabanti Dhar, Subinay Dasgupta, Abhishek Dhar +1
We consider a quantum particle, moving on a lattice with a tight-binding Hamiltonian, which is subjected to measurements to detect it's arrival at a particular chosen set of sites.…
Maximum group velocity in a one-dimensional model with a sinusoidally varying staggered potential
Tanay Nag, Diptiman Sen, Amit Dutta
We use Floquet theory to study the maximum value of the stroboscopic group velocity in a one-dimensional tight-binding model subjected to an on-site staggered potential varying sin…
Majorana modes and transport across junctions of superconductors and normal metals
Manisha Thakurathi, Oindrila Deb, Diptiman Sen
We study Majorana modes and transport in one-dimensional systems with a -wave superconductor (SC) and normal metal leads. For a system with a SC lying between two leads, it is k…
Dynamical relaxation of correlators in periodically driven integrable quantum systems
Sreemayee Aditya, Sutapa Samanta, Arnab Sen +2
We show that the correlation functions of a class of periodically driven integrable closed quantum systems approach their steady state value as , where is the n…
Quenching across quantum critical points in periodic systems: dependence of scaling laws on periodicity
Manisha Thakurathi, Wade DeGottardi, Diptiman Sen +1
We study the quenching dynamics of a many-body system in one dimension described by a Hamiltonian that has spatial periodicity. Specifically, we consider a spin-1/2 chain with equa…
Bosonic Mean Field Theory of the Spiral Phases of Heisenberg Antiferromagnets on a Chain
Sumathi Rao, Diptiman Sen
We develop a novel bosonic mean field theory to describe the spiral phases of a Heisenberg antiferromagnet on a one-dimensional chain, in terms of three bosons at each site. The gr…
Floquet scars and prethermal fragmentation in a driven spin-one chain
Krishanu Ghosh, Diptiman Sen, K. Sengupta
We study the periodic dynamics of a spin-one chain driven using a square-pulse protocol with amplitude and frequency . The Hamiltonian of the spin chain hosts a thermod…
Transport across a system with three p-wave superconducting wires: effects of Majorana modes and interactions
Oindrila Deb, Manisha Thakurathi, Diptiman Sen
We study the effects of Majorana modes and interactions between electrons on transport in a one-dimensional system with a junction of three p-wave superconductors (SCs) which are c…
Su-Schrieffer-Heeger model driven by sequences of two unitaries: periodic, quasiperiodic, aperiodic, and random protocols
Maitri Ganguli, Diptiman Sen
We study the effect of driving the Su-Schrieffer-Heeger model using two unitary operators and in different combinations; the unitaries differ in the values of the inter…
Floquet generation of Majorana end modes and topological invariants
Manisha Thakurathi, Aavishkar A. Patel, Diptiman Sen +1
We show how Majorana end modes can be generated in a one-dimensional system by varying some of the parameters in the Hamiltonian periodically in time. The specific model we conside…
Correlators and fractional statistics in the quantum Hall bulk
Smitha Vishveshwara, Michael Stone, Diptiman Sen
We derive single-particle and two-particle correlators of anyons in the presence of a magnetic field in the lowest Landau level. We show that the two-particle correlator exhibits s…
Magnetization of Mn_12 Ac in a slowly varying magnetic field: an ab initio study
Indranil Rudra, S. Ramasesha, Diptiman Sen
Beginning with a Heisenberg spin Hamiltonian for the manganese ions in the Mn_12 Ac molecule, we find a number of low-energy states of the system. We use these states to solve the…
Fibonacci steady states in a driven integrable quantum system
Somnath Maity, Utso Bhattacharya, Amit Dutta +1
We study an integrable system that is reducible to free fermions by a Jordan-Wigner transformation which is subjected to a Fibonacci driving protocol based on two non-commuting Ham…
Fidelity susceptibility of one-dimensional models with twisted boundary conditions
Manisha Thakurathi, Diptiman Sen, Amit Dutta
