| Full text | |
| Author(s): |
Total Authors: 4
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| Affiliation: | [1] Missouri Univ Sci & Technol, Dept Phys, Rolla, MO 65409 - USA
[2] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | Physical Review Letters; v. 125, n. 2 JUL 10 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
We study the collective excitations, i.e., the Goldstone (phase) mode and the Higgs (amplitude) mode, near the superfluid-Mott glass quantum phase transition in a two-dimensional system of disordered bosons. Using Monte Carlo simulations as well as an inhomogeneous quantum mean-field theory with Gaussian fluctuations, we show that the Higgs mode is strongly localized for all energies, leading to a noncritical scalar response. In contrast, the lowest-energy Goldstone mode undergoes a striking delocalization transition as the system enters the superfluid phase. We discuss the generality of these findings and experimental consequences, and we point out potential relations to many-body localization. (AU) | |
| FAPESP's process: | 16/10826-1 - Multi-user equipment approved in grant 2015/23849-7: computer cluster |
| Grantee: | Francisco Castilho Alcaraz |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 15/23849-7 - Quantum spin chains |
| Grantee: | Francisco Castilho Alcaraz |
| Support Opportunities: | Research Projects - Thematic Grants |