# Rotation of Quantum Impurities in the Presence of a Many-Body Environment.

@article{Schmidt2015RotationOQ, title={Rotation of Quantum Impurities in the Presence of a Many-Body Environment.}, author={Richard Schmidt and Mikhail Lemeshko}, journal={Physical review letters}, year={2015}, volume={114 20}, pages={ 203001 } }

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…

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