Exciton Enhanced Giant Correlated Stoke AntiStokes Scattering of Multiorder Phonons in Semiconductor

TL;DR

This paper demonstrates giant correlated multiorder Stokes anti-Stokes scattering in ZnTe nanobelts at low power, significantly enhancing SaS correlation and reducing heating, advancing quantum information applications.

Contribution

It reveals a new exciton-resonant Raman scattering mechanism enabling strong multiorder SaS correlations at low power in semiconductors.

Findings

Strong anti-Stokes signals observed at low temperatures.

SaS correlations are 2-4 orders of magnitude larger than previous reports.

Mitigation of laser heating effects in SaS scattering.

Abstract

The correlated Stoke antiStokes (SaS) scattering plays a crucial role in quantum information processing, such as heralded light sources, Fock state dynamics, and write read protocol for quantum memory. However, several reported materials exhibit low degree of SaS correlation and require high-power pulse laser excitation, limiting further applications. Herein, we explore the giant correlated multiorder SaS scattering under low power continuous laser excitation through red-sideband resonance of exciton in semiconductor ZnTe nanobelts. At low temperatures, we observe an unexpectedly strong anti-Stokes signal for multiorder longitudinal optical phonons, with SaS correlations two or four orders of magnitude larger than reported results. Furthermore, we observed the mitigation of laser heating effect for longitudinal optical phonon in SaS scattering. This finding paves a new pathway to study multiorder quantum correlated photon pairs produced through exciton-resonant Raman scattering.