10 papers
Role of Electron--Electron Interactions on Spin Effects in Electron--Hole Recombination in Organic Light Emitting Diodes
Mousumi Das, S. Mazumdar, S. Ramasesha
We extend our theory of electron--hole recombination in organic light emitting diodes to investigate the possibility that high energy singlet and triplet excited states with large…
Characterization of the Energy Structure and Adiabatic Magnetization Process of V15
Indranil Rudra, K. Saito, S. Ramasesha +1
The energy structure of the V is studied using exact diagonalization methods, and the adiabatic changes of the magnetization in the system with the sweeping field are invest…
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…
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…
Dynamic Oscillations of Magnetization in High Spin Magnetic Clusters
Indranil Rudra, S. Ramasesha
We have studied the time evolution of magnetization of a high spin magnetic cluster in the ground state, in the presence of a sinusoidal axial magnetic field and a static transvers…
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…