Recently it has been shown that the fidelity of the ground state of a quantum many-body system can be used to detect its quantum critical points (QCPs). If g denotes the parameter…
Exact results for quench dynamics and defect production in a two-dimensional model
K. Sengupta, Diptiman Sen, Shreyoshi Mondal
We show that for a d-dimensional model in which a quench with a rate Ï^{-1} takes the system across a d-m dimensional critical surface, the defect density scales as n \sim 1/Ï^{m…
Semiclassical analysis of two- and three-spin antiferromagnets and anyons on a sphere
Diptiman Sen
We do a semiclassical analysis for two or three spins which are coupled antiferromagnetically to each other. The semiclassical wave functions transform correctly under permutations…
Effective theories for quantum spin clusters: Geometric phases and state selection by singularity
Subhankar Khatua, Diptiman Sen, R. Ganesh
Magnetic systems with frustration often have large classical degeneracy. We show that their low-energy physics can be understood as dynamics within the space of classical ground st…
Effects of topological and non-topological edge states on information propagation and scrambling in a Floquet spin chain
Samudra Sur, Diptiman Sen
The action of any local operator on a quantum system propagates through the system carrying the information of the operator. This is usually studied via the out-of-time-order corre…
Transport on a topological insulator surface with a time-dependent magnetic barrier
Adithi Udupa, K. Sengupta, Diptiman Sen
We study transport across a time-dependent magnetic barrier present on the surface of a three-dimensional topological insulator. We show that such a barrier can be implemented for…
Coulomb gap in one-dimensional disordered electronic systems
Amit Dutta, Lars Fritz, Diptiman Sen
We study a one-dimensional system of spinless electrons in the presence of a long-range Coulomb interaction (LRCI) and a random chemical potential at each site. We first present a…
A Theoretical Approach for Computing Magnetic Anisotropy in Single Molecule Magnets
Rajamani Raghunathan, S. Ramasesha, Diptiman Sen
We present a theoretical approach to calculate the molecular magnetic anisotropy parameters, and for single molecule magnets in any eigenstate of the exchange Hamiltoni…
Electron dynamics in graphene with spin-orbit couplings and periodic potentials
Ranjani Seshadri, Diptiman Sen
We use both continuum and lattice models to study the energy-momentum dispersion and the dynamics of a wave packet for an electron moving in graphene in the presence of spin-orbit…
Magnetic properties of a helical spin chain with alternating isotropic and anisotropic spins: magnetization plateaus and finite entropy
V. Ravi Chandra, S. Ramasesha, Diptiman Sen
We study a model which could explain some of the unusual magnetic properties observed for the one-dimensional helical spin system Co(hfac)_2 NITPhOMe. One of the properties observe…
Heating suppression via two-rate random and quasiperiodic drive protocols
Krishanu Ghosh, Sayan Choudhury, Diptiman Sen +1
We study a random and quasiperiodically driven one-dimensional non-integrable PXP spin chain in a magnetic field for two distinct drive protocols. Each of these protocols involves…
Nonequilibrium charge transport in an interacting open system: two-particle resonance and current asymmetry
Dibyendu Roy, Abhiram Soori, Diptiman Sen +1
We use Lippman-Schwinger scattering theory to study nonequilibrium electron transport through an interacting open quantum dot. The two-particle current is evaluated exactly while w…
Phase Diagram of the Spin-One Heisenberg System with Dimerization and Frustration
Swapan Pati, R. Chitra, Diptiman Sen +2
We use the density matrix renormalization group method to study the ground state properties of an antiferromagnetic spin- chain with a next-nearest neighbor exchange and…
Power dissipation for systems with junctions of multiple quantum wires
Amit Agarwal, Sourin Das, Diptiman Sen
We study power dissipation for systems of multiple quantum wires meeting at a junction, in terms of a current splitting matrix (M) describing the junction. We present a unified fra…
