SKM 2021 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 11: Many-Body Quantum Dynamics II (joint session DY/TT)

DY 11.1: Talk

Thursday, September 30, 2021, 10:00–10:15, H2

Anderson localization of composite particles — •Fumika Suzuki¹, Mikhail Lemeshko², Wojciech Zurek³, and Roman Krems⁴ — ¹IST Austria (Institute of Science and Technology Austria) — ²IST Austria (Institute of Science and Technology Austria) — ³Los Alamos National Laboratory — ⁴University of British Columbia

We investigate the effect of coupling between translational and internal degrees of freedom of composite quantum particles on their localization in a random potential. We show that entanglement between the two degrees of freedom weakens localization due to the upper bound imposed on the inverse participation ratio by purity of a quantum state. We perform numerical calculations for a two-particle system bound by a harmonic force in a 1D disordered lattice and a rigid rotor in a 2D disordered lattice. We illustrate that the coupling has a dramatic effect on localization properties, even with a small number of internal states participating in quantum dynamics.

arXiv:2011.06279