Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 17: Ultracold atoms, ions, and BEC IV (joint session A/Q)

A 17.3: Talk

Wednesday, March 11, 2020, 11:45–12:00, f303

Strongly correlated Bose-Einstein Condensates with spin-orbit coupling of the Rashba-Dresselhaus type — •Clemens Staudinger and Robert E. Zillich — Institute for Theoretical Physics, Johannes Kepler University Linz, Austria

In a Bose-Einstein condensate (BEC) it is possible to couple two internal states (pseudospin up and down) in a way that the resulting Hamiltonian contains a coupling between the linear momentum and the pseudospin (Rashba-Dresselhaus coupling). Experimentally this has been achieved by irradiating the BEC with lasers of different frequencies. Such BECs have been treated extensively within mean-field theories [1]. Instead, we propose a new variational Hyper-Netted-Chain method, which accounts for correlations nonperturbatively, but is orders of magnitude faster than quantum Monte-Carlo simulations [2]. With our method we a able to accurately calculate properties of the ground-state of the BEC such as the pair-distribution function, the structure factor and other thermodynamic quantities such as the energy or the chemical potential.

[1] Y.-J. Lin, K. Jiménez-García and I. B. Spielman, Nature 471, 83 (2011).

[2] A. Ambrosetti, P. L. Silvestrelli, F. Toigo, L. Mitas, and F. Pederiva, Phys. Rev. B 85, 045115 (2012).