Rotons and Bose condensation in Rydberg-dressed Bose Gases
| Autor: | Reza Asgari, Iran Seydi, Robert E. Zillich, Saeed H. Abedinpour, Bilal Tanatar |
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| Přispěvatelé: | Tanatar, Bilal |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Quantum phase transition Monte Carlo method FOS: Physical sciences Bose gases Bose-Einstein condensates Radius Hartree 01 natural sciences 010305 fluids & plasmas Superfluidity symbols.namesake Quantum Gases (cond-mat.quant-gas) Cold and ultracold molecules 0103 physical sciences Rydberg formula symbols Atomic physics 010306 general physics Condensed Matter - Quantum Gases Ultracold gases Path integral Monte Carlo Rydberg atoms & molecules Boson |
| Zdroj: | Physical Review A |
| Popis: | We investigate the ground-state properties and excitations of Rydberg-dressed bosons in both three and two dimensions, using the hypernetted-chain Euler-Lagrange approximation, which accounts for correlations and thus goes beyond the mean field approximation. The short-range behavior of the pair distribution function signals the instability of the homogeneous system towards the formation of droplet crystals at strong couplings and large soft-core radius. This tendency to spatial density modulation coexists with off-diagonal long-range order. The contribution of the correlation energy to the ground-state energy is significant at large coupling strengths and intermediate values of the soft-core radius while for a larger soft-core radius the ground-state energy is dominated by the mean-field (Hartree) energy. We have also performed path integral Monte Carlo simulations to verify the performance of our hypernetted-chain Euler-Lagrange results in three dimensions. In the homogeneous phase, the two approaches are in very good agreement. Moreover, Monte Carlo simulations predict a first-order quantum phase transition from a homogeneous superfluid phase to the quantum droplet phase with face-centered cubic symmetry for Rydberg-dressed bosons in three dimensions. 12 pages, 15 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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