S. Saha

The spin-Peierls transition at $T_{S P}$ of spin- $1/2$ chains with isotropic exchange interactions has previously been modeled as correlated for $T > T_{S P}$ and mean field for $T <…

cond-mat.str-el2019

Spin-Peierls transition of the dimer phase of the $J_{1} - J_{2}$ model: Energy cusp and CuGeO $_{3}$ thermodynamics

Sudip Kumar Saha, Manoranjan Kumar, Zoltán G. Soos

The spin-Peierls transition is modeled in the dimer phase of the spin- $1/2$ chain with exchanges $J_{1}$ , $J_{2} = α J_{1}$ between first and second neighbors. The degenerate ground state…

cond-mat.str-el2019

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 $T$ . Density matrix renormalization group (DMRG…

cond-mat.str-el2019

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- $s$ chain with alternating ferromagnetic ( $- J_{1}^{F} < 0$ ) and antiferromagnetic ( $J_{1}^{A} > 0$ ) nearest-neighbor (NN) interactions, exhibits the Dimer and spin- $2 s$ Halda…

cond-mat.str-el2017

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…

cond-mat.str-el2017★ 3 cited

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…

Modeling the spin-Peierls transition of spin-1/2 chains with correlated states: J1​−J2​ model, CuGeO3​ and TTF-CuS4​C4​(CF3​)4​

Spin-Peierls transition of the dimer phase of the J1​−J2​ model: Energy cusp and CuGeO3​ thermodynamics

Hybrid ED/DMRG approach to the thermodynamics of 1D quantum models

Haldane and Dimer phases in a frustrated spin chain: an exact groundstate and associated topological phase transition

Characterization of Majorana-Ising phase transition in a helical liquid system

A Study of Topological Quantum Phase Transition and Majorana Localization Length for the Interacting Helical Liquid System

Modeling the spin-Peierls transition of spin- $1/2$ chains with correlated states: $J_{1} - J_{2}$ model, CuGeO $_{3}$ and TTF-CuS $_{4}$ C $_{4}$ (CF $_{3}$ ) $_{4}$

Spin-Peierls transition of the dimer phase of the $J_{1} - J_{2}$ model: Energy cusp and CuGeO $_{3}$ thermodynamics