Variational theory of angulons and their rotational spectroscopy
- URL: http://arxiv.org/abs/2211.08070v1
- Date: Tue, 15 Nov 2022 11:46:05 GMT
- Title: Variational theory of angulons and their rotational spectroscopy
- Authors: Zhongda Zeng, Enderalp Yakaboylu, Mikhail Lemeshko, Tao Shi, Richard
Schmidt
- Abstract summary: A quasiparticle formed by a quantum rotor dressed by the excitations of a many-body bath can be used to describe an impurity rotating in a fluid or solid environment.
We reveal the quasiparticle properties, such as energies, quasiparticle weights and spectral functions, and show that our ansatz yields a persistent decrease in the impurity's rotational constant due to many-body dressing.
- Score: 0.6299766708197884
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The angulon, a quasiparticle formed by a quantum rotor dressed by the
excitations of a many-body bath, can be used to describe an impurity rotating
in a fluid or solid environment. Here we propose a coherent state ansatz in the
co-rotating frame which provides a comprehensive theoretical description of
angulons. We reveal the quasiparticle properties, such as energies,
quasiparticle weights and spectral functions, and show that our ansatz yields a
persistent decrease in the impurity's rotational constant due to many-body
dressing, consistent with experimental observations. From our study, a picture
of the angulon emerges as an effective spin interacting with a magnetic field
that is self-consistently generated by the molecule's rotation. Moreover, we
discuss rotational spectroscopy, which focuses on the response of rotating
molecules to a laser perturbation in the linear response regime. Importantly,
we take into account initial-state interactions that have been neglected in
prior studies and reveal their impact on the excitation spectrum. To examine
the angulon instability regime, we use a single-excitation ansatz and obtain
results consistent with experiments, in which a broadening of spectral lines is
observed while phonon wings remain highly suppressed due to initial-state
interactions.
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