Spectroscopy of Two-Dimensional Excitons in High Magnetic Fields to 30 Tesla

Excitons are hydrogen-like objects in solids, consisting of an electron and a hole bound together through their mutual Coulomb attraction. They play major roles in determining the optoelectronic properties of semiconductors. Magneto-optical spectroscopy provides valuable information on excitons through observation of diamagnetic shifts and Zeeman splittings, but high magnetic fields are required to observe these effects in two-dimensional semiconductors due to enhanced binding energies compared to bulk systems. We have developed a unique magnetospectroscopy setup to investigate materials in fields up to 30 T. The developed setup allows us to change the sample temperature (between 12 K and 300 K), the field direction (negative or positive), the sample configuration (Faraday or Voigt configurations), and the light source (a pulsed laser or a continuous-wave source). We first demonstrated diamagnetic shifts, Landau quantization, and superfluorescence in an InGaAs quantum well sample. Furthermore, we studied two-dimensional hybrid organic-inorganic halide perovskites, which attract much recent attention due to their promising properties for optoelectronic devices such as solar cells and light-emitting devices. We investigated their magnetooptical properties, observing unique temperature-dependent diamagnetic shifts.

Name thesis:degree_name

Doctor of Philosophy

Level thesis:degree_level

Doctoral

Discipline thesis:degree_discipline

Engineering

Grantor

Rice University

Year dc:date.issued

2020

Author dc:creator

• Katsutani, Fumiya

Advisor dc:contributor.advisor

• Kono, Junichiro

• Spectroscopy
• 2D material
• High Magnetic Field
• NIR
• Visible
• Optoelectronic devices
• Exciton
• Hybrid organic-inorganic halide perovskites

Statement dc:rights

• Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1911/109210

OAI identifier oai:identifier

oai:repository.rice.edu:1911/109210