Publications (89)
Quantum Phase Analysis of Extended Bose-Hubbard Model
Manoranjan Kumar, Sujit Sarkar, S. Ramasesha
We have obtained the quantum phase diagram of one dimensional extended Bose-Hubbard model using the density-matrix renormalization group and Abelian bosonization methods for differ…
Modeling the spin-Peierls transition of spin- chains with correlated states: model, CuGeO and TTF-CuSC(CF)
Sudip Kumar Saha, Monalisa Singh Roy, Manoranjan Kumar +1
The spin-Peierls transition at of spin- chains with isotropic exchange interactions has previously been modeled as correlated for and mean field for $T <…
Speed inhomogeneity accelerates the information transfer in polar flock
Sudipta Pattanayak, Jay Prakash Singh, Manoranjan Kumar +1
A collection of self-propelled particles (SPPs) shows coherent motion and exhibits a true long range ordered (LRO) state in two dimensions. Various studies show that the presence o…
DMRG study of scaling exponents in spin-1/2 Heisenberg chains with dimerization and frustration
Manoranjan Kumar, S. Ramasesha, Diptiman Sen +1
In conformal field theory, key properties of spin-1/2 chains, such as the ground state energy per site and the excitation gap scale with dimerization delta as delta^alpha with know…
A long-range model for the electron-nuclear coupling and two-stage order in TmVO
Sayan Ghosh, Anirudha Menon, Manoranjan Kumar +1
We study an infinite-range coupled electronic-quadrupole and nuclear-spin model for ferro-quadrupolar and nuclear-spin ordering in TmVO in external magnetic and strain fields.…
Multipolar phase in frustrated spin-1/2 and 1 chains
Aslam Parvej, Manoranjan Kumar
The spin chain model with nearest neighbor and next nearest neighbor anti-ferromagnetic interaction is one of the most popular frustrated magnetic models. Thi…
Emergent Quadrupolar Order in the Spin- Kitaev-Heisenberg Model
Manodip Routh, Sayan Ghosh, Jeroen van den Brink +2
Motivated by the largely unexplored domain of multi-polar ordered spin states in the Kitaev-Heisenberg (KH) systems we investigate the ground state dynamics of the spin-$\frac{1}{2…
Exploring magnetic and topological complexity in MgMnSn: from frustrated ground states to nontrivial Hall conductivity
Jyotirmoy Sau, Hrishit Banerjee, Sourabh Saha +2
We explore the intriguing topological itinerant magnet MgMnSn, characterized by bilayer kagome Mn layers encasing a hexagonal Sn layer. Using \textit{ab initio} Density fun…
Bond-bond correlations, gap relations and thermodynamics of spin- chains with spin-Peierls transitions and bond-order-wave phases
Sudip Kumar Saha, Manoranjan Kumar, Zoltán G. Soos
The spin- chain with antiferromagnetic exchange and between first and second neighbors, respectively, has both gapless and gapped () quantum ph…
Boundary-induced spin density waves in linear Heisenberg antiferromagnetic spin chains with
Dayasindhu Dey, Manoranjan Kumar, Zoltán G. Soos
Linear Heisenberg antiferromagnets (HAFs) are chains of spin- sites with isotropic exchange between neighbors. Open and periodic boundary conditions return the same ground s…
Haldane and Dimer phases in a frustrated spin chain: an exact groundstate and associated topological phase transition
Shaon Sahoo, Dayasindhu Dey, Sudip Kumar Saha +1
A Heisenberg spin- chain with alternating ferromagnetic () and antiferromagnetic () nearest-neighbor (NN) interactions, exhibits the Dimer and spin- Halda…
Machine learning approach to study quantum phases of a frustrated one dimensional spin-1/2 system
Sk Saniur Rahaman, Sumit Haldar, Manoranjan Kumar
Frustration driven quantum fluctuation leads to many exotic phases in the ground state and study of these quantum phase transitions is one of the most challenging areas of research…
Inter-chain Interactions, Multi-magnon condensation and Strain effect in chain compound NaVOPO
Manoj Gupta, Manodip Routh, Manoranjan Kumar +1
Employing first-principles modelling and many-body methods, the magnetic properties of spin-1/2 chain compound NaVOPO are explored. The extensive first-principles calculations…