Exact and Approximate Theoretical Techniques for Quantum Magnetism in Low Dimensions
Swapan K. Pati, S. Ramasesha, Diptiman Sen
Quantum magnetism in low dimensions has been one of the central areas of theoretical research for many decades now. One of the key reasons for the long standing interest in this fi…
Probing the Topological Anderson Transition in Quasiperiodic Photonic Lattices via Chiral Displacement and Wavelength Tuning
Abhinav Sinha, Trideb Shit, Avinash Tetarwal +2
The interplay of topology and disorder in quantum dynamics has recently attracted significant attention across diverse platforms, including solid-state devices, ultracold atoms, an…
Dynamical localization in a chain of hard core bosons under a periodic driving
Tanay Nag, Sthitadhi Roy, Amit Dutta +1
We study the dynamics of a one-dimensional lattice model of hard core bosons which is initially in a superfluid phase with a current being induced by applying a twist at the bounda…
Modified DMRG algorithm for the zigzag spin-1/2 chain with frustrated antiferromagnetic exchange: Comparison with field theory at large
Manoranjan Kumar, Zoltan G. Soos, Diptiman Sen +1
A modified density matrix renormalization group (DMRG) algorithm is applied to the zigzag spin-1/2 chain with frustrated antiferromagnetic exchange , between first and s…
Quantum fidelity for one-dimensional Dirac fermions and two-dimensional Kitaev model in the thermodynamic limit
Victor Mukherjee, Amit Dutta, Diptiman Sen
We study the scaling behavior of the fidelity () in the thermodynamic limit using the examples of a system of Dirac fermions in one dimension and the Kitaev model on a honeycomb…
Field Theoretic Studies of Quantum Spin Systems in One Dimension
Diptiman Sen
We describe some field theoretic methods for studying quantum spin systems in one dimension. These include the nonlinear sigma-model approach which is particularly useful for large…
Quenching across quantum critical points: role of topological patterns
Diptiman Sen, Smitha Vishveshwara
We introduce a one-dimensional version of the Kitaev model consisting of spins on a two-legged ladder and characterized by Z_2 invariants on the plaquettes of the ladder. We map th…
Transport across junctions of pseudospin-one fermions
Sourav Nandy, K. Sengupta, Diptiman Sen
We study transport across ballistic junctions of materials which host pseudospin-one fermions as emergent low-energy quasiparticles. The effective low-energy Hamiltonians of such f…
Edge states, spin transport and impurity induced local density of states in spin-orbit coupled graphene
Ranjani Seshadri, K. Sengupta, Diptiman Sen
We study graphene which has both spin-orbit coupling (SOC), taken to be of the Kane-Mele form, and a Zeeman field induced due to proximity to a ferromagnetic material. We show that…
Spin-1 chain with spin-1/2 excitations in the bulk
Diptiman Sen, Naveen Surendran
We present a spin-1 chain with a Hamiltonian which has three exactly solvable ground states. Two of these are fully dimerized, analogous to the Majumdar-Ghosh (MG) states of a spin…
Quenching Dynamics of a quantum XY spin-1/2 chain in presence of a transverse field
Victor Mukherjee, Uma Divakaran, Amit Dutta +1
We study the quantum dynamics of a one-dimensional spin-1/2 anisotropic XY model in a transverse field when the transverse field or the anisotropic interaction is quenched at a slo…
Semiclassical and field theoretic studies of Heisenberg antiferromagnetic chains with frustration and dimerization
Sumathi Rao, Diptiman Sen
The Heisenberg antiferromagnetic spin chain with both dimerization and frustration is studied. The classical ground state has three phases (a Neel phase, a spiral phase and a colin…
Restoring coherence via aperiodic drives in a many-body quantum system
Bhaskar Mukherjee, Arnab Sen, Diptiman Sen +1
We study the unitary dynamics of randomly or quasi-periodically driven tilted Bose-Hubbard (tBH) model in one dimension deep inside its Mott phase starting from a sy…
Equation of motion approach to non-adiabatic quantum charge pumping
Amit Agarwal, Diptiman Sen
