Nonlinear optical and photoemission spectroscopies of quantum materials
Name
1079760098-MIT.pdf
Description
Full printable version
Size
38.7 MB
Format
Adobe PDF
Checksum (MD5)
c9a3a80b9286d5d421c888019d63110a
Author(s)
Lee, Changmin, Ph. D. Massachusetts Institute of Technology
Advisor(s)
Nuh Gedik.
Date Issued
2018
Publisher
Massachusetts Institute of Technology
Abstract
Quantum materials are characterized by a macroscopic behavior that does not have a clear classical counterpart. Among the experimental probes capable of exploring the exotic properties of quantum materials, ultrafast laser pulses can offer a perspective that is not readily accessible with other conventional techniques. With extremely short pulses (10~100 fs), the strength of electric field is strong enough to cause nonlinear optical phenomena in which the frequency of response is different from that of the input. In this thesis, we discuss how second harmonic generation (SHG) and time and angle-resolved photoemission spectroscopy (tr-ARPES) based on high harmonic generation can offer a unique pathway toward studying quantum materials in the context of broken symmetries and nonequilibrium electronic structure, respectively. In particular, we measured the hidden magnetism buried at a topological insulator ferromagnet interface with SHG, and developed a tr-ARPES setup with 16 and 30 meV energy resolutions using 11 and tunable 24~33 eV photons, respectively. Such high photon energy laser pulses allow us to map the nonequilibrium band structure of a large number of quantum materials, as the setup is capable of probing a much wider momentum range compared to previous tr-ARPES experiments. The capability of our setup is demonstrated through the nonequilibrium band structure of ZrTe5, the quasiparticle recombination dynamics of Bi2Sr2CaCu2O8+[delta], and the dynamics of photoinduced replica bands in WSe2.
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2018.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 157-176).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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