Density matrix renormalization group algorithm for Bethe lattices of spin 1/2 or 1 sites with Heisenberg antiferromagnetic exchange
Manoranjan Kumar, S. Ramasesha, Zoltan G. Soos
An efficient density matrix renormalization group (DMRG) algorithm is presented for the Bethe lattice with connectivity and antiferromagnetic exchange between nearest neigh…
Density matrix renormalization group (DMRG) for cyclic and centrosymmetric linear chains
Manoranjan Kumar, Dayasindhu Dey, Aslam Parvej +2
The density matrix renormalization group (DMRG) method generates the low-energy states of linear systems of sites with a few degrees of freedom at each site by starting with a…
Density matrix renormalization group approach to the low temperature thermodynamics of correlated 1D fermionic models
Sudip Kumar Saha, Debasmita Maiti, Manoranjan Kumar +1
The low temperature thermodynamics of correlated 1D fermionic models with spin and charge degrees of freedom is obtained by exact diagonalization (ED) of small systems and followed…
Numerical study of incommensurate and decoupled phases of spin-1/2 chains with isotropic exchange J1, J2 between first and second neighbors
Zoltán G. Soos, Aslam Parvej, Manoranjan Kumar
The spin-1/2 chain with isotropic exchange J1, J2 > 0 between first and second neighbors is frustrated for either sign of J1 and has a singlet ground state (GS) for J1/J2 …
Quantum phase transition in skewed ladders: an entanglement entropy and fidelity study
Sambunath Das, Dayasindhu Dey, S. Ramasesha +1
Entanglement entropy (EE) of a state is a measure of correlation or entanglement between two parts of a composite system and it may show appreciable change when the ground state (G…
Study of the Berezinskii-Kosterlitz-Thouless transition: An unsupervised machine learning approach
Sumit Haldar, Sk Saniur Rahaman, Manoranjan Kumar
The Berezinskii-Kosterlitz-Thouless (BKT) transition in magnetic system is an intriguing phenomena and an accurate estimation of the BKT transition temperature has been a long-stan…
Tunneling density of states in a Y junction of Tomonaga-Luttinger liquid wires: A density matrix renormalization group study
Monalisa Singh Roy, Manoranjan Kumar, Sourin Das
It is well known that the pristine bulk of an interacting one-dimensional system in Tomonaga-Luttinger liquid (TLL) phase shows power law suppression of quasi-particle tunneling am…
Quantum Phases of Long Range 1-D Bose-Hubbard Model: Field Theoretic and DMRG Study at Different Densities
Manoranjan Kumar, Sujit Sarkar, S. Ramasesha
We use Abelian Bosonization and density matrix renormalization group method to study the effect of density on quantum phases of long range 1-D Bose-Hubbard model. We predict the ex…
Emergent scalar-chirality \& colossal transverse-magnetoresponse in strongly correlated nodal-line half-metal
Jyotirmoy Sau, Sourav Chakraborty, Sourabh Saha +3
Understanding the interplay of strong correlation and temperature in nodal-line semimetals can offer novel ways to control spin currents. Here we consider the 3d-5d double-perovski…
Bond-order wave phase, spin solitons and thermodynamics of a frustrated linear spin-1/2 Heisenberg antiferromagnet
Manoranjan Kumar, S. Ramasesha, Z. G. Soos
The linear spin-1/2 Heisenberg antiferromagnet with exchanges , between first and second neighbors has a bond-order wave (BOW) phase that starts at the fluid-dimer trans…
Magnetic plateaus and jumps in a spin-1/2 ladder with alternate Ising-Heisenberg rungs: a field dependent study
Sk Saniur Rahaman, Manoranjan Kumar, Shaon Sahoo
We study a frustrated two-leg spin-1/2 ladder with alternate Ising and isotropic Heisenberg rung exchange interactions, whereas, interactions along legs and diagonals are Ising typ…
Quadrupolar Phases and Plateau States In Skewed Ladders
Sambunath Das, Dayasindhu Dey, Manoranjan Kumar +1
Two legged skewed spin- ladders are frustrated and exhibit exotic quantum phases in ground state due to strong quantum fluctuations and competing spin exchanges. Here,…
