Voltage-Regulated Photoluminescence Modulation in a 0D-2D Mixed Dimensional Heterostructure

TL;DR

This study reports bias-dependent oscillations in photoluminescence, photocurrent, and photo capacitance in a 0D-2D heterostructure, revealing quantum phenomena and potential for exciton-based optoelectronic devices.

Contribution

It demonstrates voltage-regulated photoluminescence modulation and uncovers large-scale quantum oscillations in a mixed dimensional heterostructure.

Findings

Oscillations in photoluminescence, photocurrent, and capacitance are bias-dependent.

Oscillations persist over macroscopic areas (~200 microns).

Indicates competition between coherent and incoherent electron tunnelling.

Abstract

Bias dependent oscillations in excitonic photoluminescence are observed in a mixed dimensional 0D 2D heterostructure. These oscillations arise from modulation by oscillatory DC photocurrent, which exhibits periodic negative differential resistance, indicating recurring charge accumulation within the heterostructure. The persistence of these oscillations across a macroscopic area of diameter around 200 microns suggests the presence of periodically correlated quantum phenomena over large length scales. Furthermore, bias dependent oscillations in the photo capacitance are observed, reflecting a periodic ordering and disordering of excitonic populations. Together, these observations point to a direct competition between coherent and incoherent electron tunnelling processes. The coupled oscillatory behaviour of photoluminescence, photocurrent, and photo capacitance highlights new opportunities for exciton-based quantum optoelectronic devices.