Linear rotor in an ideal Bose gas near the threshold for binding
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866914632905523200 |
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| author | Dome, Tibor Volosniev, Artem G. Ghazaryan, Areg Safari, Laleh Schmidt, Richard Lemeshko, Mikhail |
| author_facet | Dome, Tibor Volosniev, Artem G. Ghazaryan, Areg Safari, Laleh Schmidt, Richard Lemeshko, Mikhail |
| contents | We study a linear rotor in a bosonic bath within the angulon formalism. Our focus is on systems where isotropic or anisotropic impurity-boson interactions support a shallow bound state. To study the fate of the angulon in the vicinity of bound-state formation, we formulate a beyond-linear-coupling angulon Hamiltonian. First, we use it to study attractive, spherically symmetric impurity-boson interactions for which the linear rotor can be mapped onto a static impurity. The well-known polaron formalism provides an adequate description in this limit. Second, we consider anisotropic potentials, and show that the presence of a shallow bound state with pronounced anisotropic character leads to a many-body instability that washes out the angulon dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_03852 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Linear rotor in an ideal Bose gas near the threshold for binding Dome, Tibor Volosniev, Artem G. Ghazaryan, Areg Safari, Laleh Schmidt, Richard Lemeshko, Mikhail Quantum Gases Chemical Physics Quantum Physics We study a linear rotor in a bosonic bath within the angulon formalism. Our focus is on systems where isotropic or anisotropic impurity-boson interactions support a shallow bound state. To study the fate of the angulon in the vicinity of bound-state formation, we formulate a beyond-linear-coupling angulon Hamiltonian. First, we use it to study attractive, spherically symmetric impurity-boson interactions for which the linear rotor can be mapped onto a static impurity. The well-known polaron formalism provides an adequate description in this limit. Second, we consider anisotropic potentials, and show that the presence of a shallow bound state with pronounced anisotropic character leads to a many-body instability that washes out the angulon dynamics. |
| title | Linear rotor in an ideal Bose gas near the threshold for binding |
| topic | Quantum Gases Chemical Physics Quantum Physics |
| url | https://arxiv.org/abs/2308.03852 |