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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Spin in the quantum Hall effect :
其他題名:	OPNMR studies of skyrmions and composite fermions
作者:	Dementyev, Anatoly E.
面頁冊數:	133 p.
附註:	Director: Sean E. Barrett.
附註:	Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1372.
Contained By:	Dissertation Abstracts International65-03B.
標題:	Physics, Condensed Matter.
電子資源:	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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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.
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