English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We show that the dilute Fermi gas quantum critical universality classquantitatively describes the Mott/metal crossover of the two-dimensionalHubbard model for temperatures somewhat less than (roughly half) the tunnelingbut much greater than (roughly twice) the superexchange energy. We calculatethe observables expected to be universal near the transition --- density andcompressibility --- with numerically exact determinantal quantum Monte Carlo.We find they are universal functions of the chemical potential. Despite arisingfrom the strongly correlated regime of the Hubbard model, these functions aregiven by the weakly interacting, dilute Fermi gas model. These observables andtheir derivatives are the only expected universal static observables of thisuniversality class, which we also confirm by verifying there is no scalingcollapse of the kinetic energy, fraction of doubly occupied sites, and nearestneighbor spin correlations. Our work resolves the universality class of theintermediate temperature Mott/metal crossover, which had alternatively beenproposed to be described by more exotic theories. However, in the presence of aZeeman magnetic field, we find that interplay of spin with itinerant charge canlead to physics beyond the dilute Fermi gas universality class.

Universality class of quantum criticality in the two-dimensional Hubbard model at intermediate temperatures ($t^2/U\ll T\ll t$)