New paper in Phys. Rev. X

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

Lise Meitner fellowship for Giacomo Bighin

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!

Paper in Phys. Rev. Lett.

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

Paper in Phys. Rev. B

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

Paper in Phys. Rev. Lett.

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.orgEurekAlert, ScienceDaily, (in English), Chemie.de, InnovationsReport (in German)

ERC Starting Grant for Mikhail Lemeshko

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)