192 citations · 1.3k across the 69 of their papers we have counts for
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Quantum confinement effects on the ordering of the lowest-lying excited states in conjugated chains
Z. Shuai, J. L. Bredas, S. K. Pati +1
The symmetrized density matrix renormalization group approach is applied within the extended Hubbard-Peierls model (with parameters U/t, V/t, and bond alternation δ) to study the o…
Symmetrized DMRG studies of the properties of Low-lying states of Poly-para-phenylene (PPP) system
Y. Anusooya, Swapan K. Pati, S. Ramasesha
We report the symmetrized density matrix renormalization group (DMRG) study of neutral and doped oligomers of PPP system within an extended Hubbard model. Model parameters are dete…
Low-Lying Excited States and Low-Temperature Properties of an Alternating Spin-1 / Spin-1/2 Chain : A DMRG study
Swapan K. Pati, S. Ramasesha, Diptiman Sen
We report spin wave and DMRG studies of the ground and low-lying excited states of uniform and dimerized alternating spin chains. The DMRG procedure is also employed to obtain low-…
Estimation of properties of low-lying excited states of Hubbard models : a multi-configurational symmetrized projector quantum Monte Carlo approach
Bhargavi Srinivasan, S. Ramasesha, H. R. Krishnamurthy
We present in detail the recently developed multi-configurational symmetrized projector quantum Monte Carlo (MSPQMC) method for excited states of the Hubbard model. We describe the…
The Density Matrix Renormalization Group Studies of Metal-Halogen Chains within a Two-Band Extended Peierls-Hubbard Model
Y. Anusooya, Swapan K Pati, S. Ramasesha
The phase diagram of halogen-bridged mixed-valent metal complexes () has been studied using a two-band extended Peierls-Hubbard model employing the recently developed Density M…
Symmetrized PQMC Studies of the ground state of
Bhargavi Srinivasan, S. Ramasesha, H. R. Krishnamurthy
We develop a new version of the Projector Quantum Monte Carlo (SPQMC) method which preserves the symmetries of the system by simultaneously sampling all symmetr…
Variational Monte Carlo and Configurational Interaction Studies of and its Fragments
Bhargavi Srinivasan, S. Ramasesha, H. R. Krishnamurthy
The molecule and its fragments are studied using Configuration Interaction (CI) and Variational Monte Carlo (VMC) techniques, within the Hubbard model. Using benzene as a…
Symmetrized DMRG Method for Excited States of Hubbard Models
S. Ramasesha, Swapan K. Pati, H. R. Krishnamurthy +2
We extend the density matrix renormalization group method to exploit Parity, (rotation by ) and electron-hole symmtries of model Hamiltonians. We demonstrate the power of…
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…
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…