47 citations · 159 across the 18 of their papers we have counts for
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cond-mat2001★ 15 cited
Quantum phase transitions in the J-J' Heisenberg and XY spin-1/2 antiferromagnets on square lattice: Finite-size scaling analysis
Piotr Tomczak, Johannes Richter
We investigate the critical parameters of an order-disorder quantum phase transitions in the spin-1/2 Heisenberg and XY antiferromagnets on square lattice. Basing on the exc…
cond-mat.str-el2001★ 10 cited
The quantum Heisenberg antiferromagnet on the Sierpinski Gasket: An exact diagonalization study
Andreas Voigt, Johannes Richter, Piotr Tomczak
We present an exact diagonalization study of the quantum Heisenberg antiferromagnet on the fractal Sierpinski gasket for spin quantum numbers s=1/2,s=1 and s=3/2. Since the fractal…
cond-mat.stat-mech2001★ 6 cited
Ground state of the spin-1/2 Heisenberg antiferromagnet on an Archimedean 4-6-12 lattice
P. Tomczak, J. Schulenburg, J. Richter +1
An investigation of the Néel Long Range Order (NLRO) in the ground state of antiferromagnetic Heisenberg spin system on the two-dimensional, uniform, bipartite lattice consisting o…