High harmonic generation in monolayer MoS2 controlled by resonant and near-resonant pulses on ultrashort time scales

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU148971" target="_blank" >RIV/00216305:26620/23:PU148971 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.aip.org/aip/app/article/8/8/086103/2905253/High-harmonic-generation-in-monolayer-MoS2" target="_blank" >https://pubs.aip.org/aip/app/article/8/8/086103/2905253/High-harmonic-generation-in-monolayer-MoS2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0158995" target="_blank" >10.1063/5.0158995</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High harmonic generation in monolayer MoS2 controlled by resonant and near-resonant pulses on ultrashort time scales

Popis výsledku v původním jazyce

We report on experimental investigation of nonperturbative high harmonic generation (HHG) in monolayer MoS2 in the ultraviolet spectral region driven by mid-infrared light. We study how the HHG is influenced by pre-excitation of the monolayer using resonant and near-resonant pulses in a pump-probe-like scheme. The resonant light creates high density exciton population. Due to ultrafast dephasing caused by electron-electron scattering, the HHG is suppressed in the presence of pre-excited carriers. In the case of near-resonant excitation with photon energy below the exciton transition, the dynamics of the observed suppression of the HHG yield contains a fast component, which is a consequence of momentum scattering at carriers, which are excited by two-photon transition when the two pulses temporally overlap in the sample. This interpretation is supported by comparing the experimental data with theoretical calculations of the two-photon absorption spectrum of the MoS2 monolayer. This work demonstrates a possibility to control HHG in low-dimensional materials on ultrashort timescales by combining the driving strong-field pulse with a weak near-resonant light.

Název v anglickém jazyce

High harmonic generation in monolayer MoS2 controlled by resonant and near-resonant pulses on ultrashort time scales

Popis výsledku anglicky

We report on experimental investigation of nonperturbative high harmonic generation (HHG) in monolayer MoS2 in the ultraviolet spectral region driven by mid-infrared light. We study how the HHG is influenced by pre-excitation of the monolayer using resonant and near-resonant pulses in a pump-probe-like scheme. The resonant light creates high density exciton population. Due to ultrafast dephasing caused by electron-electron scattering, the HHG is suppressed in the presence of pre-excited carriers. In the case of near-resonant excitation with photon energy below the exciton transition, the dynamics of the observed suppression of the HHG yield contains a fast component, which is a consequence of momentum scattering at carriers, which are excited by two-photon transition when the two pulses temporally overlap in the sample. This interpretation is supported by comparing the experimental data with theoretical calculations of the two-photon absorption spectrum of the MoS2 monolayer. This work demonstrates a possibility to control HHG in low-dimensional materials on ultrashort timescales by combining the driving strong-field pulse with a weak near-resonant light.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

APL Photonics

ISSN

2378-0967

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

„“-„“

Kód UT WoS článku

001048682100006

EID výsledku v databázi Scopus

2-s2.0-85166917019