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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
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Rydberg Excitons and Trions in Monolayer MoTe2
Souvik Biswas1,2, Aurélie Champagne3,4, Jonah B Haber4
1Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States.
ACS Nano
|April 12, 2023
Summary
Researchers explored excitonic Rydberg series in monolayer molybdenum ditelluride (MoTe2) using luminescence. They quantified exciton-phonon coupling and observed tunable exciton-trion interactions, paving the way for MoTe2 optoelectronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Optoelectronics
Background:
- Monolayer transition metal dichalcogenides (TMDCs) possess strong excitonic resonances crucial for probing material properties.
- Excitonic Rydberg series, analogous to the hydrogen atom, are well-studied in many TMDCs but underexplored in MoTe2.
- Molybdenum ditelluride (MoTe2) is an important TMDC with potential for optoelectronic applications.
Purpose of the Study:
- To experimentally investigate the excitonic luminescence properties of monolayer MoTe2.
- To understand the excitonic Rydberg series, up to the 3s state, in monolayer MoTe2.
- To explore the temperature-dependent emission energies and exciton-phonon coupling in MoTe2.
Main Methods:
- Experimental investigation of excitonic luminescence.
- Temperature-dependent measurements from 4 K to 300 K.
- First-principles GW plus Bethe-Salpeter equation approach calculations.
Main Results:
- Observed and characterized excitonic Rydberg series up to the 3s state in monolayer MoTe2.
- Quantified significant modification of emission energies with temperature, indicating exciton-phonon coupling.
- Demonstrated strongly gate-tunable exciton-trion interplay governed by screening, Pauli blocking, and band gap renormalization.
Conclusions:
- Monolayer MoTe2 exhibits a rich excitonic Rydberg series and significant exciton-phonon coupling.
- Exciton-trion interactions are tunable via gate voltage, consistent with theoretical predictions.
- These findings advance the understanding of MoTe2 and support its application in near-infrared optoelectronics and photonics.
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