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

In two-dimensional topological insulators, such as inverted HgTe/CdTe quantumwells, helical quantum spin Hall (QSH) states persist even at finite magneticfields below a critical magnetic field $B_\mathrm{c}$, above which only quantumHall (QH) states can be found. Using linear-response theory, we theoreticallyinvestigate the magneto-optical properties of inverted HgTe/CdTe quantum wells,both for infinite two-dimensional and finite-strip geometries, and possiblesignatures of the transition between the QSH and QH regimes. In the absorptionspectrum, several peaks arise due to non-equidistant Landau levels in bothregimes. However, in the QSH regime, we find an additional absorption peak atlow energies in the finite-strip geometry. This peak arises due to the presenceof edge states in this geometry and persists for any Fermi level in the QSHregime, while in the QH regime the peak vanishes if the Fermi level is situatedin the bulk gap. Thus, by sweeping the gate voltage, it is possible toexperimentally distinguish between the QSH and QH regimes due to thissignature. Moreover, we investigate the effect of spin-orbit coupling andfinite temperature on this measurement scheme.

Probing topological transitions in HgTe/CdTe quantum wells by magneto-optical measurements