We use the equations of motion of non-interacting electrons in a one-dimensional system to numerically study different aspects of charge pumping. We study the effects of the pumpin…
Scattering of electrons from an interacting region
Abhishek Dhar, Diptiman Sen, Dibyendu Roy
We address the problem of transmission of electrons between two noninteracting leads through a region where they interact (quantum dot). We use a model of spinless electrons hoppin…
Second quantization of anyons and spin-anyon duality
Priyanshi Bhasin, Diptiman Sen, Tanmoy Das
Anyons exhibit a non-trivial interplay between local exclusion rules and non-local braiding and exchange phases, making a consistent commutation algebra and second-quantized formul…
Refraction Hall Effect
Ronika Sarkar, Arka Bandyopadhyay, Awadhesh Narayan +1
We introduce a new mechanism that produces a Hall-like response in time-reversal-invariant materials, driven entirely by geometric effects. Specifically, we demonstrate that a tilt…
Quantum dynamics of a spin model with an extensive degeneracy
Krishanu Ghosh, Diptiman Sen, K. Sengupta
We study the role played by extensive degeneracy in shaping the nature of the quantum dynamics of a one-dimensional spin model for both ramp and periodic drive protocols. The model…
Clusters of bound particles in a quantum integrable many-body system and number theory
B. Basu-Mallick, Tanaya Bhattacharyya, Diptiman Sen
We construct clusters of bound particles for a quantum integrable derivative delta-function Bose gas in one dimension. It is found that clusters of bound particles can be construct…
Infinite-range Ising ferromagnet in a time-dependent transverse field: quench and ac dynamics near the quantum critical point
Arnab Das, K. Sengupta, Diptiman Sen +1
We study an infinite range ferromagnetic Ising model in the presence of a transverse magnetic field which exhibits a quantum paramagnetic-ferromagnetic phase transition at a critic…
One-dimensional fermions with incommensurate hopping close to dimerization
Diptiman Sen, Siddhartha Lal
We study the spectrum of fermions hopping on a chain with a weak incommensuration close to dimerization; both q, the deviation of the wave number from pi, and delta, the strength o…
Dynamics of quasiperiodically driven spin systems
Sayak Ray, Subhasis Sinha, Diptiman Sen
We study the stroboscopic dynamics of a spin- object subjected to -function kicking in the transverse magnetic field which is generated following the Fibonacci sequence. The…
Novel correlations in two dimensions: Some exact solutions
M. V. N. Murthy, R. K. Bhaduri, Diptiman Sen
We construct a new many-body Hamiltonian with two- and three-body interactions in two space dimensions and obtain its exact many-body ground state for an arbitrary number of partic…
Generating surface states in a Weyl semi-metal by applying electromagnetic radiation
Oindrila Deb, Diptiman Sen
We show that the application of circularly polarized electromagnetic radiation on the surface of a Weyl semi-metal can generate states at that surface. These states can be characte…
Renormalization group study of the conductances of interacting quantum wire systems with different geometries
Sourin Das, Sumathi Rao, Diptiman Sen
We examine the effect of interactions between the electrons on the conductances of some systems of quantum wires with different geometries. The systems include a wire with a stub i…
Conductance through contact barriers of a finite length quantum wire
Siddhartha Lal, Sumathi Rao, Diptiman Sen
We use the technique of bosonization to understand a variety of recent experimental results on the conductivity of a quantum wire. The quantum wire is taken to be a finite-length L…
Thomas-Fermi Method For Particles Obeying Generalized Exclusion Statistics
Diptiman Sen, R. K. Bhaduri
We use the Thomas-Fermi method to examine the thermodynamics of particles obeying Haldane exclusion statistics. Specifically, we study Calogero-Sutherland particles placed in a giv…
Dynamics of the vacuum state in a periodically driven Rydberg chain
Bhaskar Mukherjee, Arnab Sen, Diptiman Sen +1
