Two-dimensional repulsive Fermi polarons with short- A nd long-range interactions
| Autor: | G. Bertaina, Raúl Bombín, Jordi Boronat, Ferran Mazzanti, Stefano Giorgini, Tommaso Comparin |
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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 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Condensed matter physics Montecarlo Mètode de Ionic crystalls FOS: Physical sciences Observable Scattering length Polaron 01 natural sciences 010305 fluids & plasmas Monte Carlo method Dipole Effective mass (solid-state physics) Distribution function Quantum Gases (cond-mat.quant-gas) 0103 physical sciences Quasiparticle Diffusion Monte Carlo Condensed Matter::Strongly Correlated Electrons Condensed Matter - Quantum Gases 010306 general physics Cristalls iònics |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | We study the repulsive polaron problem in a two-component two-dimensional system of fermionic atoms. We use two different interaction models: a short-range (hard-disk) potential and a dipolar potential. In our approach, all the atoms have the same mass and we consider the system to be composed of a uniform bath of a single species and a single atomic impurity. We use the diffusion Monte Carlo method to evaluate polaron properties such as its chemical potential and pair distribution functions, together with a discussion on the deficit of volume induced by the impurity.We also evaluate observables that allow us to determine the validity of the quasiparticle picture: the quasiparticle residue and the effective mass of the polaron. Employing two different potentials allows us to identify the universality regime, where the properties depend only on the gas parameter na2s fixed by the bath density and the two-dimensional scattering length. |
| Databáze: | OpenAIRE |
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