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Correlation functions at quantum criticality under broken time-reversal symmetry
- Authors
- Cha, Min-Chul; Ortiz, Gerardo
- Issue Date
- Feb-2008
- Publisher
- 한국물리학회
- Keywords
- quantum phase transition; critical phenomena; correlation function
- Citation
- Journal of the Korean Physical Society, v.52, pp.S158 - S161
- Indexed
- SCOPUS
KCI
- Journal Title
- Journal of the Korean Physical Society
- Volume
- 52
- Start Page
- S158
- End Page
- S161
- ISSN
- 0374-4884
- Abstract
- We investigate correlation functions in critical phenomena at zero temperature. We find that the equal-time correlation function of a quantum system at criticality does not have a diverging correlation length in the absence of time-reversal symmetry. We illustrate our main results analytically in the quantum spherical model as well as more explicitly by Monte Carlo calculations in the two-dimensional quantum rotor model.
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Related Researcher
- Cha, Min Chul
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY (DEPARTMENT OF PHOTONICS AND NANOELECTRONICS)