Work

Internal dynamics and dielectric screening of confined multiexciton states

Year: 2025

Type: article

Abstract: Recent experimental and computational studies suggest that biexcitons (BX) confined in large CsPbBr$_3$ nanocrystals experience reduced dielectric screening as compared to excitons (X) and trions (X$^*$). Here we provide a physical rationale to explain such a behavior. A characteristic frequency is introduced, which describes the internal dynamics of an exciton within the excitonic complex. By means of effective mass--variational Quantum Monte Carlo simulations, we show that, in large nanocrystals, the frequency is similar for X and X$^*$, but smaller for BX. Because the frequencies exceed that of the bulk longitudinal optical phonon, this leads to a reduced dielectric constant for BX, which is in contrast with the behavior of strongly confined nanocrystals.

Source: Physical review. B./Physical review. B

DOI: 10.1103/wtz4-w32g

Authors: Josep Planelles, Juan I. Climente, José L. Movilla

Institution: Universitat Jaume I

Language: English

Topic: Semiconductor Quantum Structures and Devices

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: European Regional Development Fund

Award: G1074187203