Order-disorder transition in active nematic: A lattice model study
Rakesh Das, Manoranjan Kumar, Shradha Mishra
We introduce a lattice model for active nematic composed of self-propelled apolar particles,study its different ordering states in the density-temperature parameter space, and comp…
Decoupled phase of frustrated spin-1/2 antiferromagnetic chains with and without long range order in the ground state
Manoranjan Kumar, Z. G. Soos
The quantum phases of one-dimensional spin chains are discussed for models with two parameters, frustrating exchange between second neighbors and normalized…
Magnetic Field Induced Exotic Phases in Isotropic Frustrated Spin-1/2 chain
Aslam Parvej, Manoranjan Kumar
The frustrated isotropic model with ferromagnetic and anti-ferromagnetic interactions in presence of an axial magnetic field shows many exotic phases, such as…
Magnetization plateaus of spin- system on a 5/7 skewed ladder
Dayasindhu Dey, Sambunath Das, Manoranjan Kumar +1
Magnetization plateaus are some of the most striking manifestations of frustration in low-dimensional spin systems. We present numerical studies of magnetization plateaus in the fa…
An Efficient Density Matrix Renormalization Group Algorithm for Chains with Periodic Boundary Condition
Dayasindhu Dey, Debasmita Maiti, Manoranjan Kumar
The Density Matrix Renormalization Group (DMRG) is a state-of-the-art numerical technique for a one dimensional quantum many-body system; but calculating accurate results for a sys…
Low temperature thermodynamics of the antiferromagnetic model: Entropy, critical points and spin gap
Sudip Kumar Saha, Manodip Routh, Manoranjan Kumar +1
The antiferromagnetic model is a spin-1/2 chain with isotropic exchange between first neighbors and between second neighbors. The model supports b…
Enhanced dynamics of active Brownian particles in periodic obstacle arrays and corrugated channels
Sudipta Pattanayak, Rakesh Das, Manoranjan Kumar +1
We study the motion of an active Brownian particle (ABP) using overdamped Langevin dynamics on a two-dimensional substrate with periodic array of obstacles and in a quasi-one-dimen…
Signatures of two ferromagnetic states and goniopolarity in LaCrGe3 in the Hall effect
Modhumita Sariket, Najrul Islam, Ayan Jana +3
LaCrGe3 has become a playground to understand quantum critical phenomena in ferromagnetic (FM) materials. It has also garnered attention due to its peculiar two FM phases. Here, we…
Electronic and magnetic ground states of {112} grain boundary in graphene in the extended Hubbard model
Sishir Jana, Dayasindhu Dey, Manoranjan Kumar +2
We study the ground state phase diagram of the extended Hubbard model in a half-filled 5/7 skewed ladder, which is topologically equivalent to a \{112\} grain boundary in graphene…
Spin-specific heat determination of the ratio of competing first- and second-neighbor exchange interactions in frustrated spin- chains
Dayasindhu Dey, Manoranjan Kumar, Siân E. Dutton +2
The magnetic susceptibility of spin-1/2 chains is widely used to quantify exchange interactions, even though is similar for different combinations of ferromagnetic…
Quantum phases of ferromagnetically coupled dimers on Shastry-Sutherland lattice
Monalisa Chatterjee, Santanu Pal, Manoranjan Kumar
The ground state (gs) of antiferromagnetically coupled dimers on the Shastry-Sutherland lattice (SSL) stabilizes many exotic phases and has been extensively studied. The gs propert…
Fulde-Ferrel-Larkin-Ovchinnikov phase in one dimensional Fermi gas with attractive interactions and transverse spin-orbit coupling
Monalisa Singh Roy, Manoranjan Kumar
We examine the existence and characteristics of the exotic Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) phase in a one-dimensional Fermi gas with attractive Hubbard interactions, in the…
Spin-Peierls transition of the dimer phase of the model: Energy cusp and CuGeO thermodynamics
Sudip Kumar Saha, Manoranjan Kumar, Zoltán G. Soos
The spin-Peierls transition is modeled in the dimer phase of the spin- chain with exchanges , between first and second neighbors. The degenerate ground stat…
