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Separation of two regimes in a disordered boson Hubbard model
- Authors
- Lee, Ji-Woo; CHA, Min-Chul
- Issue Date
- Aug-2004
- Publisher
- AMER PHYSICAL SOC
- Keywords
- Condensed Matter - Strongly Correlated Electrons; Condensed Matter - Disordered Systems and Neural Networks; Condensed Matter - Superconductivity
- Citation
- PHYSICAL REVIEW B, v.70, no.5, pp 1 - 4
- Pages
- 4
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 70
- Number
- 5
- Start Page
- 1
- End Page
- 4
- ISSN
- 2469-9950
2469-9969
- Abstract
- We study the insulator-to-superfluid transition in a two-dimensional disordered boson Hubbard model at zero temperature for intermediate strength of disorder at commensurate density. Via Monte Carlo calculations of the correlation functions in the integer current representation of the model, we obtain the dynamical critical exponent z=1.5+/-0.1, supporting the multicritical behavior separating the strong and weak disorder regimes. Investigating the density profile, we suggest that the density fluctuations due to the particle-hole excitations drive the transition in the weak disorder regime.
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