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Magneto Terahertz Response of Topolo...

Cheng, Bing.

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Magneto Terahertz Response of Topological Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Magneto Terahertz Response of Topological Materials./
作者:	Cheng, Bing.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	236 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-09, Section: B.
Contained By:	Dissertations Abstracts International81-09B.
標題:	Condensed matter physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27805536
ISBN:	9781392716670

Magneto Terahertz Response of Topological Materials.
Cheng, Bing.

Magneto Terahertz Response of Topological Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 236 p.

Source: Dissertations Abstracts International, Volume: 81-09, Section: B.

Thesis (Ph.D.)--The Johns Hopkins University, 2019.

This item must not be sold to any third party vendors.

In this thesis, I have used time-domain magneto terahertz spectroscopy to study several topological materials including topological insulator single crystals of Bi0.1Sb0.9Te2S, topological crystalline insulator thin films of Pb0.5Sn0.5Te, Dirac semimetal thin films of Cd3As2, thin films of the magnetic Weyl semimetal candidate Mn3Sn, Luttinger semimetal thin films of Pr2Ir2O7 . I have made many interesting observations. In Bi0.1Sb0.9Te2S, for the first time, I extracted the topological surface state optical conductance in this bulk-insulating topo- logical insulator by optics. In Pb0.5Sn0.5Te, I extracted its optical conductivity in the circular polarization basis and found its bulk states are massive Dirac fermions. In Cd3As2, I directly observed the optical conductivity for the chiral- anomaly related ac transport which is a smoking-gun signature of the chiral anomaly and resolves issues regarding the long debate over the origin of negative longitudinal magneto resistivity in dc transport. In Pr2Ir2O7, I uncovered a large dielectric anomaly that gives evidence that this system is a symmetry- protected quadratic band touching, which makes this compound a potential platform for crossover between topological semimetals and strongly correlated physics. Finally, I included a terahertz spectroscopic study of a large number of superconducting thin films of NbN in the appendix. I presented clear evidence to demonstrate that the in-gap dissipation states observed by optics are not from the Higgs mode. Through comparing with tunneling data, I found these in-gap optical conductivities come from disorder-induced subgap states.

ISBN: 9781392716670Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Magneto terahertz

Magneto Terahertz Response of Topological Materials.
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300 $a 236 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-09, Section: B.
500 $a Advisor: Armitage, Peter.
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506 $a This item must not be sold to any third party vendors.
520 $a In this thesis, I have used time-domain magneto terahertz spectroscopy to study several topological materials including topological insulator single crystals of Bi0.1Sb0.9Te2S, topological crystalline insulator thin films of Pb0.5Sn0.5Te, Dirac semimetal thin films of Cd3As2, thin films of the magnetic Weyl semimetal candidate Mn3Sn, Luttinger semimetal thin films of Pr2Ir2O7 . I have made many interesting observations. In Bi0.1Sb0.9Te2S, for the first time, I extracted the topological surface state optical conductance in this bulk-insulating topo- logical insulator by optics. In Pb0.5Sn0.5Te, I extracted its optical conductivity in the circular polarization basis and found its bulk states are massive Dirac fermions. In Cd3As2, I directly observed the optical conductivity for the chiral- anomaly related ac transport which is a smoking-gun signature of the chiral anomaly and resolves issues regarding the long debate over the origin of negative longitudinal magneto resistivity in dc transport. In Pr2Ir2O7, I uncovered a large dielectric anomaly that gives evidence that this system is a symmetry- protected quadratic band touching, which makes this compound a potential platform for crossover between topological semimetals and strongly correlated physics. Finally, I included a terahertz spectroscopic study of a large number of superconducting thin films of NbN in the appendix. I presented clear evidence to demonstrate that the in-gap dissipation states observed by optics are not from the Higgs mode. Through comparing with tunneling data, I found these in-gap optical conductivities come from disorder-induced subgap states.
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