A Study of Topological Quantum Phase Transition and Majorana Localization Length for the Interacting Helical Liquid System
Dayasindhu Dey, Sudip Kumar Saha, P. Singha Deo +2
We consider a helical spin liquid system which shows majorana fermion modes at the edge. The interaction between the quasiparticles in this system induces phase transition, Majoran…
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…
A Density Matrix Renormalization Group Method Study of Optical Properties of Porphines and Metalloporphines
Manoranjan Kumar, Y. Anusooya Pati, S. Ramasesha
The symmetrized Density-Matrix-Renormalization-Group (DMRG) method is used to study linear and nonlinear optical properties of Free base porphine and metallo-porphine. Long-range i…
Proximate Dirac spin liquid in honeycomb lattice - XXZ model: Numerical study and application to cobaltates
Anjishnu Bose, Manodip Routh, Sreekar Voleti +4
Recent theoretical and experimental work suggest that the honeycomb cobaltates, initially proposed as candidate Kitaev quantum magnets, are in fact described by a pseudospin-…
Density Induced Phases in Active Nematic
Rakesh Das, Manoranjan Kumar, Shradha Mishra
We introduce a minimal model for a collection of self-propelled apolar active particles, also called as `active nematic', on a two-dimensional substrate and study the order-disorde…
Quantum phase diagram of a frustrated spin-1/2 system on a Trellis Ladder
Debasmita Maiti, Manoranjan Kumar
We study an isotropic Heisenberg spin-1/2 model on a trellis ladder which is composed of two zigzag ladders interacting through anti-ferromagnetic rung couplings . T…
Quantum phases of a frustrated spin-1 system: The 5/7 skewed ladder
Sambunath Das, Dayasindhu Dey, Manoranjan Kumar +1
The quantum phases in a spin-1 skewed ladder system formed by alternately fusing five- and seven-membered rings are studied numerically using the exact diagonalization technique up…
Quantum phases of frustrated 2-leg spin-1/2 ladders with skewed rungs
Geetanjali Giri, Dayasindhu Dey, Manoranjan Kumar +2
The quantum phases of 2-leg spin-1/2 ladders with skewed rungs are obtained using exact diagonalization of systems with up to 26 spins and by density matrix renormalization group c…
Band splitting induced Berry flux and intrinsic anomalous Hall conductivity in NiCoMnGa quaternary Heusler compound
Gaurav K. Shukla, Jyotirmay Sau, Vishal Kumar +2
The anomalous transport properties of Heusler compounds become a hotspot of research in recent years due to their unique band structure and possible application in spintronics. In…
Level crossing, spin structure factor and quantum phases of the frustrated spin-1/2 chain with first and second neighbor exchange
Manoranjan Kumar, Aslam Parvej, Zoltán G. Soos
The spin-1/2 chain with isotropic Heisenberg exchange , between first and second neighbors is frustrated for either sign of J1. Its quantum phase diagram has critica…
Anderson transitions in disordered two-dimensional lattices
Dayasindhu Dey, Manoranjan Kumar, Pragya Shukla
We numerically analyze the energy level statistics of the Anderson model with Gaussian site disorder and constant hopping. The model is realized on different two-dimensional lattic…
Observation of a Novel Charge Density Wave Superstructure in Monolayer 1T- at Room Temperature and its Evolution in Multilayers
Samanta Pal, Kaustuv Chatterjee, Jyotirmoy Sau +4
Spontaneous formation of charge density wave (CDW) superstructures in monolayers (MLs) of a two-dimensional (2D) crystal lattice is fundamental in understanding its complex quantum…
Nanoscale Electronic Phase Separation Driven by Fe-site Ordering in Fe\textsubscript{5-x}GeTe\textsubscript{2}
Shreyashi Sinha, Ayan Jana, Suchanda Mondal +3
Understanding how local structural order governs electronic correlations is essential for revealing the microscopic mechanism underlying emergent behavior in two-dimensional magnet…
