Direct Probing of the Mott Crossover in the SU(N) Fermi-Hubbard Model
Autor: | Christian Hofrichter, Luis Riegger, Francesco Scazza, Moritz Höfer, Diogo Rio Fernandes, Immanuel Bloch, Simon Fölling |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: | |
Zdroj: | Physical Review X, Vol 6, Iss 2, p 021030 (2016) |
Druh dokumentu: | article |
ISSN: | 2160-3308 64624943 |
DOI: | 10.1103/PhysRevX.6.021030 |
Popis: | We report on a detailed experimental investigation of the equation of state (EoS) of the three-dimensional Fermi-Hubbard model (FHM) in its generalized SU(N)-symmetric form, using a degenerate ytterbium gas in an optical lattice. In its more common spin-1/2 form, the FHM is a central model of condensed-matter physics. The generalization to N>2 was first used to describe multi-orbital materials and is expected to exhibit novel many-body phases in a complex phase diagram. By realizing and locally probing the SU(N) FHM with ultracold atoms, we obtain model-free access to thermodynamic quantities. The measurement of the EoS and the local compressibility allows us to characterize the crossover from a compressible metal to an incompressible Mott insulator. We reach specific entropies above Néel order but below that of uncorrelated spins. Having access to the EoS of such a system represents an important step towards probing predicted novel SU(N) phases. |
Databáze: | Directory of Open Access Journals |
Externí odkaz: |