Quantum phase transition in the sub-ohmic spin-boson model: Quantum Monte Carlo study with a continuous imaginary time cluster algorithm
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
A continuous time cluster algorithm for two-level systems coupled to a dissipative bosonic bath is presented and applied to the sub-Ohmic spin-boson model. When the power s of the spectral function J(ω)α ωs is smaller than 1/2, the critical exponents are found to be classical, mean-field like. Potential sources for the discrepancy with recent renormalization group predictions are traced back to the effect of a dangerously irrelevant variable.
Details
Original language | English |
---|---|
Article number | 030601 |
Journal | Physical review letters |
Volume | 102 |
Issue number | 3 |
Publication status | Published - 20 Jan 2009 |
Peer-reviewed | Yes |
Externally published | Yes |