Ionization potentials of crystalline organic thin films: Position dependence due to molecular shape and charge redistribution
Benjamin J. Topham, Manoranjan Kumar, Zoltán G. Soos
In addition to electronic polarization or charge redistribution, the shape of neutral conjugated molecules yields position-dependent ionization potentials and electron affinities i…
Frustrated spin-1/2 Heisenberg model on a Kagome-strip chain: Dimerization and mapping to a spin-orbital Kugel-Khomskii model
Sayan Ghosh, Rajiv R. P. Singh, Manoranjan Kumar
We investigate the quantum phases of a frustrated antiferromagnetic Heisenberg spin-1/2 model Hamiltonian on a Kagome-strip chain (KSC), a one-dimensional analogue of the Kagome la…
Coexistence of surface and bulk state and negative magnetoresistance in Sulfur doped Bi2Se3
Rahul Singh, Vinod K. Gangwar, D. D. Daga +6
The magneto-transport properties in Sulfur doped Bi2Se3 are investigated. The magnetoresistance (MR) decreases with increase of S content and finally for 7% (i.e. y=0.21) S doping…
Polarization-Driven Charge Frustration and Emergent Phases in the One-Dimensional Extended Hubbard Model
Sourabh Saha, Jeroen van den Brink, Manoranjan Kumar +1
Frustration is a key driver of exotic quantum phases, yet its role in charge dynamics remains largely unexplored. We show that charge frustration - induced by electronic polarizati…
Polar flock in the presence of random quenched rotators
Rakesh Das, Manoranjan Kumar, Shradha Mishra
We study a collection of polar self-propelled particles (SPPs) on a two-dimensional substrate in the presence of random quenched rotators. These rotators act like obstacles which r…
Accessing quasi-flat -bands to harvest large Berry curvature in NdGaSi
Anyesh Saraswati, Jyotirmoy Sau, Vera Misheneva +10
In typical rare-earth lanthanide compounds, the localized 4\textit{f}-electrons have a weak effect on the electrical conduction, limiting their influence on the Berry curvature and…
Phase diagram of a coupled trimer system at half filling using the Hubbard model
Sourabh Saha, Hosho Katsura, Manoranjan Kumar
Flat band systems have recently attracted significant attention due to their instability under small perturbations, which can lead to the stabilization of many exotic quantum phase…
Interplay of Orbital Degeneracy and Vacancies in Stabilizing Collinear Magnetic Order in CrTe
Prasanta Chowdhury, Jyotirmoy Sau, Mohamad Numan +7
CrTe, a two-dimensional van der Waals ferromagnet, displays a contested magnetic structure, poised between collinear and non-collinear spin configurations. In this wor…
Spin structure factor and quantum phases of frustrated spin-1/2 chains
Manoranjan Kumar, Aslam Parvej, Z. G. Soos
The static structure factor S(q) of frustrated spin-1/2 chains with isotropic exchange and a singlet ground state (GS) diverges at wave vector q_m when the GS has quasi-long-range…
Fermion parity gap and exponential ground state degeneracy of the one-dimensional Fermi gas with intrinsic attractive interaction
Monalisa Singh Roy, Manoranjan Kumar, Jay D. Sau +1
We examine the properties of a one-dimensional (1D) Fermi gas with attractive intrinsic (Hubbard) interactions in the presence of spin-orbit coupling and Zeeman field by numericall…
Quantum Phase Transitions in Skewed Ladder Systems
Sambunath Das, Dayasindhu Dey, Rajamani Raghunathan +3
In this brief review, we introduce a new spin ladder system called skewed spin ladders and discuss the exotic quantum phases of this system. The spin ladders studied are the 5/7, 3…
Spin-1/2 string correlations and singlet-triplet gaps of frustrated ladders with ferromagnetic (F) legs and alternate F and AF rungs
Monalisa Chatterjee, Manoranjan Kumar, Zoltán G. Soos
The frustrated ladder with alternate ferromagnetic(F) exchange and AF exchange to first neighbors and F exchange to second neighbors is studied by exact diagona…
Predicting Fractionalized Multi-Spin Excitations in Resonant Inelastic X-ray Spectra of Frustrated Spin-1/2 Trimer Chains
Prabhakar, Subhajyoti Pal, Umesh Kumar +2
