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Phase Transitions in the Two-Dimensional Quantum Rotor Model at Finite Temperature

Title
Phase Transitions in the Two-Dimensional Quantum Rotor Model at Finite Temperature
Author
차민철
Keywords
quantum phase transition; critical phenomena; SUPERFLUID-INSULATOR TRANSITION; KOSTERLITZ-THOULESS TRANSITION; 2 DIMENSIONS; XY-MODEL; CRITICALITY; SYSTEMS
Issue Date
2008-08
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v. 53, No. 2, Page. 1265-1268
Abstract
We study phase transitions in the two-dimensional quantum rotor model with zero-point quantum fluctuations at finite temperature through Monte Carlo simulations. The high-quality finite-size scaling behavior of the superfluid stiffness clearly confirms the nature of the Kosterlitz-Thouless transition and the universal jump at the critical point. The compressibility shows a thermally activated behavior, from which the energy gap is obtained in the insulating region. Some anomalous properties of the specific heat in the normal state are discussed as possible remanent effects of quantum fluctuations at low temperature.
URI
http://www.jkps.or.kr/journal/view.html?volume=53&number=9(2)&spage=1265&year=2008http://repository.hanyang.ac.kr/handle/20.500.11754/80626
ISSN
0374-4884
DOI
10.3938/jkps.53.1265
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
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