Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules

I. Cherepanov, M. Lemeshko, Physical Review Materials 1 (2017).


Journal Article | Published | English
Department
Abstract
The formation of vortices is usually considered to be the main mechanism of angular momentum disposal in superfluids. Recently, it was predicted that a superfluid can acquire angular momentum via an alternative, microscopic route -- namely, through interaction with rotating impurities, forming so-called `angulon quasiparticles' [Phys. Rev. Lett. 114, 203001 (2015)]. The angulon instabilities correspond to transfer of a small number of angular momentum quanta from the impurity to the superfluid, as opposed to vortex instabilities, where angular momentum is quantized in units of ℏ per atom. Furthermore, since conventional impurities (such as molecules) represent three-dimensional (3D) rotors, the angular momentum transferred is intrinsically 3D as well, as opposed to a merely planar rotation which is inherent to vortices. Herein we show that the angulon theory can explain the anomalous broadening of the spectroscopic lines observed for CH 3 and NH 3 molecules in superfluid helium nanodroplets, thereby providing a fingerprint of the emerging angulon instabilities in experiment.
Publishing Year
Date Published
2017-08-08
Journal Title
Physical Review Materials
Volume
1
Issue
3
IST-REx-ID

Cite this

Cherepanov I, Lemeshko M. Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules. Physical Review Materials. 2017;1(3). doi:10.1103/PhysRevMaterials.1.035602
Cherepanov, I., & Lemeshko, M. (2017). Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules. Physical Review Materials, 1(3). https://doi.org/10.1103/PhysRevMaterials.1.035602
Cherepanov, Igor, and Mikhail Lemeshko. “Fingerprints of Angulon Instabilities in the Spectra of Matrix-Isolated Molecules.” Physical Review Materials 1, no. 3 (2017). https://doi.org/10.1103/PhysRevMaterials.1.035602.
I. Cherepanov and M. Lemeshko, “Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules,” Physical Review Materials, vol. 1, no. 3, 2017.
Cherepanov I, Lemeshko M. 2017. Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules. Physical Review Materials. 1(3).
Cherepanov, Igor, and Mikhail Lemeshko. “Fingerprints of Angulon Instabilities in the Spectra of Matrix-Isolated Molecules.” Physical Review Materials, vol. 1, no. 3, American Physical Society, 2017, doi:10.1103/PhysRevMaterials.1.035602.

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