We theoretically investigate the resonant inelastic X-ray scattering (RIXS) spectra in a quasi-1D chain of weakly coupled frustrated spin-1/2 trimers, as realized in NaCu$_{3…
Anomalous Hall effect from gapped nodal line in Co2FeGe Heusler compound
Gaurav K. Shukla, Jyotirmay Sau, Nisha Shahi +3
Full Heusler compounds with Cobalt as a primary element show anomalous transport properties owing to the Weyl fermions and broken time-reversal symmetry. We present here the study…
Tuning the bond order wave (BOW) phase of half-filled extended Hubbard models
Manoranjan Kumar, S. Ramasesha, Z. G. Soos
Theoretical and computational studies of the quantum phase diagram of the one-dimensional half-filled extended Hubbard model (EHM) indicate a narrow bond order wave (BOW) phase wit…
Anomalous magnetotransport in a non-collinear correlated kagome ferromagnet MgMn6Sn6
Kakan Deb, Sourav Kanthal, Jyotirmoy Sau +5
Magnetic kagome metals provide a fertile platform for exploring unusual magnetotransport phenomena arising from the intricate interplay between electronic topology, electron correl…
Ground state properties and exact thermodynamics of a 2-leg anisotropic spin ladder system
Sk Saniur Rahaman, Shaon Sahoo, Manoranjan Kumar
We study a frustrated two-leg spin ladder with alternate isotropic Heisenberg and Ising rung exchange interactions, whereas, interactions along legs and diagonals are Ising-type. A…
Quantum phases of spin-1 system on 3/4 and 3/5 skewed ladders
Sambunath Das, Dayasindhu Dey, S. Ramasesha +1
We study the quantum phase transitions of frustrated antiferromagnetic Heisenberg spin-1 systems on the 3/4 and 3/5 skewed two leg ladder geometries. These systems can be viewed as…
B-site spin-state and anti-site disorder driven multiple-magnetic phases: Griffiths phase, re-entrant cluster glass and exchange bias in double perovskite PrCoFeO
Arkadeb Pal, P. Singh, Shiv Kumar +9
We report the comprehensive experimental results identifying the magnetic spin ordering and the magnetization dynamics of a double perovskite Pr2CoFeO6 by employing the (dc and ac)…
Basis Adaptive Algorithm for Quantum Many-Body Systems on Quantum Computers
Anutosh Biswas, Sayan Ghosh, Ritajit Majumdar +3
The paper proposes a Basis Adaptive algorithm that combines quantum sampling with classical diagonalization to compute ground‑state properties of correlated many‑body systems while…
Spin Peierls transition of and extended models with ferromagnetic .Sublattice dimerization and thermodynamics of zigzag chains in -TeVO
Manodip Routh, Sudip Kumar Saha, Manoranjan Kumar +1
The spin chain with ferromagnetic exchange between first neighbors and antiferromagnetic between second neighbors supports two spin-Peierls (SP) instabili…
Bond order wave (BOW) phase of the extended Hubbard model: Electronic solitons, paramagnetism, coupling to Peierls and Holstein phonons
Manoranjan Kumar, Zolt'an G. Soos
The bond order wave (BOW) phase of the extended Hubbard model (EHM) in one dimension (1D) is characterized at intermediate correlation by exact treatment of -site syste…
Rare observation of spin-gapless semiconducting characteristics and related band topology of quaternary Heusler alloy CoFeMnSn
Shuvankar Gupta, Jyotirmoy Sau, Manoranjan Kumar +1
In this paper, we report the theoretical investigation and experimental realization of a new spin-gapless semiconductor (SGSs) compound CoFeMnSn belonging to the family of quaterna…
Magnetic susceptibility of alkali-TCNQ salts and extended Hubbard models with bond order and charge density wave phases
Manoranjan Kumar, Benjamin J. Topham, Rui Hui Yu +2
The molar spin susceptibilities of Na-TCNQ, K-TCNQ and Rb-TCNQ(II) are fit quantitatively to 450 K in terms of half-filled bands of three one-dimensional Hubbard models wit…
Nonquenched rotators ease flocking and memorise it
Rakesh Das, Manoranjan Kumar, Shradha Mishra
We introduce a minimal model for a two-dimensional polar flock with nonquenched rotators, and show that the rotators make the usual macroscopic long-range order of the flock more r…
