Finite temperature variational analysis of the tunneling and localization in spin-phonon model
Апстракт
Temperature dependence of the effective tunneling frequency of the spin-phonon model for a few particular types of coupling has been studied within the framework of the simple variational method. Our analysis shows that for the Ohmic type of coupling, temperature drives the system towards delocalization. The same type of behavior has been noticed for super-Ohmic case, but in the so-called adiabatic regime, while in the nonadiabatic case we predict localization transition, analogous to that observed for Ohmic coupling, when temperature dependent coupling constant S(T) approaches critical value S(T) similar to 1/2. In contrast to these results, for super-Ohmic (r = 3) case, there was no substantial difference with respect to zero-temperature case. Brief discussion of the validity of the method has been given. (c) 2005 Published by Elsevier B.V.
Кључне речи:
quantum dissipative systems / spin-boson model / ohmic dissipationИзвор:
Physics Letters A, 2005, 339, 3-5, 393-402
DOI: 10.1016/j.physleta.2006.02.067
ISSN: 0375-9601; 1873-2429
WoS: 000228935800030
Scopus: 2-s2.0-33748741181
Колекције
Институција/група
VinčaTY - JOUR AU - Ivić, Zoran AU - Kostić, Dragan AU - Kapor, Darko PY - 2005 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2885 AB - Temperature dependence of the effective tunneling frequency of the spin-phonon model for a few particular types of coupling has been studied within the framework of the simple variational method. Our analysis shows that for the Ohmic type of coupling, temperature drives the system towards delocalization. The same type of behavior has been noticed for super-Ohmic case, but in the so-called adiabatic regime, while in the nonadiabatic case we predict localization transition, analogous to that observed for Ohmic coupling, when temperature dependent coupling constant S(T) approaches critical value S(T) similar to 1/2. In contrast to these results, for super-Ohmic (r = 3) case, there was no substantial difference with respect to zero-temperature case. Brief discussion of the validity of the method has been given. (c) 2005 Published by Elsevier B.V. T2 - Physics Letters A T1 - Finite temperature variational analysis of the tunneling and localization in spin-phonon model VL - 339 IS - 3-5 SP - 393 EP - 402 DO - 10.1016/j.physleta.2006.02.067 ER -
@article{ author = "Ivić, Zoran and Kostić, Dragan and Kapor, Darko", year = "2005", abstract = "Temperature dependence of the effective tunneling frequency of the spin-phonon model for a few particular types of coupling has been studied within the framework of the simple variational method. Our analysis shows that for the Ohmic type of coupling, temperature drives the system towards delocalization. The same type of behavior has been noticed for super-Ohmic case, but in the so-called adiabatic regime, while in the nonadiabatic case we predict localization transition, analogous to that observed for Ohmic coupling, when temperature dependent coupling constant S(T) approaches critical value S(T) similar to 1/2. In contrast to these results, for super-Ohmic (r = 3) case, there was no substantial difference with respect to zero-temperature case. Brief discussion of the validity of the method has been given. (c) 2005 Published by Elsevier B.V.", journal = "Physics Letters A", title = "Finite temperature variational analysis of the tunneling and localization in spin-phonon model", volume = "339", number = "3-5", pages = "393-402", doi = "10.1016/j.physleta.2006.02.067" }
Ivić, Z., Kostić, D.,& Kapor, D.. (2005). Finite temperature variational analysis of the tunneling and localization in spin-phonon model. in Physics Letters A, 339(3-5), 393-402. https://doi.org/10.1016/j.physleta.2006.02.067
Ivić Z, Kostić D, Kapor D. Finite temperature variational analysis of the tunneling and localization in spin-phonon model. in Physics Letters A. 2005;339(3-5):393-402. doi:10.1016/j.physleta.2006.02.067 .
Ivić, Zoran, Kostić, Dragan, Kapor, Darko, "Finite temperature variational analysis of the tunneling and localization in spin-phonon model" in Physics Letters A, 339, no. 3-5 (2005):393-402, https://doi.org/10.1016/j.physleta.2006.02.067 . .