226 citations · 856 across the 20 of their papers we have counts for
20 papers
Invariants of winding-numbers and steric obstruction in dynamics of flux lines
O. Cépas, P. M. Akhmetiev
We classify the sectors of configurations that result from the dynamics of 2d crossing flux lines, which are the simplest degrees of freedom of the 3-coloring lattice model. We sho…
Colorings of odd or even chirality on hexagonal lattices
O. Cepas
We define two classes of colorings that have odd or even chirality on hexagonal lattices. This parity is an invariant in the dynamics of all loops, and explains why standard Monte-…
Electron spin resonance in S=1/2 antiferromagnets at high temperature
S. El Shawish, O. Cepas, S. Miyashita
We study the electron spin resonance (ESR) of low-dimensional spin systems at high temperature, and test the Kubo-Tomita theory of exchange narrowing. In finite-size systems (molec…
The incarnation of the Nersesyan-Tsvelik model in (NO)[Cu(NO3)3]
O. Volkova, I. Morozov, V. Shutov +8
The topology of the magnetic interactions of the copper spins in the nitrosonium nitratocuprate (NO)[Cu(NO3)3] suggests that it could be a realization of the Nersesyan-Tsvelik mode…
A Schwinger-boson approach to the kagome with Dzyaloshinskii-Moriya interactions: phase diagram and dynamical structure factors
L. Messio, O. Cepas, C. Lhuillier
We have obtained the zero-temperature phase diagram of the kagome antiferromagnet with Dzyaloshinskii-Moriya interactions in Schwinger-boson mean-field theory. We find quantum phas…
Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet
O. Cepas, C. M. Fong, P. W. Leung +1
We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For the system is in a moment-free…