## Misha Lemeshko featured in Kronen Zeitung

(yes, we know)

Theorists working at the interface of condensed matter, chemical, and atomic physics. We are based at the Institute of Science and Technology Austria.

(yes, we know)

After almost 5 years as a tenure-track professor at IST Austria, Misha Lemeshko has been promoted to Professor with tenure.

In collaboration with the experimental groups of Ronen Rapaport (Hebrew University Jerusalem) and of Paulo Santos (Paul Drude Institute, Berlin) we have demonstrated anisotropic dipole-dipole interactions between excitonic fluids created in semiconductor bilayers.

This paves the way to use indirect dipolar excitons as a new platform for quantum simulation of many-particle phenomena.

C. Hubert, Y. Baruchi, Y. Mazuz-Harpaz, K. Cohen, K. Biermann, M. Lemeshko, K. West, L. Pfeiffer, R. Rapaport, P. Santos

Attractive dipolar coupling between stacked exciton fluids

Phys. Rev. X **9**, 021026 (2019), arXiv:1807.11238

Recent dossier of the Austrian Presse Agentur “Zum Forschen Berufen” (in German) focuses on the life of scientists in modern academia.

The dossier features opinions of 13 Austrian scientists in the form of interviews and commentaries.

One of them was Misha Lemeshko with a guest commentary “…bis auf seinen Akzent” (in German)

Recent paper (in collaboration with Johan Mentink and Misha Katsnelson from RU Nijmegen, NL) describes how the angulon theory can be applied to treat angular momentum transfer between electrons and phonons in solids:

J. H. Mentink, M. I. Katsnelson, M. Lemeshko

Quantum many-body dynamics of the Einstein-de Haas effect,

Phys. Rev. B 99, 064428 (2019), arXiv:1802.01638

**Editor’s suggestion**

It was an honor for our group to contribute to the special issue of Molecular Physics dedicated to Nimrod Moiseyev‘s 70th birthday

X. Li, G. Bighin, E. Yakaboylu, M. Lemeshko

Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon

Molecular Physics (2019), arXiv:1810.10302

Happy birthday, Nimrod!

Giacomo Bighin has been awarded the prestigious Lise Meitner Fellowship from the Austrian Science Fund (FWF). Giacomo’s project “A path integral approach to composite impurities” (based on preliminary results he obtained working in the Lemeshko group), has been supported with funding for a two year postdoc salary plus additional expenses (~170,000 Euro in total).

Congratulations, Giacomo!

In collaboration with Mikhail Shkolnikov (algebraic geometry and topology group of Prof. Hausel), postdoc Enderalp Yakaboylu has shown that quantum particles interacting with a many-particle environment can be described using so-called “quantum groups” (or “q-deformed Lie algebras”). This provides an interesting new connection between condensed-matter physics and mathematics.

E. Yakaboylu, M. Shkolnikov, M. Lemeshko

Quantum groups as hidden symmetries of quantum impurities

Phys. Rev. Lett. **121**, 255302 (2018), arXiv:1809.00222

Postdocs Enderalp Yakaboylu and Bikashkali Midya (currently at U Penn) developed a theory of the “rotating polaron” (or the “moving angulon”) – an impurity possessing both translational and rotational degrees of freedom. The work was done in collaboration with the mathematical physicists Andreas Deuchert and Nikolai Leopold (group of Prof. Seiringer)

E. Yakaboylu, B. Midya, A. Deuchert, N. Leopold, M. Lemeshko

Theory of the Rotating Polaron: Spectrum and Self-Localization

Phys. Rev. B **98**, 224506 (2018), arXiv:1809.01204

The plot of the rotating polaron spectral function has been picked for the Phys. Rev. B Kaleidoscope collection

Postdoc Giacomo Bighin developed a diagrammatic Monte Carlo approach to quantum systems consisting of particles with angular momentum:

G. Bighin, T. V. Tscherbul, M. Lemeshko

Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems,

Phys. Rev. Lett. **121**, 165301 (2018); arXiv:1803.07990

**Press Coverage: **Phys.org, EurekAlert, ScienceDaily, (in English), Chemie.de, InnovationsReport (in German)