Strong coupling Bose polarons in a two-dimensional gas
We study the properties of Bose polarons in two dimensions using quantum Monte Carlo techniques. Results for the binding energy, the effective mass, and the quasiparticle residue are reported for a typical strength of interactions in the gas and for a wide range of impurity-gas coupling strengths. A...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-06-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.023405 |
| _version_ | 1797211413141258240 |
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| author | L. A. Peña Ardila G. E. Astrakharchik S. Giorgini |
| author_facet | L. A. Peña Ardila G. E. Astrakharchik S. Giorgini |
| author_sort | L. A. Peña Ardila |
| collection | DOAJ |
| description | We study the properties of Bose polarons in two dimensions using quantum Monte Carlo techniques. Results for the binding energy, the effective mass, and the quasiparticle residue are reported for a typical strength of interactions in the gas and for a wide range of impurity-gas coupling strengths. A lower and an upper branch of the quasiparticle exist. The lower branch corresponds to an attractive polaron and spans from the regime of weak coupling where the impurity acts as a small density perturbation of the surrounding medium to deep bound states which involve many particles from the bath and extend as far as the healing length. The upper branch corresponds to an excited state where due to repulsion a low-density bubble forms around the impurity but might be unstable against decay into many-body bound states. Interaction effects strongly affect the quasiparticle properties of the polaron. In particular, in the strongly correlated regime, the impurity features a vanishing quasiparticle residue, signaling the transition from an almost free quasiparticle to a bound state involving many atoms from the bath. |
| first_indexed | 2024-04-24T10:26:05Z |
| format | Article |
| id | doaj.art-8d7f9dbafb9b49bc9d4c7aa3347195fb |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:26:05Z |
| publishDate | 2020-06-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-8d7f9dbafb9b49bc9d4c7aa3347195fb2024-04-12T16:56:12ZengAmerican Physical SocietyPhysical Review Research2643-15642020-06-012202340510.1103/PhysRevResearch.2.023405Strong coupling Bose polarons in a two-dimensional gasL. A. Peña ArdilaG. E. AstrakharchikS. GiorginiWe study the properties of Bose polarons in two dimensions using quantum Monte Carlo techniques. Results for the binding energy, the effective mass, and the quasiparticle residue are reported for a typical strength of interactions in the gas and for a wide range of impurity-gas coupling strengths. A lower and an upper branch of the quasiparticle exist. The lower branch corresponds to an attractive polaron and spans from the regime of weak coupling where the impurity acts as a small density perturbation of the surrounding medium to deep bound states which involve many particles from the bath and extend as far as the healing length. The upper branch corresponds to an excited state where due to repulsion a low-density bubble forms around the impurity but might be unstable against decay into many-body bound states. Interaction effects strongly affect the quasiparticle properties of the polaron. In particular, in the strongly correlated regime, the impurity features a vanishing quasiparticle residue, signaling the transition from an almost free quasiparticle to a bound state involving many atoms from the bath.http://doi.org/10.1103/PhysRevResearch.2.023405 |
| spellingShingle | L. A. Peña Ardila G. E. Astrakharchik S. Giorgini Strong coupling Bose polarons in a two-dimensional gas Physical Review Research |
| title | Strong coupling Bose polarons in a two-dimensional gas |
| title_full | Strong coupling Bose polarons in a two-dimensional gas |
| title_fullStr | Strong coupling Bose polarons in a two-dimensional gas |
| title_full_unstemmed | Strong coupling Bose polarons in a two-dimensional gas |
| title_short | Strong coupling Bose polarons in a two-dimensional gas |
| title_sort | strong coupling bose polarons in a two dimensional gas |
| url | http://doi.org/10.1103/PhysRevResearch.2.023405 |
| work_keys_str_mv | AT lapenaardila strongcouplingbosepolaronsinatwodimensionalgas AT geastrakharchik strongcouplingbosepolaronsinatwodimensionalgas AT sgiorgini strongcouplingbosepolaronsinatwodimensionalgas |