Suppression of Intrinsic Hall Effect through Competing Berry Curvature in CrTe
Prasanta Chowdhury, Jyotirmay Sau, Mohamad Numan +5
We conducted a comprehensive analysis of the magnetic and electronic transport properties of the layered chalcogenide CrTe in its single crystalline form. This materia…
Topological transitions to Weyl states in bulk BiSe: Effect of hydrostatic pressure and doping
Sudip Kumar Saha, Hrishit Banerjee, Manoranjan Kumar
BiSe, a layered three dimensional (3D) material, exhibits topological insulating properties due to presence of surface states and a band gap of 0.3 eV in the bulk. We study…
Efficient Density Matrix Renormalization Group algorithm to study Y-Junctions with integer and half-integer spin
Manoranjan Kumar, Aslam Parvej, Simil Thomas +2
An efficient density matrix renormalization group (DMRG) algorithm is presented and applied to Y-junctions, systems with three arms of sites that meet at a central site. The ac…
Emergent quasi-particles of spin-1 trimer chain
Manodip Routh, Anutosh Biswas, Manoranjan Kumar
The recent experimental realization of emergent quasi-particles, such as spinons, doublons, and quartons, in a spin- trimer chain has spurred new interest in low dimensional m…
Hybrid ED/DMRG approach to the thermodynamics of 1D quantum models
Sudip Kumar Saha, Dayasindhu Dey, Manoranjan Kumar +1
Exact diagonalization (ED) of small model systems gives the thermodynamics of spin chains or quantum cell models at high temperature . Density matrix renormalization group (DMRG…
Melting of Ferromagnetic Order on a Trellis Ladder
Debasmita Maiti, Manoranjan Kumar
The ground state properties of a frustrated spin-1/2 system is studied on a trellis ladder which is composed of two zigzag ladders interacting through rung interactions. The presen…
Anomalous transport in itinerant van der Waals ferromagnets FeGeTe (\emph{n}=3, 4, 5)
Jyotirmoy Sau, S. R. Hassan, Nitesh Kumar +1
Ferromagnetic (FM) semimetals FeGeTe(n=3, 4, 5), exhibit several symmetry-protected band-crossing points or lines near the Fermi energy (E) and these topological proper…
Frustrated spin-1/2 ladder with ferro- and antiferromagnetic legs
Debasmita Maiti, Dayasindhu Dey, Manoranjan Kumar
Two-leg spin-1/2 ladder systems consisting of a ferromagnetic leg and an antiferromagnetic leg are considered where the spins on the legs interact through antiferromagnetic rung co…
Characterization of Majorana-Ising phase transition in a helical liquid system
Sudip Kumar Saha, Dayasindhu Dey, Monalisa Singh Roy +2
We map an interacting helical liquid system, coupled to an external magnetic field and s-wave superconductor, to an XYZ spin system, and it undergoes Majorana-Ising transition by t…
Singlet quantum phases and magnetization of the frustrated spin-1/2 ladder with ferromagnetic (F) exchange in legs and alternating F-AF exchange in rungs
Monalisa Chatterjee, Manoranjan Kumar, Zoltán G. Soos
The magnetization is used to identify three singlet quantum phases of the ladder with isotropic exchange interactions. The Dimer phase with frustrated F exchanges in rungs a…
Tuning intrinsic anomalous Hall effect from large to zero in two ferromagnetic states of SmMn2Ge2
Mahima Singh, Jyotirmoy Sau, Banik Rai +3
The intrinsic anomalous Hall conductivity (AHC) in a ferromagnetic metal is completely determined by its band structure. Since the spin orientation direction is an important band-s…
Crystal structure and magnetic properties of spin- frustrated two-leg ladder compounds (CHN)Cu (= Cl and Br)
P. Biswal, S. Guchhait, S. Ghosh +5
We have successfully synthesized single crystals, solved the crystal structure, and studied the magnetic properties of a new family of copper halides (CHN)Cu…
Spin parity and broken symmetry in finite spin-1/2 chains with frustrated exchange: quantum transition from high to low spin
Manoranjan Kumar, Zoltán G. Soos
Exact diagonalization of finite spin-1/2 chains with periodic boundary conditions is applied to the ground state (gs) of chains with ferromagnetic (F) exchange between fir…