Boehler, Annika and Schloemer, Henning and Schollwoeck, Ulrich and Bohrdt, Annabelle and Grusdt, Fabian (2025) Probing a modified Luttinger sum rule in the strongly interacting one-dimensional Fermi-Hubbard model. PHYSICAL REVIEW B, 111 (4): 045107. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
Fermi surface reconstruction in cuprates can lead to an abrupt change in the Fermi momentum kF between different phases. This phenomenon remains a subject of debate and is at the heart of an ongoing discussion about the nature of the metallic state in the pseudogap regime. Here we study a minimal model of a kF changing crossover in the one-dimensional Fermi-Hubbard model, where a tuning of the on-site interaction leads to a crossover between a spin-1/2 Luttinger liquid with small Fermi momentum and a spinless chargon liquid with large Fermi momentum. We attribute this to an emergent U (1) symmetry in the strongly correlated limit, which can be used to derive a modified Luttinger sum rule recovering the large Fermi momentum. We analyze Friedel oscillations at the edge of a system to directly probe the change of Fermi momentum at zero and nonzero temperature. This paves the way for a direct experimental observation of changes of the Fermi momentum using ultracold fermions in a quantum gas microscope, with possible extensions to higher dimensional systems.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM OSCILLATIONS; DENSITY; PSEUDOGAP; SURFACE; THEOREM; PHYSICS; ATOMS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 May 2026 11:36 |
| Last Modified: | 26 May 2026 11:36 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67432 |
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