Linear rotor in an ideal Bose gas near the threshold for binding
arXiv:2308.03852 · doi:10.1103/PhysRevB.109.014102
Abstract
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.
version accepted for publication in Phys. Rev. B
References in corpus (14)
- Ultra-cold Polarized Fermi Gases
- Variational study of polarons in Bose-Einstein condensates
- Exact diagonalization: the Bose-Hubbard model as an example
- Rotation of quantum impurities in the presence of a many-body environment
- Numerical analytic continuation: Answers to well-posed questions
- Quasiparticle approach to molecules interacting with quantum solvents
- Universal aspects of a strongly interacting impurity in a dilute Bose condensate
- Model independence in two dimensions and polarized cold dipolar molecules
- Self-localized state and solitons in a Bose-Einstein-condensate-impurity mixture at finite temperature
- Quench Dynamics of the Ideal Bose Polaron at Zero and Nonzero Temperatures
- Femtosecond rotational dynamics of D molecules in superfluid helium nanodroplets
- Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules
- Holstein polaron: the effect of multiple phonon modes
- Angular self-localization of impurities rotating in a bosonic bath