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Quantum hall ferromagnets.

Kumar, Akshay.

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Quantum hall ferromagnets.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Quantum hall ferromagnets./
Author:	Kumar, Akshay.
Description:	125 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.
Contained By:	Dissertation Abstracts International77-08B(E).
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10090238
ISBN:	9781339595665

Quantum hall ferromagnets.
Kumar, Akshay.

Quantum hall ferromagnets. - 125 p.

Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.

Thesis (Ph.D.)--Princeton University, 2016.

We study several quantum phases that are related to the quantum Hall effect. Our initial focus is on a pair of quantum Hall ferromagnets where the quantum Hall ordering occurs simultaneously with a spontaneous breaking of an internal symmetry associated with a semiconductor valley index. In our first example ---AlAs heterostructures--- we study domain wall structure, role of random-field disorder and dipole moment physics.

ISBN: 9781339595665Subjects--Topical Terms:

3173567
Condensed matter physics.

Quantum hall ferromagnets.
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020 $a 9781339595665
035 $a (MiAaPQ)AAI10090238
035 $a AAI10090238
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100 1 $a Kumar, Akshay. $3 3192705
245 1 0 $a Quantum hall ferromagnets.
300 $a 125 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-08(E), Section: B.
500 $a Adviser: Shivaji Sondhi.
502 $a Thesis (Ph.D.)--Princeton University, 2016.
520 $a We study several quantum phases that are related to the quantum Hall effect. Our initial focus is on a pair of quantum Hall ferromagnets where the quantum Hall ordering occurs simultaneously with a spontaneous breaking of an internal symmetry associated with a semiconductor valley index. In our first example ---AlAs heterostructures--- we study domain wall structure, role of random-field disorder and dipole moment physics.
520 $a Then in the second example ---Si(111)--- we show that symmetry breaking near several integer filling fractions involves a combination of selection by thermal fluctuations known as "order by disorder" and a selection by the energetics of Skyrme lattices induced by moving away from the commensurate fillings, a mechanism we term "order by doping". We also study ground state of such systems near filling factor one in the absence of valley Zeeman energy. We show that even though the lowest energy charged excitations are charge one skyrmions, the lowest energy skyrmion lattice has charge > 1 per unit cell.
520 $a We then broaden our discussion to include lattice systems having multiple Chern number bands. We find analogs of quantum Hall ferromagnets in the menagerie of fractional Chern insulator phases. Unlike in the AlAs system, here the domain walls come naturally with gapped electronic excitations.
520 $a We close with a result involving only topology: we show that ABC stacked multilayer graphene placed on boron nitride substrate has flat bands with non-zero local Berry curvature but zero Chern number. This allows access to an interaction dominated system with a non-trivial quantum distance metric but without the extra complication of a non-zero Chern number.
590 $a School code: 0181.
650 4 $a Condensed matter physics. $3 3173567
690 $a 0611
710 2 $a Princeton University. $b Physics. $3 2101570
773 0 $t Dissertation Abstracts International $g 77-08B(E).
790 $a 0181
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10090238