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Quantum Transport in Twisted Bilayer...

Tian, Haidong,

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Quantum Transport in Twisted Bilayer Graphene /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Quantum Transport in Twisted Bilayer Graphene // Haidong Tian.
Author:	Tian, Haidong,
Description:	1 electronic resource (129 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
Contained By:	Dissertations Abstracts International86-06B.
Subject:	Physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31837299
ISBN:	9798346854180

Quantum Transport in Twisted Bilayer Graphene /
Tian, Haidong,

Quantum Transport in Twisted Bilayer Graphene /Haidong Tian. - 1 electronic resource (129 pages)

Source: Dissertations Abstracts International, Volume: 86-06, Section: B.

The intriguing correlated phenomena that emerge in the flat band of the twisted bilayer graphene manifest in a phase diagram where the superconducting dome is adjacent to a correlated insulating state and the metallic phase above the superconducting dome is arguably a strange metal. In this dissertation, the superconducting and correlated insulating states are reexamined using low temperature transport studies. First, the extremely slow group velocity associated with the flat band renders the very existence of superconductivity paradoxical. This paradox is resolved by the dominant quantum geometric contribution to the superfluid stiffness, which is extracted by our non-linear transport data in the superconducting and normal states; we also find that the Schwinger mechanism-limited band velocity constitutes a new limiting mechanism to the superconducting critical current. Second, the balance among various interactions in large-angle twisted bilayer graphene constrains the spatial ordering of Wannier orbitals. We observe that the competing geometrically frustrated ground states underly a new class of correlated insulating states at denominator 3 fractional moire fillings, which display magnetic ordering signatures and tripled unit cell reconstruction. These results demonstrate twisted bilayer graphene as an exceptional system to explore novel correlated phenomena emergent in flat bands.

English

ISBN: 9798346854180Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Wannier orbitals

Quantum Transport in Twisted Bilayer Graphene /
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500 $a Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
500 $a Advisors: Lau, Chun Ning Jeanie Committee members: Lu, Yuan-Ming; Hirata, Christopher M.; Bockrath, Marc W.
502 $b Ph.D. $c The Ohio State University $d 2024.
520 $a The intriguing correlated phenomena that emerge in the flat band of the twisted bilayer graphene manifest in a phase diagram where the superconducting dome is adjacent to a correlated insulating state and the metallic phase above the superconducting dome is arguably a strange metal. In this dissertation, the superconducting and correlated insulating states are reexamined using low temperature transport studies. First, the extremely slow group velocity associated with the flat band renders the very existence of superconductivity paradoxical. This paradox is resolved by the dominant quantum geometric contribution to the superfluid stiffness, which is extracted by our non-linear transport data in the superconducting and normal states; we also find that the Schwinger mechanism-limited band velocity constitutes a new limiting mechanism to the superconducting critical current. Second, the balance among various interactions in large-angle twisted bilayer graphene constrains the spatial ordering of Wannier orbitals. We observe that the competing geometrically frustrated ground states underly a new class of correlated insulating states at denominator 3 fractional moire fillings, which display magnetic ordering signatures and tripled unit cell reconstruction. These results demonstrate twisted bilayer graphene as an exceptional system to explore novel correlated phenomena emergent in flat bands.
546 $a English
590 $a School code: 0168
650 4 $a Physics. $3 516296
650 4 $a Electromagnetics. $3 3173223
653 $a Wannier orbitals
653 $a Bilayer graphene
690 $a 0605
690 $a 0607
710 2 $a The Ohio State University. $b Physics. $e degree granting institution. $3 3822733
720 1 $a Lau, Chun Ning Jeanie $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-06B.
790 $a 0168
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31837299