Quantum phase transition of a two-dimensional quadrupolar system
| Autor: | Grigori E. Astrakharchik, Yu. E. Lozovik, I. L. Kurbakov, Demid V. Sychev, Aleksey Fedorov |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Quantum phase transition
Phase transition Montecarlo Mètode de FOS: Physical sciences 02 engineering and technology Bose-Einstein condensation 01 natural sciences law.invention Transition point law Diffusion quantum Monte Carlo Phase (matter) Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Transicions de fase (Física estadística) Condensació de Bose-Einstein 010306 general physics Phase transformations (Statistical physics) Phase diagram Physics Condensed Matter::Quantum Gases Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Física [Àrees temàtiques de la UPC] Bose-Einstein condensates 021001 nanoscience & nanotechnology Monte Carlo method Quantum Gases (cond-mat.quant-gas) Phase transitions Rydberg atom Diffusion Monte Carlo Condensed Matter - Quantum Gases 0210 nano-technology Bose–Einstein condensate |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system with quadrupolar interactions using a diffusion Monte Carlo technique. We predict a quantum phase transition from a gas to a solid phase. The Lindemann ratio and the condensate fraction at the transition point are $\gamma=0.269(4)$ and $n_0/n=0.031(4)$, correspondingly. We observe the strong rotonization of the collective excitation branch in the vicinity of the phase transition point. Our results can be probed using state-of-the-art experimental systems of various nature, such as quasi-two-dimensional systems of quadrupolar excitons in transition metal dichalcogenide (TMD) trilayers, quadrupolar molecules, and excitons or Rydberg atoms with quadrupole moments induced by strong magnetic fields. Comment: 7 pages, 5 figures |
| Databáze: | OpenAIRE |
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