Theorists working at the interface of condensed matter, chemical, and atomic physics. We are based at the Institute of Science and Technology Austria.
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)
With the new ERC funding available, the Lemeshko group has several new openings for Postdoc and Ph.D. positions. Please send your application documents directly to Prof. Lemeshko.
In this round of awards, one Starting Grant of the European Research Council goes to Professor Mikhail Lemeshko, a theoretical physicist who has been working at IST Austria since 2014. In his project, which the ERC will support with about 1.5 million Euro, he will establish a general theory of a quasiparticle, the angulon, that he discovered during his time at IST Austria. The angulon quasiparticle is expected to help tackle previously unsolvable problems in various fields, ranging from physical chemistry to the technology of data storage.
More details at the IST website (German version)
E. Yakaboylu, M. Lemeshko
Anyonic statistics of quantum impurities in two dimensions,
Phys. Rev. B 98, 045402 (2018), preprint available at arXiv:1712.00308
During his ISTernship and lab rotation in our group, Wojciech has demonstrated that it’s possible to control angular momentum transfer between a molecule and a quantum solvent using a magnetic field. Furthermore, it seems possible to create phonons with preordained angular momentum!
W. Rzadkowski, M. Lemeshko
Effect of a magnetic field on molecule-solvent angular momentum transfer
J. Chem. Phys. 148, 104307 (2018), arXiv:1711.09904
Enderalp has been awarded the Outstanding Scientific Achievement Award at IST Austria for the important results he published in 2017, including:
Congratulations, Enderalp!
Enderalp Yakaboylu (Lemeshko group) and Andreas Deuchert (Seiringer group) demonstrated that a molecule rotating inside a superfluid behaves as a non-Abelian magnetic monopole.
E. Yakaboylu, A. Deuchert, M. Lemeshko
Emergence of non-abelian magnetic monopoles in a quantum impurity problem,
Phys. Rev. Lett. 119, 235301 (2017), arXiv:1705.05162
Press coverage: Gismodo, Phys.org, ScienceDaily, EurekAlert, Science Newsline, Sott.net, Resonance.is, Space Daily (in English); der Standard, Pro-Physik, Austria Presse Agentur, Informationsdienst Wissenschaft, Innovations Report, OE Journal, Jura Forum (in German); Webtechno (in Turkish), Egno (in Greek), Dailytechinfo.org (in Russian)