Observation of Nagaoka polarons in a Fermi–Hubbard quantum simulator

M Lebrat, M Xu, LH Kendrick, A Kale, Y Gang… - Nature, 2024‏ - nature.com
Quantum interference can deeply alter the nature of many-body phases of matter. In the
case of the Hubbard model, Nagaoka proved that introducing a single itinerant charge can …

Directly imaging spin polarons in a kinetically frustrated Hubbard system

ML Prichard, BM Spar, I Morera, E Demler, ZZ Yan… - Nature, 2024‏ - nature.com
The emergence of quasiparticles in quantum many-body systems underlies the rich
phenomenology in many strongly interacting materials. In the context of doped Mott …

Observation of spin polarons in a frustrated moiré Hubbard system

Z Tao, W Zhao, B Shen, T Li, P Knüppel, K Watanabe… - Nature Physics, 2024‏ - nature.com
The electron's kinetic energy plays a pivotal role in magnetism. While virtual electron
hop** promotes antiferromagnetism in an insulator, real hop** processes usually favour …

High-temperature kinetic magnetism in triangular lattices

I Morera, M Kanász-Nagy, T Smolenski, L Ciorciaro… - Physical Review …, 2023‏ - APS
We study kinetic magnetism for the Fermi-Hubbard model in triangular lattices. We focus on
the regime of strong interactions, U≫ t, and filling factors around one electron per site. For …

Tunable exciton valley-pseudospin orders in moiré superlattices

R ** and kinetic magnetism
KS Kim, I Esterlis, C Murthy, SA Kivelson - Physical Review B, 2024‏ - APS
We study the quantum dynamics of interstitials and vacancies in a two-dimensional Wigner
crystal (WC) using a semiclassical instanton method that is asymptotically exact at low …

Chiral pseudospin liquids in moiré heterostructures

C Kuhlenkamp, W Kadow, A Imamoğlu, M Knap - Physical Review X, 2024‏ - APS
We propose multilayer moiré structures in strong external magnetic fields as a novel platform
for realizing highly tunable, frustrated Hubbard physics with topological order. Identifying the …