We study the dynamics of the periodically driven Rydberg chain starting from the state with zero Rydberg excitations (vacuum state denoted by ) using a square pulse prot…
Junction of several weakly interacting quantum wires: a renormalization group study
Siddhartha Lal, Sumathi Rao, Diptiman Sen
We study the conductance of three or more semi-infinite wires which meet at a junction. The electrons in the wires are taken to interact weakly with each other through a short-rang…
Spin-1 Kitaev model in one dimension
Diptiman Sen, R. Shankar, Deepak Dhar +1
We study a one-dimensional version of the Kitaev model on a ring of size N, in which there is a spin S > 1/2 on each site and the Hamiltonian is J \sum_i S^x_i S^y_{i+1}. The cases…
Exact Entanglement Studies of Strongly Correlated Systems: Role of Long-Range Interactions and Symmetries of the System
Shaon Sahoo, V. M. L. Durga Prasad Goli, S. Ramasesha +1
We study the bipartite entanglement of strongly correlated systems using exact diagonalization techniques. In particular, we examine how the entanglement changes in the presence of…
Detecting prethermal Floquet phases of Rydberg atom arrays
Somsubhra Ghosh, Diptiman Sen, K. Sengupta
We study the prethermal Floquet phases of a two-dimensional (2D) Rydberg atom array on a rectangular lattice in the presence of a periodic drive with large drive amplitude. We deri…
Clusters of bound particles in the derivative delta-function Bose gas
B. Basu-Mallick, Tanaya Bhattacharyya, Diptiman Sen
In this paper we discuss a novel procedure for constructing clusters of bound particles in the case of a quantum integrable derivative delta-function Bose gas in one dimension. It…
A Solvable Model of Interacting Fermions in Two Dimensions
B. Sriram Shastry, Diptiman Sen
We introduce and study an exactly solvable model of several species of fermions in which particles interact pairwise through a mutual magnetic field; the interaction operates only…
Bosonization study of a generalized statistics model with four Fermi points
Sreemayee Aditya, Diptiman Sen
We study a one-dimensional lattice model of fractional statistics in which particles have next-nearest-neighbor hopping between sites which depends on the occupation number at the…
Model Exact Low-Lying States and Spin Dynamics in Ferric Wheels; Fe to Fe
Indranil Rudra, S. Ramasesha, Diptiman Sen
Using an efficient numerical scheme that exploits spatial symmetries and spin-parity, we have obtained the exact low-lying eigenstates of exchange Hamiltonians for ferric wheels up…
Majorana Fermions in superconducting 1D systems having periodic, quasiperiodic, and disordered potentials
Wade DeGottardi, Diptiman Sen, Smitha Vishveshwara
We present a unified study of the effect of periodic, quasiperiodic and disordered potentials on topological phases that are characterized by Majorana end modes in 1D p-wave superc…
A Bosonic Mean-Field Theory for Frustrated Heisenberg Antiferromagnets in Two Dimensions
R. Chitra, Sumathi Rao, Diptiman Sen
We use a recently developed bosonic mean-field theory (MFT) to study the ordered ground states of frustrated Heisenberg antiferromagnets (FHAFM) in two dimensions. We emphasize the…
Driven Hubbard model on a triangular lattice: tunable Heisenberg antiferromagnet with three-spin chiral term
Samudra Sur, Adithi Udupa, Diptiman Sen
We study the effects of a periodically varying electric field on the Hubbard model at half-filling on a triangular lattice. The electric field is incorporated through the phase of…
A multispecies Calogero-Sutherland model
Diptiman Sen
Motivated by the concept of ideal mutual statistics, we study a multispecies Calogero-Sutherland model in which the interaction parameters and masses satisfy some specific relation…
Driven quantum many-body systems and out-of-equilibrium topology
Souvik Bandyopadhyay, Sourav Bhattacharjee, Diptiman Sen
In this review we present some of the work done in India in the area of driven and out-of-equilibrium systems with topological phases. After presenting some well-known examples of…
Perturbation Theory for Singular Potentials in Quantum Mechanics
Diptiman Sen
