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Spin in the quantum Hall effect :OPNMR studies of skyrmions and composite fermions

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spin in the quantum Hall effect :
Reminder of title:	OPNMR studies of skyrmions and composite fermions
Author:	Dementyev, Anatoly E.
Description:	133 p.
Notes:	Director: Sean E. Barrett.
Notes:	Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1372.
Contained By:	Dissertation Abstracts International65-03B.
Subject:	Physics, Condensed Matter.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3125181
ISBN:	0496724711

Spin in the quantum Hall effect :OPNMR studies of skyrmions and composite fermions
Dementyev, Anatoly E.

Spin in the quantum Hall effect :OPNMR studies of skyrmions and composite fermions [electronic resource] - 133 p.

Director: Sean E. Barrett.

Thesis (Ph.D.)--Yale University, 2004.

As we lower the temperature down to T ≈ 0.3 K, a "tilted plateau" emerges in the Knight shift data near the integer quantum Hall ground state nu = 1. This "tilted plateau" is a novel experimental signature of quasiparticle localization. The dependence of the spectra on both T and nu suggests that the localization is a collective process. The frozen limit spectra appear to rule out a 2D lattice of conventional Skyrmions.

ISBN: 0496724711Subjects--Topical Terms:

226939
Physics, Condensed Matter.

Spin in the quantum Hall effect :OPNMR studies of skyrmions and composite fermions
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245 1 0 $a Spin in the quantum Hall effect : $b OPNMR studies of skyrmions and composite fermions $h [electronic resource]
300 $a 133 p.
500 $a Director: Sean E. Barrett.
500 $a Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1372.
502 $a Thesis (Ph.D.)--Yale University, 2004.
520 # $a As we lower the temperature down to T ≈ 0.3 K, a "tilted plateau" emerges in the Knight shift data near the integer quantum Hall ground state nu = 1. This "tilted plateau" is a novel experimental signature of quasiparticle localization. The dependence of the spectra on both T and nu suggests that the localization is a collective process. The frozen limit spectra appear to rule out a 2D lattice of conventional Skyrmions.
520 # $a In this thesis we report optically pumped nuclear magnetic resonance (OPNMR) measurements of the 71Ga spectra and the nuclear spin-lattice relaxation rate 1/T1, carried out in n-doped GaAs/Al 0.1Ga0.9As multiple quantum well (MQW) samples.
520 # $a Our OPNMR measurements of the Knight shift and the nuclear spin-lattice relaxation rate 1/T1 at Landau level filling factor nu = 1/2 provide new constraints on the theoretical description of the nu = 1/2 state. We compare the data with predictions of a weakly-interacting composite fermion model and the extended Hamiltonian theory.
520 # $a The last chapter has a different focus: unexpected NMR phenomena observed in a dilute dipolar solid. We report 29Si NMR measurements of Carr-Purcell-MeiboomGill (CPMG) spin echoes obtained in doped silicon powders. The CPMG echoes have several unusual differences from ordinary Hahn echoes, including even-odd echo asymmetry, effects evoking spin-locking and stimulated echoes, and longer "coherence" times. The surprising phenomena appear to be consequences of the homonuclear dipolar coupling, and are therefore relevant to physical implementations of quantum computation.
590 $a School code: 0265.
650 # 0 $a Physics, Condensed Matter. $3 226939
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710 0 # $a Yale University. $3 212430
773 0 # $g 65-03B. $t Dissertation Abstracts International
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