期刊
ADVANCED SCIENCE
卷 9, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/advs.202103813
关键词
nonlinear spectroscopy; photon echo; transition metal dichalcogenides
资金
- German Academic Exchange Service (DAAD) [57504619]
- Polish National Agency for Academic Exchange (NAWA) [PPN/ULM/2019/1/00064]
- NAWA under an APM grant [PPI/APM/2019/1/00085]
- CNRS via IRP 2D materials
- TEAM programme of the Foundation for Polish Science
- EU within the ERDFund
- ESF [CZ.02.2.69/0.0/0.0/20_079/0017436]
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [19H05790, JP20H00354]
Monolayers of transition metal dichalcogenides exhibit strong excitonic optical response and when encapsulated with hexagonal boron nitride, they can achieve a purely homogeneously broadened exciton system. Ultrafast six-wave mixing spectroscopy on a MoSe2-based system revealed a novel destructive photon echo effect, which arises from destructive interference in successive repetitions of the heterodyning experiment.
Monolayers of transition metal dichalcogenides display a strong excitonic optical response. Additionally encapsulating the monolayer with hexagonal boron nitride allows to reach the limit of a purely homogeneously broadened exciton system. On such a MoSe2-based system, ultrafast six-wave mixing spectroscopy is performed and a novel destructive photon echo effect is found. This process manifests as a characteristic depression of the nonlinear signal dynamics when scanning the delay between the applied laser pulses. By theoretically describing the process within a local field model, an excellent agreement with the experiment is reached. An effective Bloch vector representation is developed and thereby it is demonstrated that the destructive photon echo stems from a destructive interference of successive repetitions of the heterodyning experiment.
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