We study perturbation theory in certain quantum mechanics problems in which the perturbing potential diverges at some points, even though the energy eigenvalues are smooth function…
Line junction in a quantum Hall system with two filling fractions
Diptiman Sen, Amit Agarwal
We present a microscopic model for a line junction formed by counter or co-propagating single mode quantum Hall edges corresponding to different filling factors. The ends of the li…
Field theoretical study of a spin-1/2 ladder with unequal chain exchanges
Sujit Sarkar, Diptiman Sen
We study the low-energy properties of a Heisenberg spin-1/2 zigzag ladder with different exchange constants on the two chains. Using a nonlinear sigma-model field theory and abelia…
Study of Low-energy States of Clusters of Spin-1/2 and Spin-1 Triangles with Kagome-like Geometries
Indranil Rudra, S. Ramasesha, Diptiman Sen
We study the low-energy properties of Heisenberg antiferromagnetic spin-1/2 and spin-1 systems on various clusters made up of triangles. Some of the clusters have a geometry simila…
An introduction to bosonization and aome of its applications
Sumathi Rao, Diptiman Sen
We discuss the technique of bosonization for studying systems of interacting fermions in one dimension. After briefly reviewing the low-energy properties of Fermi and Luttinger liq…
Model of resistances in systems of Tomonaga-Luttinger liquid wires
Abhiram Soori, Diptiman Sen
In a recent paper, we combined the technique of bosonization with the concept of a Rayleigh dissipation function to develop a model for resistances in one-dimensional systems of in…
Quenching along a gapless line: A different exponent for defect density
Uma Divakaran, Amit Dutta, Diptiman Sen
We use a new quenching scheme to study the dynamics of a one-dimensional anisotropic spin-1/2 chain in the presence of a transverse field which alternates between the values $…
A comparative study of the phase diagrams of spin- and spin- antiferromagnetic chains with dimerization and frustration
Swapan Pati, R. Chitra, Diptiman Sen +2
We use the density matrix renormalization group method to study the ground state `phase' diagram and some low-energy properties of isotropic antiferromagnetic spin- and…
Quantum phases of dimerized and frustrated Heisenberg spin chains with s = 1/2, 1 and 3/2: an entanglement entropy and fidelity study
V. M. L. Durga Prasad Goli, Shaon Sahoo, S. Ramasesha +1
We study here different regions in phase diagrams of the spin-1/2, spin-1 and spin-3/2 one dimensional antiferromagnetic Heisenberg systems with frustration (next-nearest-neighbor…
Properties of low-lying states in some high-nuclearity Mn, Fe and V clusters: Exact studies of Heisenberg models
C. Raghu, Indranil Rudra, Diptiman Sen +1
Using an efficient numerical scheme that exploits spatial symmetries and spin parity, we have obtained the exact low-lying eigenstates of exchange Hamiltonians for the high nuclear…
Mechanisms of scrambling and unscrambling of quantum information in the ground state in spin chains: domain-walls, spin-flips and scattering phase shifts
Samudra Sur, Diptiman Sen
The spatiotemporal evolution of the out-of-time-order correlator (OTOC) measures the propagation and scrambling of local quantum information. For the transverse field Ising model w…
Density functional theory of the fractional quantum Hall effect
Jianyun Zhao, Manisha Thakurathi, Manish Jain +2
A conceptual difficulty in formulating the density functional theory of the fractional quantum Hall effect is that while in the standard approach the Kohn-Sham orbitals are either…
Junction between surfaces of two topological insulators
Diptiman Sen, Oindrila Deb
We study the properties of a line junction which separates the surfaces of two three-dimensional topological insulators. The velocities of the Dirac electrons on the two surfaces m…
Fully Symmetrized VB Based Technique for Solving Exchange Hamiltonians of Molecular Magnets
Shaon Sahoo, Raghunathan Rajamani, S. Ramasesha +1
Generally, the first step in modeling molecular magnets involves obtaining the low-lying eigenstates of a Heisenberg exchange Hamiltonian which conserves total spin and belongs usu…
