3 papers
quant-ph2005
Once more on the equivalence between quantum phase transition phenomena in radiation-matter and magnetic systems
J. G. Brankov, N. S. Tonchev, V. A. Zagrebnov
In answer to the replies of Reslen {\it et al} [arXiv: quant-ph/0507164 (2005)], and Liberti and Zaffino [arXiv:cond-mat/0507019, (2005)], we comment once more on the temperature-d…
quant-ph2005
Comment on equivalence between quantum phase transition phenomena in radiation-matter and magnetic systems
J. G. Brankov, N. S. Tonchev, V. A. Zagrebnov
In this Comment we show that the temperature-dependent effective Hamiltonian derived by Reslen {\it et al} [Europhys. Lett., {\bf 69} (2005) 8] or that one by Liberti and Zaffino […
math-ph2004
Gibbs State Uniqueness for Anharmonic Quantum Crystal with a Nonpolynomial Double-Well Potential
Alexei L. Rebenko, Valentin A. Zagrebnov
We construct the Gibbs state for -dimensional quantum crystal with site displacements from , , and with a one-site \textit{non-polynomial} double-well potential,…