81 citations · 215 across the 6 of their papers we have counts for
5 papers · 1 filter
Slow dynamics of the Fredkin spin chain
Khagendra Adhikari, K. S. D. Beach
The dynamical behavior of a quantum many-particle system is characterized by the lifetime of its excitations. When the system is perturbed, observables of any non-conserved quantit…
Frustrating antiferromagnetic exchange interactions enhance specific valence-bond-pair motifs
Xiaoming Zhang, Jin Xu, K. S. D. Beach
We present variational results for the ground state of the antiferromagnetic quantum Heisenberg model with frustrating next-nearest-neighbour interactions. The trial wave functions…
Some formal results for the valence bond basis
K. S. D. Beach, A. W. Sandvik
In a system with an even number of SU(2) spins, there is an overcomplete set of states--consisting of all possible pairings of the spins into valence bonds--that spans the S=0 Hilb…
Site dilution of quantum spins in the honeycomb lattice
Eduardo V. Castro, N. M. R. Peres, K. S. D. Beach +1
We discuss the effect of site dilution on both the magnetization and the density of states of quantum spins in the honeycomb lattice, described by the antiferromagnetic Heisenberg…
Field-induced Antiferromagnetism and the Kondo Insulator-to-Metal Transition
K. S. D. Beach, Patrick A. Lee, P. Monthoux
The Kondo lattice model, augmented by a Zeeman term, serves as a useful model of a Kondo insulator in an applied magnetic field. A variational mean field analysis of this system on…