Work

Nonthermal nonlinear many-body excitonic dynamics in high-purity silicon

Year: 2026

Type: article

Abstract: We report time-resolved optical pump-terahertz third-harmonic generation spectroscopy of picosecond nonthermal many-body charge dynamics in high-purity silicon at room temperature. Although in thermal equilibrium excitons in silicon are unstable due to a lower binding energy than the thermal energy at room temperature, following pulsed non-resonant optical pumping we can identify the formation of transient excitonic states on the picosecond time scale in our high-resolution nonlinear spectroscopic measurements. In contrast to unbound electron-hole pairs, the nonthermal many-body excitonic dynamics feature a characteristic time-dependent evolution, a distinct dependence on charge density, and a nonperturbative nonlinear terahertz response.

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

DOI: 10.1103/djnn-ct5d

Authors: Patrick Pilch, Siyu Duan, Yang Liu, Manfred Bayer, Marc Assmann, Zhe Wang

Institutions: TU Dortmund University, Zhejiang University

Language: English

Topic: Terahertz technology and applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, European Research Council, Horizon 2020

Awards: G2627701451, G4218994261, G5199782411