Coherent light-matter interactions in monolayer transition-metal dichalcogenides / Edbert Jarvis Sie.
Sie, Edbert Jarvis.
2018
QD509.M65
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Title Coherent light-matter interactions in monolayer transition-metal dichalcogenides / Edbert Jarvis Sie.
Author Sie, Edbert Jarvis.
ISBN 9783319695549 (electronic book)
3319695541 (electronic book)
9783319695532
3319695533
DOI https://doi.org/10.1007/978-3-319-69554-9
Publication Details Cham : Springer, ©2018.
Language English
Description 1 online resource (142 pages).
Item Number 10.1007/978-3-319-69554-9 doi
Call Number QD509.M65
Dewey Decimal Classification 530.4/175
530
Summary This thesis presents optical methods to split the energy levels of electronic valleys in transition-metal dichalcogenides (TMDs) by means of coherent light-matter interactions. The electronic valleys present in monolayer TMDs such as MoS2, WS2, and WSe2 are among the many novel properties exhibited by semiconductors thinned down to a few atomic layers, and have have been proposed as a new way to carry information in next generation devices (so-called valleytronics). These valleys are, however, normally locked in the same energy level, which limits their potential use for applications. The author describes experiment performed with a pump-probe technique using a transient absorption spectroscopy on MoS2 and WS2. It is demonstrated that hybridizing the electronic valleys with light allows one to optically tune their energy levels in a controllable valley-selective manner. In particular, by using off-resonance circularly polarized light at small detuning, one can tune the energy level of one valley through the optical Stark effect. Also presented within are observations, at larger detuning, of a separate contribution from the so-called Bloch--Siegert effect, a delicate phenomenon that has eluded direct observation in solids. The two effects obey opposite selection rules, enabling one to separate the two effects at two different valleys.
Note 7.7.1 Microscopic Many-Body Computation.
Bibliography, etc. Note Includes bibliographical references.
Access Note Access limited to authorized users.
Digital File Characteristics text file PDF
Source of Description Description based on print version record.
Series Springer theses.
Available in Other Form Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides.
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Supervisorś Foreword; Preface; Parts of this Thesis Have Been Published in the Following Journal Articles; Acknowledgments; Contents; Chapter 1: Introduction; 1.1 Monolayer Transition Metal Dichalcogenides (TMDs); 1.1.1 Electronic Band Structure; 1.1.2 Optical Selection Rules; 1.1.3 Excitons; 1.2 Time-Resolved Spectroscopy; 1.2.1 Coherent Light-Matter Interactions; 1.2.2 Quasi-equilibrium Dynamics; References; Chapter 2: Time-Resolved Absorption Spectroscopy; 2.1 Experimental Setup; 2.1.1 Overview; 2.1.2 Laser Amplifier; 2.1.3 Optical Parametric Amplifier; 2.1.4 White Light Continuum.

2.2 Data Analysis2.2.1 Kramers-Kronig Analysis; 2.2.2 Maxwellś Equations for Monolayer Sample; References; Chapter 3: Intervalley Biexcitons in Monolayer MoS2; 3.1 Intervalley Biexcitons; 3.2 Experimental Methods; 3.3 Experimental Results and Discussions; 3.3.1 Intravalley and Intervalley Scattering; 3.3.2 Signature of Intervalley Biexcitons; 3.4 Time-Resolved Cooling Process; 3.5 Conclusions; References; Chapter 4: Valley-Selective Optical Stark Effect in Monolayer WS2; 4.1 Optical Stark Effect; 4.1.1 Semiclassical Description; 4.1.2 Quantum-Mechanical Description; 4.2 Experimental Methods.

4.3 Observation of the Optical Stark Effect4.4 Valley Selectivity; 4.5 Fluence and Detuning Dependences; 4.6 Proposal: Valley-Specific Floquet Topological Phase in TMDs; 4.7 Supplementary; 4.7.1 Time-Resolved Spectra; 4.7.2 Polarization-Resolved Spectra; 4.7.3 Obtaining Energy Shift; 4.7.4 Comparison from Semiclassical Theory; References; Chapter 5: Intervalley Biexcitonic Optical Stark Effect in Monolayer WS2; 5.1 Blue-Detuned Optical Stark Effect; 5.2 Experimental Methods; 5.3 Experimental Results and Data Analysis; 5.4 Intervalley Biexcitonic Optical Stark Effect.

5.4.1 Four-Level Jaynes-Cummings Model5.5 Perspective: Zeeman-Type Optical Stark Effect; 5.6 Supplementary; 5.6.1 Coherent and Incoherent Optical Signals; 5.6.2 Time-Trace Fitting Decomposition Analysis; 5.6.3 Possible Effects Under Red-Detuned Pumping; 5.6.4 Fitting Analysis; References; Chapter 6: Large, Valley-Exclusive Bloch-Siegert Shift in Monolayer WS2; 6.1 Bloch-Siegert Shift; 6.1.1 Semiclassical Description; 6.1.2 Quantum-Mechanical Description; 6.2 Experimental Methods; 6.3 Observation of the Bloch-Siegert Shift; 6.4 Fluence and Detuning Dependences.

6.5 Valley-Exclusive Optical Stark Shift and Bloch-Siegert Shift6.6 Conclusions; References; Chapter 7: Lennard-Jones-Like Potential of 2D Excitons in Monolayer WS2; 7.1 Many-Body Interactions in 2D TMDs; 7.2 Experimental Methods; 7.3 Optical Signature of Many-Body Effects; 7.3.1 Exciton Redshift-Blueshift Crossover; 7.3.2 At Low Density: Plasma Contribution; 7.3.3 At High Density: Exciton Contribution; 7.4 Lennard-Jones-Like Potential as an Effective Model; 7.5 Chronological Signature of Interactions in Time-Resolved Spectra; 7.6 Summary; 7.7 Supplementary.

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