東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Low Temperature Electrical Transport...

Krantz, Patrick W.

FindBook

Google Book

Amazon

博客來

Low Temperature Electrical Transport Behavior of AlOx/KTaO3 Based Two Dimensional Electron Gases.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Low Temperature Electrical Transport Behavior of AlOx/KTaO3 Based Two Dimensional Electron Gases./
作者:	Krantz, Patrick W.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	201 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
Contained By:	Dissertations Abstracts International85-02B.
標題:	Condensed matter physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30573405
ISBN:	9798380148085

Low Temperature Electrical Transport Behavior of AlOx/KTaO3 Based Two Dimensional Electron Gases.
Krantz, Patrick W.

Low Temperature Electrical Transport Behavior of AlOx/KTaO3 Based Two Dimensional Electron Gases. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 201 p.

Source: Dissertations Abstracts International, Volume: 85-02, Section: B.

Thesis (Ph.D.)--Northwestern University, 2023.

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

Necessity is the mother of innovation. In the wake of the pandemic, with no flow of samples and limited fabrication techniques available, necessity demanded a new material platform and adaptable methods to make complex oxide samples worth measuring. The material platform was KTaO3, the younger successor to the mainstay of complex oxide work, SrTiO3, and the method was in-house aluminum evaporation that generated a conducting gas on the surface of the unassuming crystal squares. The result of this innovation was the conducting gas at the interface of the AlOx / KTaO3 heterostructure, fabricated into Hall bars to measure conducting properties and search for novel physics. KTaO3 has previously been shown to host a number of interesting properties, including large spin orbit interactions due to the conducting 5d orbitals on the Ta atoms, superconductivity on the (110) and (111) crystal terminated faces up to 2 K, and a readily tunable set of conducting properties with an applied back gate voltage. These properties were confirmed in two sets of conducting samples fabricated as described, and showed improvement in both carrier concentration and carrier mobility compared to similar works in the literature. The samples also showed a series of novel results, in particular the emergence of macroscopic magnetism evident in hysteretic peaks observed in magnetotransport measurements. The second set of samples were fabricated in such a way to induce superconductivity, and those samples showed peaks in carrier concentration as a function of applied gate voltage, indicated the presence of a Lifshitz transition in the nature of the conduction. This unexpected carrier dependence on gate voltage was reflected in the superconducting properties, which showed other novelties including an upper gate limit to the superconductivity, a coexistence of the superconductivity with the macroscopic magnetism, and non-trivial relationship between carrier concentration and Tc, which is a strict departure from the literature. An analysis of the superconducting state followed, showing other peculiarities, and the work extends to measurements of the quantum nonlinear Hall effect which do not agree with theory for most of the samples investigated. In total, this work forms a broad basis for research on the novel transport properties of the AlO3 / KTO interface, and suggests several experiments to dive deeper into unexplained results encountered along the way.

ISBN: 9798380148085Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Complex oxide

Low Temperature Electrical Transport Behavior of AlOx/KTaO3 Based Two Dimensional Electron Gases.
LDR:03725nmm a2200409 4500 001 2396738
005 20240611104929.5
006 m o d
007 cr#unu||||||||
008 251215s2023 ||||||||||||||||| ||eng d
020 $a 9798380148085
035 $a (MiAaPQ)AAI30573405
035 $a AAI30573405
040 $a MiAaPQ $c MiAaPQ
100 1 $a Krantz, Patrick W. $0 (orcid)0000-0003-4179-2131 $3 3766480
245 1 0 $a Low Temperature Electrical Transport Behavior of AlOx/KTaO3 Based Two Dimensional Electron Gases.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 201 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
500 $a Advisor: Chandrasekhar, Venkat.
502 $a Thesis (Ph.D.)--Northwestern University, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a Necessity is the mother of innovation. In the wake of the pandemic, with no flow of samples and limited fabrication techniques available, necessity demanded a new material platform and adaptable methods to make complex oxide samples worth measuring. The material platform was KTaO3, the younger successor to the mainstay of complex oxide work, SrTiO3, and the method was in-house aluminum evaporation that generated a conducting gas on the surface of the unassuming crystal squares. The result of this innovation was the conducting gas at the interface of the AlOx / KTaO3 heterostructure, fabricated into Hall bars to measure conducting properties and search for novel physics. KTaO3 has previously been shown to host a number of interesting properties, including large spin orbit interactions due to the conducting 5d orbitals on the Ta atoms, superconductivity on the (110) and (111) crystal terminated faces up to 2 K, and a readily tunable set of conducting properties with an applied back gate voltage. These properties were confirmed in two sets of conducting samples fabricated as described, and showed improvement in both carrier concentration and carrier mobility compared to similar works in the literature. The samples also showed a series of novel results, in particular the emergence of macroscopic magnetism evident in hysteretic peaks observed in magnetotransport measurements. The second set of samples were fabricated in such a way to induce superconductivity, and those samples showed peaks in carrier concentration as a function of applied gate voltage, indicated the presence of a Lifshitz transition in the nature of the conduction. This unexpected carrier dependence on gate voltage was reflected in the superconducting properties, which showed other novelties including an upper gate limit to the superconductivity, a coexistence of the superconductivity with the macroscopic magnetism, and non-trivial relationship between carrier concentration and Tc, which is a strict departure from the literature. An analysis of the superconducting state followed, showing other peculiarities, and the work extends to measurements of the quantum nonlinear Hall effect which do not agree with theory for most of the samples investigated. In total, this work forms a broad basis for research on the novel transport properties of the AlO3 / KTO interface, and suggests several experiments to dive deeper into unexplained results encountered along the way.
590 $a School code: 0163.
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Physics. $3 516296
650 4 $a Low temperature physics. $3 3173917
653 $a Complex oxide
653 $a Cryogenic
653 $a Electrical transport
653 $a KTaO3
653 $a Magnetism
653 $a Superconductivity
690 $a 0611
690 $a 0598
690 $a 0605
710 2 $a Northwestern University. $b Physics. $3 3766481
773 0 $t Dissertations Abstracts International $g 85-02B.
790 $a 0163
791 $a Ph.D.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30573405