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Q: Fachverband Quantenoptik und Photonik
Q 18: Quantum Gases (Bosons) II
Q 18.6: Talk
Monday, March 5, 2018, 15:15–15:30, K 2.020
A Diagrammatic Monte Carlo study of a composite, rotating impurity — •Giacomo Bighin1, Timur Tscherbul2, and Mikhail Lemeshko1 — 1IST Austria (Institute of Science and Technology Austria), Am Campus 1, 3400 Klosterneuburg, Austria — 2Department of Physics, University of Nevada, Reno, NV, 89557, USA
The angulon quasiparticle [1], formalizing the concept of a composite, rotating impurity interacting with a quantum many-body environment, has proven useful in the description of several experimental settings: cold molecules in a Bose-Einstein condensate or embedded in helium nanodroplets, electronic excitations in a BEC or in a solid.
Recently it has been shown that the angulon can be understood using a diagrammatic formalism [2], fusing Feynman diagrams with the angular momentum diagrams used in atomic and nuclear structure calculations. Based on this formalism, we present a comprehensive Diagrammatic Monte Carlo (DiagMC) study of the angulon.
The techniques we introduce open up the possibility of studying the angulon at arbitrary coupling strength, and are compared with existing weak- and strong- coupling analytical theories for the angulon [1]. The present work paves the way for using DiagMC techniques in the study of many-body systems comprising complex, rotating impurities, establishing a far-reaching connection between DiagMC techniques and molecular simulations.
[1] R. Schmidt and M. Lemeshko, Phys. Rev. Lett. 114, 203001 (2015) and Phys. Rev. X 6, 011012 (2016). [2] G. Bighin and M. Lemeshko, Phys. Rev. B 96, 419 (2017).