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Scanning tunneling spectroscopy of t...

Yee, Michael Manchun.

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Scanning tunneling spectroscopy of topological insulators and cuprate superconductors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Scanning tunneling spectroscopy of topological insulators and cuprate superconductors./
Author:	Yee, Michael Manchun.
Description:	145 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
Contained By:	Dissertation Abstracts International75-10B(E).
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3627314
ISBN:	9781321024753

Scanning tunneling spectroscopy of topological insulators and cuprate superconductors.
Yee, Michael Manchun.

Scanning tunneling spectroscopy of topological insulators and cuprate superconductors. - 145 p.

Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.

Thesis (Ph.D.)--Harvard University, 2014.

This item is not available from ProQuest Dissertations & Theses.

Over the past twenty-five years, condensed matter physics has been developing materials with novel electronic characteristics for a wide range of future applications. Two research directions have shown particular promise: topological insulators, and high temperature copper based superconductors (cuprates). Topological insulators are a newly discovered class of materials that can be manipulated for spintronic or quantum computing devices. However there is a poor spectroscopic understanding of the current topological insulators and emerging topological insulator candidates. In cuprate superconductors, the challenge lies in raising the superconducting transition temperature to temperatures accessible in non-laboratory settings. This effort has been hampered by a poor understanding of the superconducting mechanism and its relationship with a mysterious pseudogap phase. In this thesis, I will describe experiments conducted on topological insulators and cuprate superconductors using scanning tunneling microscopy and spectroscopy, which provide nanoscale spectroscopic information in these materials.

ISBN: 9781321024753Subjects--Topical Terms:

3173567
Condensed matter physics.

Scanning tunneling spectroscopy of topological insulators and cuprate superconductors.
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020 $a 9781321024753
035 $a (MiAaPQ)AAI3627314
035 $a AAI3627314
040 $a MiAaPQ $c MiAaPQ
100 1 $a Yee, Michael Manchun. $3 3192846
245 1 0 $a Scanning tunneling spectroscopy of topological insulators and cuprate superconductors.
300 $a 145 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
500 $a Adviser: Jennifer Hoffman.
502 $a Thesis (Ph.D.)--Harvard University, 2014.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Over the past twenty-five years, condensed matter physics has been developing materials with novel electronic characteristics for a wide range of future applications. Two research directions have shown particular promise: topological insulators, and high temperature copper based superconductors (cuprates). Topological insulators are a newly discovered class of materials that can be manipulated for spintronic or quantum computing devices. However there is a poor spectroscopic understanding of the current topological insulators and emerging topological insulator candidates. In cuprate superconductors, the challenge lies in raising the superconducting transition temperature to temperatures accessible in non-laboratory settings. This effort has been hampered by a poor understanding of the superconducting mechanism and its relationship with a mysterious pseudogap phase. In this thesis, I will describe experiments conducted on topological insulators and cuprate superconductors using scanning tunneling microscopy and spectroscopy, which provide nanoscale spectroscopic information in these materials.
520 $a First, I will describe experiments on the purported topological Kondo insulator SmB6, where a topological surface state is expected to emerge from a strongly correlated hybridization gap. I used a spectral decomposition technique and temperature dependent spectroscopy to measure and observe the opening of the hybridization gap, and find evidence for a topological surface state. I will then describe experiments performed on the topological insulator Bi2-xFexSe3, where I observed the scattering of surface states to surprisingly high energies. Models using density functional theory show that the interaction of the trivial and topological surface states could provide a route towards future topological insulator devices.
520 $a I then discuss two experiments performed on the Bi-based cuprates. In the first experiment, I imaged a static charge density wave that, in conjunction with bulk-sensitive probes, reconciles observations of surface and bulk charge ordering in the cuprates over the past twenty years. In the second experiment, I validated previous observations of an electronic nematic order in the pseudogap phase using high spatial-resolution spectroscopy. Together, the work on the cuprates provides insight into the nature of the pseudogap phase, which we find to be characterized by broken symmetries and charge ordering.
590 $a School code: 0084.
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Low temperature physics. $3 3173917
650 4 $a Nanoscience. $3 587832
690 $a 0611
690 $a 0598
690 $a 0565
710 2 $a Harvard University. $b Physics. $3 2094825
773 0 $t Dissertation Abstracts International $g 75-10B(E).
790 $a 0084
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3627314