Physics at Virginia

"Probing correlations in fermionic triangular Hubbard systems"

Jirayu Mongkolkiattichai , University of Virginia - Department of Physics
[Host: Prof. Peter Schauss]

Quantum gas microscopes have expanded the understanding of many-particle physics with their unique ability of single atom resolved imaging. Quantum gas microscopes provide microscopic information of quantum many-body states through spatial correlation functions. Relying on the unique tunability of ultracold atoms in atomic interactions via Feshbach resonances, density, and spin-imbalance, we study a wide parameter range in the phase diagram. Interestingly, a triangular lattice is the simplest example of geometric frustration because three spins with antiferromagnetic interactions cannot be antiparallel, leading to large degeneracies in the many-body ground state [1]. In this talk, I present a Mott insulator of lithium-6 on a symmetric triangular lattice with a lattice spacing of 1003 nm. The lattice is imaged via a Raman sideband cooling technique with imaging fidelity of 98% [2]. We calibrated tunneling by extracting lattice depth from band excitation and the interaction is determined using doublon formation. We can access single-species singles components with the use of doublon hiding [3] and spin removal techniques [4] to detect spin-spin correlations. We compare the results to Determinantal Quantum Monte Carlo calculations, plan to investigate 120° Neel ordering in Heisenberg antiferromagnets, and search for quantum spin liquids in the triangular lattice Hubbard system.

[1] L. Balents, Nature 464, 7286 (2010).

[2] J. Yang, et al., PRX Quantum 2, 020344 (2021).

[3] P. T. Brown, et al., Science 357, 6358 (2017).

[4] M. F. Parsons, et al., Science 353, 1253 (2016). 

Condensed Matter Seminar
Thursday, April 14, 2022
4:00 PM
Clark Hall, Room G004
Note special time.
Note special room.

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