230 citations · 2.1k across the 72 of their papers we have counts for
5 papers · 1 filter
Efficient and realistic device modeling from atomic detail to the nanoscale
J. E. Fonseca, T. Kubis, M. Povolotskyi +8
As semiconductor devices scale to new dimensions, the materials and designs become more dependent on atomic details. NEMO5 is a nanoelectronics modeling package designed for compre…
Neel to spin-Peierls transition in a quasi-1D Heisenberg model coupled to bond phonons
Jason Cornelius Pillay, Keola Wierschem, Pinaki Sengupta
The zero and finite temperature spin-Peierls transitions in a quasi-one-dimensional spin-1/2 Heisenberg model coupled to adiabatic bond phonons is investigated using the Stochastic…
Magnetization plateaus in generalized Shastry-Sutherland models
Keola Wierschem, Pinaki Sengupta
We study an anisotropic Heisenberg antiferromagnet with ferromagnetic transverse spin exchange using exact quantum Monte Carlo methods. Such a model is relevant to a class of rare…
Dimensional Crossover in Quasi-one-dimensional Spin-1 Heisenberg Antiferromagnets
Keola Wierschem, Pinaki Sengupta
We study the quenching of the Haldane gap in quasi-one-dimensional systems of weakly coupled spin-1 antiferromagnetic Heisenberg chains. The critical interchain coupling Jc require…
Phase Diagram and Magnetic Excitations of Anisotropic Spin-One Magnets
Zhifeng Zhang, Keola Wierschem, Ian Yap +3
We use a generalized spin wave approach and large scale quantum Monte Carlo (QMC) simulations to study the quantum phase diagram and quasiparticle excitations of the S=1 Heisenberg…