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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Topological quantum phases cannot be characterized by local order parametersin the bulk. In this work however, we show that signatures of a topologicalquantum critical point do remain in local observables in the bulk, and manifestthemselves as non-analyticities in their expectation values taken over a familyof non-equilibrium states generated using a quantum quench protocol. Thesignature can be used for precisely locating the critical points in parameterspace. A large class of initial states can be chosen for the quench (includingfinite temperature states), the sufficient condition being existence of afinite occupation-gradient with respect to energy for the single-particlecritical mode. We demonstrate these results in tractable models ofnon-interacting fermions exhibiting topological phase transitions in one andtwo spatial dimensions. We also show that the non-analyticities can be absentif the gap-closing is non-topological, i.e., when it corresponds to no phasetransition.

Locating topological phase transitions using nonequilibrium signatures in local bulk observables