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

A quantum phase transition may occur in the ground state of a system at zerotemperature when a controlling field or interaction is varied. The resultingquantum fluctuations which trigger the transition produce scaling behavior ofvarious observables, governed by universal critical exponents. A particularlyinteresting class of such transitions appear in systems with quantum impuritieswhere a non-extensive term in the free energy becomes singular at the criticalpoint. Curiously, the notion of a conventional order parameter which exhibitsscaling at the critical point is generically missing in these systems. We hereexplore the possibility to use the Schmidt gap, which is an observable obtainedfrom the entanglement spectrum, as an order parameter. A case study of thetwo-impurity Kondo model confirms that the Schmidt gap faithfully captures thescaling behavior by correctly predicting the critical exponent of thedynamically generated length scale at the critical point.

An order parameter for impurity systems at quantum criticality