26 citations · 100 across the 18 of their papers we have counts for
18 papers
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…
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…
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,…
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…
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…
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…
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…
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…
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…
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 $J…
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…
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…
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…
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…
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…
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…
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…
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…