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

Three-dimensional (3D) topological insulators (TIs) are new forms of quantummatter that are characterized by their insulating bulk state and exoticmetallic surface state, which hosts helical Dirac fermions1-2. Very recently,BiTeCl, one of the polar semiconductors, has been discovered by angle-resolvedphotoemission spectroscopy to be the first strong inversion asymmetrictopological insulator (SIATI). In contrast to the previously discovered 3D TIswith inversion symmetry, the SIATI are expected to exhibit novel topologicalphenomena, including crystalline-surface-dependent topological surface states,intrinsic topological p-n junctions, and pyroelectric and topologicalmagneto-electric effects3. Here, we report the first transport evidence for therobust topological surface state in the SIATI BiTeCl via observation ofShubnikov-de Haas (SdH) oscillations, which exhibit the 2D nature of the Fermisurface and pi Berry phase. The n = 1 Landau quantization of the topologicalsurface state is observed at B . 12 T without gating, and the Fermi level isonly 58.8 meV above the Dirac point, which gives rise to small effective mass,0.055me, and quite large mobility, 4490 cm2s-1. Our findings will pave the wayfor future transport exploration of other new topological phenomena andpotential applications for strong inversion asymmetric topological insulators.

Transport evidence of robust topological surface state in BiTeCl single crystals, the first strong inversion asymmetric topological insulator