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Journal Club for Condensed Matter Physics

Spin and charge correlations in the Hubbard model: a cold atoms perspective

Published Jul 31, 2016• 0 citations
Publisher

Abstract

1. Site-resolved observations of antiferromagnetic correlations in the Hubbard model. Authors: M. F. Parsons, A. Mazurenko, C.S. Chiu, G. Ji, D. Greif, and M. Greiner. arXiv:1605.02704 2. Spin and Charge Resolved Quantum Gas Microscopy of Antiferromagnetic Order in Hubbard Chains. Authors:Martin Boll, Timon A. Hilker, Guillaume Salomon, Ahmed Omran, Immanuel Bloch, and Christian Gross. arXiv:1605.05661 […]

DOI
10.36471/jccm_july_2016_01

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The repulsive Hubbard Hamiltonian is one of the foundational models describing strongly correlated electrons and is believed to capture essential aspects of high-temperature superconductivity. Ultracold fermions in optical lattices allow for the simulation of the Hubbard Hamiltonian with control over kinetic energy, interactions, and doping. A great challenge is to reach the required low entropy and to observe antiferromagnetic spin correlations beyond nearest neighbors, for which quantum gas microscopes are ideal. Here, we report on the direct, single-site resolved detection of antiferromagnetic correlations extending up to three sites in spin-1/2 Hubbard chains, which requires entropies per particle well below s* = ln(2). The simultaneous detection of spin and density opens the route toward the study of the interplay between magnetic ordering and doping in various dimensions.