Details
| Original language | English |
|---|---|
| Article number | 033323 |
| Journal | Physical Review A |
| Volume | 103 |
| Issue number | 3 |
| Publication status | Published - 23 Mar 2021 |
Abstract
We investigate the nonequilibrium dynamics of an impurity coupled to a Bose-Einstein condensate, systematically compared with recent experimental results [M. G. Skou, Nat. Phys. (2021)10.1038/s41567-021-01184-5]. The dynamics of the impurity is tracked down by using a time-dependent variational coherent ansatz. For weak coupling between the impurity and the bath, analytical expressions for the time-dependent contrast are derived, matching quite well with previous findings obtained within a master equation approach. For strong coupling instead, the variational ansatz provides a good quantitative description of the polaron dynamics, in particular, in signaling the transition from the few- to the many-body correlated regime where polarons are expected to form.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Physical Review A, Vol. 103, No. 3, 033323, 23.03.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Dynamical formation of polarons in a Bose-Einstein condensate: A variational approach
AU - Ardila, L. A.Pena
N1 - Funding Information: We gratefully acknowledge Kristian K. Nielsen for discussions at an earlier stage of this work. We also thank Magnus G. Skou, Nils Byg Jørgensen, and Jan Artl for insightful discussions and for providing the experimental data. The authors also acknowledge Luis Santos, Fabian Grusdt, Artem Volosniev, and Giacomo Bighin for reading the manuscript and for the critical feedback. Special acknowledgment is given to Roberta Giusteri for critical comments on the manuscript. This research was funded by the DFG Excellence Cluster QuantumFrontiers.
PY - 2021/3/23
Y1 - 2021/3/23
N2 - We investigate the nonequilibrium dynamics of an impurity coupled to a Bose-Einstein condensate, systematically compared with recent experimental results [M. G. Skou, Nat. Phys. (2021)10.1038/s41567-021-01184-5]. The dynamics of the impurity is tracked down by using a time-dependent variational coherent ansatz. For weak coupling between the impurity and the bath, analytical expressions for the time-dependent contrast are derived, matching quite well with previous findings obtained within a master equation approach. For strong coupling instead, the variational ansatz provides a good quantitative description of the polaron dynamics, in particular, in signaling the transition from the few- to the many-body correlated regime where polarons are expected to form.
AB - We investigate the nonequilibrium dynamics of an impurity coupled to a Bose-Einstein condensate, systematically compared with recent experimental results [M. G. Skou, Nat. Phys. (2021)10.1038/s41567-021-01184-5]. The dynamics of the impurity is tracked down by using a time-dependent variational coherent ansatz. For weak coupling between the impurity and the bath, analytical expressions for the time-dependent contrast are derived, matching quite well with previous findings obtained within a master equation approach. For strong coupling instead, the variational ansatz provides a good quantitative description of the polaron dynamics, in particular, in signaling the transition from the few- to the many-body correlated regime where polarons are expected to form.
UR - http://www.scopus.com/inward/record.url?scp=85103660221&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.103.033323
DO - 10.1103/PhysRevA.103.033323
M3 - Article
AN - SCOPUS:85103660221
VL - 103
JO - Physical Review A
JF - Physical Review A
SN - 2469-9926
IS - 3
M1 - 033323
ER -