Gapless points of dimerized quantum spin chains: analytical and numerical studies
V. Ravi Chandra, Diptiman Sen, Naveen Surendran
We study the locations of the gapless points which occur for quantum spin chains of finite length (with a twisted boundary condition) at particular values of the nearest neighbor d…
A DMRG Study of Low-Energy Excitations and Low-Temperature Properties of Alternating Spin Systems
Swapan K. Pati, S. Ramasesha, Diptiman Sen
We use the density matrix renormalization group (DMRG) method to study the ground and low-lying excited states of three kinds of uniform and dimerized alternating spin chains. The…
Novel multi-band quantum soliton states for a derivative nonlinear Schrodinger model
B. Basu-Mallick, Tanaya Bhattacharyya, Diptiman Sen
We show that localized N-body soliton states exist for a quantum integrable derivative nonlinear Schrodinger model for several non-overlapping ranges (called bands) of the coupling…
Thermodynamic behavior of modified integer-spin Kitaev models on the honeycomb lattice
Owen Bradley, Jaan Oitmaa, Diptiman Sen +1
We study the thermodynamic properties of modified spin- Kitaev models introduced by Baskaran, Sen and Shankar (Phys. Rev. B 78, 115116 (2008)). These models have the property th…
Signatures and conditions for phase band crossings in periodically driven integrable systems
Bhaskar Mukherjee, Arnab Sen, Diptiman Sen +1
We present generic conditions for phase band crossings for a class of periodically driven integrable systems represented by free fermionic models subjected to arbitrary periodic dr…
Weak universality, quantum many-body scars and anomalous infinite-temperature autocorrelations in a one-dimensional spin model with duality
Adithi Udupa, Samudra Sur, Sourav Nandy +2
We study a one-dimensional spin- model with three-spin interactions and a transverse magnetic field . The model has a symmetry, and a duality between a…
Studies on a frustrated Heisenberg spin chain with alternating ferromagnetic and antiferromagnetic exchanges
Shaon Sahoo, V. M. L. Durga Prasad Goli, Diptiman Sen +1
We study Heisenberg spin-1/2 and spin-1 chains with alternating ferromagnetic () and antiferromagnetic () nearest-neighbor interactions and a ferromagnetic next-neare…
Disconnected entanglement entropy as a marker of edge modes in a periodically driven Kitaev chain
Saikat Mondal, Diptiman Sen, Amit Dutta
We study the disconnected entanglement entropy (DEE) of a Kitaev chain in which the chemical potential is periodically modulated with -function pulses within the framework of F…
DMRG study of scaling exponents in spin-1/2 Heisenberg chains with dimerization and frustration
Manoranjan Kumar, S. Ramasesha, Diptiman Sen +1
In conformal field theory, key properties of spin-1/2 chains, such as the ground state energy per site and the excitation gap scale with dimerization delta as delta^alpha with know…
Quantization of the Derivative Nonlinear Schrodinger Equation
Diptiman Sen
We study the quantum mechanics of the derivative nonlinear Schrodinger equation which has appeared in many areas of physics and is known to be classically integrable. We find that…
Study of an Antiferromagnetic Sawtooth Chain with Spin-1/2 and Spin-1 sites
V. Ravi Chandra, Diptiman Sen, N. B. Ivanov +1
We study the low-energy properties of a sawtooth chain with spin-1's at the bases of the triangles and spin-1/2's at the vertices of the triangles. The spins have Heisenberg antife…
Novel correlations in two dimensions: Two-body problem
R. K. Bhaduri, Avinash Khare, J. Law +2
We discuss a many-body Hamiltonian with two- and three-body interactions in two dimensions introduced recently by Murthy, Bhaduri and Sen. Apart from an analysis of some exact solu…
Periodically driven model with quasiperiodic potential and staggered hopping amplitudes: engineering of mobility gaps and multifractal states
Sreemayee Aditya, K. Sengupta, Diptiman Sen
We study if periodic driving of a model with a quasiperiodic potential can generate interesting Floquet phases which have no counterparts in the static model. Specifically, we cons…