Excitons in monolayer transition metal dichalcogenides : laser annealing and coherent feedback control of radiative coupling
Abstract/Contents
- Abstract
- Recently there has been great interest in the monolayer transition metal dichalcogenides (TMDs) and their optical properties. The strong and spectrally narrow excitonic feature exhibited in high quality samples of these materials is of interest for optical devices and optical/excitonic physics. I will present results from several experiments related to excitons in the monolayer TMD MoSe2. First, a laser annealing process for the monolayer TMD MoSe2 which greatly improves the optical properties of suspended chemical-vapor-deposition grown samples is presented. This method removes surface contaminants/dopants and eliminates strain gradients. Surprisingly, the exciton resonance in these annealed samples is radiatively broadened and its quality is comparable to that of state-of- the-art samples prepared by encapsulation in hexagonal boron nitride. The annealing procedure has the potential to enable high quality, large area samples. Results from experiments in which a metal mirror is brought into close proximity with an MoSe2 monolayer will also be presented. The emission of the excitonic dipole is coherently fed back to itself with a variable phase depending on mirror position. This allows for control over the radiative coupling from near zero to 1.8 meV, and also leads to a change in total linewidth of 2.5 X. In contrast to previous experiments in other materials systems such as quantum dots and cold atoms, the transverse coherence of the 2D exciton allows for significant modulation of the radiative coupling at distances relatively far from the mirror. This experiment provides very direct evidence of the radiatively broadened nature of MoSe2 excitons. It also provides information about the relatively large transverse coherence of the excitonic wavefunction.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Rogers, Christopher Martin Sinclair |
|---|---|
| Degree supervisor | Mabuchi, Hideo |
| Thesis advisor | Mabuchi, Hideo |
| Thesis advisor | Miller, D. A. B |
| Thesis advisor | Vuckovic, Jelena |
| Degree committee member | Miller, D. A. B |
| Degree committee member | Vuckovic, Jelena |
| Associated with | Stanford University, Department of Electrical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Christopher M. S. Rogers. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Christopher Martin Sinclair Rogers
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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