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Diagrammatic Monte Carlo for electronic correlation in molecules: high-order many-body perturbation theory with low scaling

Autor: Bighin, G., Ho, Q. P., Lemeshko, M., Tscherbul, T. V.

We present a low-scaling diagrammatic Monte Carlo approach to molecular correlation energies. Using combinatorial graph theory to encode many-body Hugenholtz diagrams, we sample the M{\o}ller-Plesset (MPn) perturbation series, obtaining accurate corr

Externí odkaz: http://arxiv.org/abs/2203.12666

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Impurities in a one-dimensional Bose gas: the flow equation approach

Autor: Brauneis, F., Hammer, H. -W., Lemeshko, M., Volosniev, A. G.

Publikováno v: SciPost Phys. 11, 008 (2021)

A few years ago, flow equations were introduced as a technique for calculating the ground-state energies of cold Bose gases with and without impurities. In this paper, we extend this approach to compute observables other than the energy. As an exampl

Externí odkaz: http://arxiv.org/abs/2101.10958

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Attractive interactions, molecular complexes, and polarons in coupled dipolar exciton fluids

Autor: Hubert, C., Cohen, K., Ghazaryan, A., Lemeshko, M., Rapaport, R., Santos, P. V.

Publikováno v: Phys. Rev. B 102, 045307 (2020)

Dipolar (or spatially indirect) excitons (IXs) in semiconductor double quantum well (DQW) subjected to an electric field are neutral species with a dipole moment oriented perpendicular to the DQW plane. Here, we theoretically study interactions betwe

Externí odkaz: http://arxiv.org/abs/1910.06015

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

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

Publikováno v: Phys. Rev. Lett. 121, 165301 (2018)

We introduce a Diagrammatic Monte Carlo (DiagMC) approach to angular momentum properties of quantum many-particle systems possessing a macroscopic number of degrees of freedom. The treatment is based on a diagrammatic expansion that merges the usual

Externí odkaz: http://arxiv.org/abs/1803.07990

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

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

Publikováno v: Phys. Rev. B 99, 064428 (2019)

In 1915, Einstein and de Haas and Barnett demonstrated that changing the magnetization of a magnetic material results in mechanical rotation, and vice versa. At the microscopic level, this effect governs the transfer between electron spin and orbital

Externí odkaz: http://arxiv.org/abs/1802.01638

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Interaction-driven Lifshitz transition with dipolar fermions in optical lattices

Autor: van Loon, E. G. C. P., Katsnelson, M. I., Chomaz, L., Lemeshko, M.

Publikováno v: Phys. Rev. B 93, 195145 (2016)

Anisotropic dipole-dipole interactions between ultracold dipolar fermions break the symmetry of the Fermi surface and thereby deform it. Here we demonstrate that such a Fermi surface deformation induces a topological phase transition -- so-called Lif

Externí odkaz: http://arxiv.org/abs/1603.09358

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