Details
| Original language | English |
|---|---|
| Article number | 29 |
| Journal | Atoms |
| Volume | 10 |
| Issue number | 1 |
| Publication status | Published - 2 Mar 2022 |
Abstract
We investigate the properties of a dilute gas of impurities embedded in an ultracold gas of bosons that forms a Bose–Einstein condensate (BEC). This work focuses mainly on the equation of state (EoS) of the impurity gas at zero temperature and the induced interaction between impurities mediated by the host bath. We use perturbative field-theory approaches, such as Hugenholtz– Pines formalism, in the weakly interacting regime. In turn, for strong interactions, we aim at non-perturbative techniques such as quantum–Monte Carlo (QMC) methods. Our findings agree with experimental observations for an ultra dilute gas of impurities, modeled in the framework of the single impurity problem; however, as the density of impurities increases, systematic deviations are displayed with respect to the one-body Bose polaron problem.
Keywords
- Gas of impurities, Induced interaction, Polaron–polaron interaction, Quantum–Monte Carlo
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Atoms, Vol. 10, No. 1, 29, 02.03.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ultra-Dilute Gas of Polarons in a Bose–Einstein Condensate
AU - Ardila, Luis A.Peña
N1 - Funding Information: Funding: This research was funded by the DFG Excellence Cluster QuantumFrontiers.
PY - 2022/3/2
Y1 - 2022/3/2
N2 - We investigate the properties of a dilute gas of impurities embedded in an ultracold gas of bosons that forms a Bose–Einstein condensate (BEC). This work focuses mainly on the equation of state (EoS) of the impurity gas at zero temperature and the induced interaction between impurities mediated by the host bath. We use perturbative field-theory approaches, such as Hugenholtz– Pines formalism, in the weakly interacting regime. In turn, for strong interactions, we aim at non-perturbative techniques such as quantum–Monte Carlo (QMC) methods. Our findings agree with experimental observations for an ultra dilute gas of impurities, modeled in the framework of the single impurity problem; however, as the density of impurities increases, systematic deviations are displayed with respect to the one-body Bose polaron problem.
AB - We investigate the properties of a dilute gas of impurities embedded in an ultracold gas of bosons that forms a Bose–Einstein condensate (BEC). This work focuses mainly on the equation of state (EoS) of the impurity gas at zero temperature and the induced interaction between impurities mediated by the host bath. We use perturbative field-theory approaches, such as Hugenholtz– Pines formalism, in the weakly interacting regime. In turn, for strong interactions, we aim at non-perturbative techniques such as quantum–Monte Carlo (QMC) methods. Our findings agree with experimental observations for an ultra dilute gas of impurities, modeled in the framework of the single impurity problem; however, as the density of impurities increases, systematic deviations are displayed with respect to the one-body Bose polaron problem.
KW - Gas of impurities
KW - Induced interaction
KW - Polaron–polaron interaction
KW - Quantum–Monte Carlo
UR - http://www.scopus.com/inward/record.url?scp=85125952277&partnerID=8YFLogxK
U2 - 10.3390/atoms10010029
DO - 10.3390/atoms10010029
M3 - Article
AN - SCOPUS:85125952277
VL - 10
JO - Atoms
JF - Atoms
IS - 1
M1 - 29
ER -