14 citations · 19 across the 3 of their papers we have counts for
5 papers
Entanglement Perturbation Theory for Antiferromagnetic Heisenberg Spin Chains
Lihua Wang, Sung Gong Chung
A recently developed numerical method, entanglement perturbation theory (EPT), is used to study the antiferromagnetic Heisenberg spin chains with z-axis anisotropy and magnetic…
Entanglement Perturbation Theory for Infinite Quasi-1D Quantum Systems
Lihua Wang, Sung Gong Chung
We develop Entanglement Perturbation Theory (EPT) for infinite Quasi-1D quantum systems. The spin 1/2 Heisenberg chain with ferromagnetic nearest neighbor (NN) and antiferromagneti…
Entanglement perturbation theory for the elementary excitation in one dimension
Sung Gong Chung, Lihua Wang
The entanglement perturbation theory is developed to calculate the excitation spectrum in one dimension. Applied to the spin- antiferromagnetic Heisenberg model, it re…
Spontaneous symmetry breaking in the finite, lattice quantum sine-Gordon model
S. G. Chung
The spontaneous breaking of a global discrete translational symmetry in the finite, lattice quantum sine-Gordon model is demonstrated by a density matrix renormalization group. A p…
Essential finite-size effect in the 2D XY model
S. G. Chung
The thermodynamics of the 2D XY model is formulated by a transfer matrix method and analyzed by a density matrix renormalization group. The finite-size scaling and the beta functio…