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

Coherent optical spectroscopy such as four-wave mixing and photon echogeneration deliver detailed information on the energy levels involved inoptical transitions through the analysis of polarization of the coherentresponse. In semiconductors, it can be applied to distinguish between differentexciton complexes, which is a highly non-trivial problem in opticalspectroscopy. We develop a simple approach based on photon echo polarimetry, inwhich polar plots of the photon echo amplitude are measured as function of theangle $\varphi$ between the linear polarizations of the two exciting pulses.The rosette-like polar plots reveal a distinct difference between the neutraland charged exciton (trion) optical transitions in semiconductornanostructures. We demonstrate this experimentally by photon echo polarimetryof a 20-nm-thick CdTe/(Cd,Mg)Te quantum well at temperature of 1.5~K. Applyingnarrow-band optical excitation we selectively excite different excitoncomplexes including the exciton, the trion, and the donor-bound exciton D$^0$X.We find that polarimetry of the photon echo on the trion and D$^0$X issubstantially different from the exciton: The echoes of the trion and D$^0$Xare linearly polarized at the angle $2\varphi$ with respect to the first pulsepolarization and their amplitudes are weakly dependent on $\varphi$. While onthe exciton the photon echo is co-polarized with the second exciting pulse andits amplitude scales as $\cos\varphi$.

Polarimetry of photon echo on charged and neutral excitons in CdTe/(Cd,Mg)Te quantum wells