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Bose glass and Mott glass of quasiparticles in a doped quantum magnet
- Source :
- Nature. 489:379-384
- Publication Year :
- 2012
- Publisher :
- Springer Science and Business Media LLC, 2012.
-
Abstract
- The low-temperature states of bosonic fluids exhibit fundamental quantum effects at the macroscopic scale: the best-known examples are Bose-Einstein condensation (BEC) and superfluidity, which have been tested experimentally in a variety of different systems. When bosons are interacting, disorder can destroy condensation leading to a so-called Bose glass. This phase has been very elusive to experiments due to the absence of any broken symmetry and of a finite energy gap in the spectrum. Here we report the observation of a Bose glass of field-induced magnetic quasiparticles in a doped quantum magnet (Br-doped dichloro-tetrakis-thiourea-Nickel, DTN). The physics of DTN in a magnetic field is equivalent to that of a lattice gas of bosons in the grand-canonical ensemble; Br-doping introduces disorder in the hoppings and interaction strengths, leading to localization of the bosons into a Bose glass down to zero field, where it acquires the nature of an incompressible Mott glass. The transition from the Bose glass (corresponding to a gapless spin liquid) to the BEC (corresponding to a magnetically ordered phase) is marked by a novel, universal exponent governing the scaling on the critical temperature with the applied field, in excellent agreement with theoretical predictions. Our study represents the first, quantitative account of the universal features of disordered bosons in the grand-canonical ensemble.<br />Comment: 13+6 pages, 5+6 figures; v2: Fig. 5 updated
- Subjects :
- Bose gas
FOS: Physical sciences
01 natural sciences
010305 fluids & plasmas
Superfluidity
Condensed Matter - Strongly Correlated Electrons
symbols.namesake
Bose–Einstein statistics
Quantum mechanics
0103 physical sciences
Symmetry breaking
010306 general physics
Boson
Condensed Matter::Quantum Gases
Physics
Multidisciplinary
Strongly Correlated Electrons (cond-mat.str-el)
Condensed matter physics
Condensed Matter::Other
Disordered Systems and Neural Networks (cond-mat.dis-nn)
Condensed Matter - Disordered Systems and Neural Networks
3. Good health
Grand canonical ensemble
Quasiparticle
symbols
Quantum spin liquid
Subjects
Details
- ISSN :
- 14764687 and 00280836
- Volume :
- 489
- Database :
- OpenAIRE
- Journal :
- Nature
- Accession number :
- edsair.doi.dedup.....b9dac17011256b8b0d957c5974c1b725