期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.203001
关键词
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资金
- NSF through a grant for the Institute for Theoretical Atomic, Molecular, and Optical Physics at Harvard University
- Smithsonian Astrophysical Observatory
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205923, 1521560, 1205635] Funding Source: National Science Foundation
We develop a microscopic theory describing a quantum impurity whose rotational degree of freedom is coupled to a many-particle bath. We approach the problem by introducing the concept of an angulon-a quantum rotor dressed by a quantum field-and reveal its quasiparticle properties using a combination of variational and diagrammatic techniques. Our theory predicts renormalization of the impurity rotational structure, such as that observed in experiments with molecules in superfluid helium droplets, in terms of a rotational Lamb shift induced by the many-particle environment. Furthermore, we discover a rich many-body-induced fine structure, emerging in rotational spectra due to a redistribution of angular momentum within the quantum many-body system.
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