Disorder-Induced Superfluidity in Hardcore Bosons in Two Dimensions
| dc.creator | Lee, Ji-Woo | |
| dc.creator | Chandrasekharan, Shailesh | |
| dc.creator | Baranger, Harold U. | |
| dc.date | 2006-11-04 | |
| dc.date.accessioned | 2026-07-07T07:31:13Z | |
| dc.date.available | 2026-07-07T07:31:13Z | |
| dc.description | We study the effect of disorder on hardcore bosons in two dimensions at the SU(2) symmetric ``Heisenberg point''. We obtain our results with quantum Monte Carlo simulations using the directed loop algorithm. In the absence of disorder, the system has no long-range order at finite temperature due to the enhanced symmetry. However, the introduction of a disordered potential, uniformly distributed from -D to D, induces a finite-temperature superfluid phase. In particular the diagonal correlation length ξdecreases but the superfluid order-parameter correlation function becomes a power-law. A non-monotonic finite-size behavior is noted and explained as arising due to ξ. We provide evidence that at long distances the effects of a weak disordered potential can be mimicked by an effective uniform potential with a root-mean-square value: mu_eff = D/sqrt{3}. For strong disorder, the system becomes a Bose glass insulator. | |
| dc.description | 6 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0611109 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0611109 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/118672 | |
| dc.subject | Statistical Mechanics | |
| dc.subject | Superconductivity | |
| dc.title | Disorder-Induced Superfluidity in Hardcore Bosons in Two Dimensions | |
| dc.type | text |