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Criticality in self-dual sine-Gordon models
P. Lecheminant, A. O. Gogolin, A. A. Nersesyan
We discuss the nature of criticality in the self-dual extention of the sine-Gordon model. This field theory is related to the two-dimensional classical XY model with a…
Comment on "Nonzero Fermi Level Density of States for a Disordered d-wave superconductor in 2D" by Ziegler et al. PRL 77, 3013 (1996)
A. A. Nersesyan, A. M. Tsvelik
In their paper Ziegler et al. claim that the model of 2D Dirac fermions in a random gauge potential has a finite density of states at zero energy. We point out that the approach us…
One-dimensional spin-liquid without magnon excitations
A. A. Nersesyan, A. M. Tsvelik
It is shown that a sufficiently strong four-spin interaction in the spin-1/2 spin ladder can cause dimerization. Such interaction can be generated either by phonons or (in the dope…
Antiferromagnetic spin ladders: crossover between spin S = 1/2 and S = 1 chains
D. G. Shelton, A. A. Nersesyan, A. M. Tsvelik
We study a model of two weakly coupled isotropic spin-1/2 Heisenberg chains with an antiferromagnetic coupling along the chains. It is shown that the system always has a spectral g…
Influence of Long-Range Coulomb Interactions on the Metal-Insulator Transition in One-Dimensional Strongly Correlated Electron Systems
I. V. Krive, A. A. Nersesyan, M. Jonson +1
The influence of long-range Coulomb interactions on the properties of one-dimensional (1D) strongly correlated electron systems in vicinity of the metal-insulator phase transition…
Gapless Phases in an s=1/2 Quantum Spin Chain with Bond Alternation
A. A. Nersesyan, A. Luther
The XXZ spin chain with the staggered XY anisotropy $$ H = J \sum_{n}^{N} (S^{x}_{n} S^{x}_{n+1} + S^{y}_{n} S^{y}_{n+1} + ΔS^{z}_{n} S^{z}_{n+1}) - δ\sum_{n}^{N} (-1)^{n}…
Disorder Effects in Two-Dimensional d-wave Superconductors
A. A. Nersesyan, A. M. Tsvelik, F. Wenger
Influence of weak nonmagnetic impurities on the single-particle density of states of two-dimensional electron systems with a conical spectrum is studied. We use a nonperturb…
Scaling Properties of the Two-Chain Model
A. A. Nersesyan, A. Luther, F. V. Kusmartsev
Scaling properties of a self-dual field-theoretical model, describing two weakl$spinless Luttinger chains, are studied. A crossover to a sine-Gordon massive phase, with strongly de…