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 propose a new type of Hopf semimetals indexed by a pair of numbers$(p,q)$, where the Hopf number is given by $pq$. The Fermi surface is given bythe preimage of the Hopf map, which is nontrivially linked for a nonzero Hopfnumber. The Fermi surface forms a torus link, whose examples are the Hopf linkindexed by $(1,1)$, the Solomon's knot $(2,1)$, the double Hopf-link $(2,2)$and the double trefoil-knot $(3,2)$. We may choose $p$ or $q$ as a halfinteger, where torus-knot Fermi surfaces such as the trefoil knot $(3/2,1)$ arerealized. It is even possible to make the Hopf number an arbitrary rationalnumber, where a semimetal whose Fermi surface forms open strings is generated.

Topological Semimetals carrying Arbitrary Hopf Numbers: Hopf-Link, Solomon's-Knot, Trefoil-Knot and Other Semimetals