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Quantum critical phenomena with broken particle-hole symmetry
- Authors
- Cha, Min-Chul; Ortiz, Gerardo
- Issue Date
- Apr-2008
- Publisher
- AMER PHYSICAL SOC
- Keywords
- INSULATOR TRANSITION; SUPERFLUID
- Citation
- PHYSICAL REVIEW B, v.77, no.16, pp 1 - 5
- Pages
- 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 77
- Number
- 16
- Start Page
- 1
- End Page
- 5
- ISSN
- 2469-9950
2469-9969
- Abstract
- We investigate the functional form of the order-parameter (two-point) correlation function in quantum critical phenomena. When broken particle-hole symmetry brings the dynamical critical exponent z=2, we find that the equal-time correlation function at criticality does not display a diverging correlation length. We illustrate our conclusions by Monte Carlo calculations of the quantum rotor model in d=2 space dimensions.
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