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Spin and valley ferromagnetism of in...

Vakili, Kamran.

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Spin and valley ferromagnetism of interacting, two-dimensional electrons in AlAs quantum wells.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Spin and valley ferromagnetism of interacting, two-dimensional electrons in AlAs quantum wells./
作者:	Vakili, Kamran.
面頁冊數:	163 p.
附註:	Source: Dissertation Abstracts International, Volume: 68-01, Section: B, page: 0351.
Contained By:	Dissertation Abstracts International68-01B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3250040

Spin and valley ferromagnetism of interacting, two-dimensional electrons in AlAs quantum wells.
Vakili, Kamran.

Spin and valley ferromagnetism of interacting, two-dimensional electrons in AlAs quantum wells. - 163 p.

Source: Dissertation Abstracts International, Volume: 68-01, Section: B, page: 0351.

Thesis (Ph.D.)--Princeton University, 2007.

This thesis explores manifestations of spin and pseudospin ferromagnetism in interacting two-dimensional electron systems (2DESs) confined to AlAs quantum wells (QWs). Our study has been motivated by the ideality of the AlAs system for the exploration of paramagnetic and ferromagnetic phases related to discrete degrees of freedom, including spin, valley, and layer.Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Spin and valley ferromagnetism of interacting, two-dimensional electrons in AlAs quantum wells.
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100 1 $a Vakili, Kamran. $3 1923248
245 1 0 $a Spin and valley ferromagnetism of interacting, two-dimensional electrons in AlAs quantum wells.
300 $a 163 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-01, Section: B, page: 0351.
500 $a Adviser: Mansour Shayegan.
502 $a Thesis (Ph.D.)--Princeton University, 2007.
520 $a This thesis explores manifestations of spin and pseudospin ferromagnetism in interacting two-dimensional electron systems (2DESs) confined to AlAs quantum wells (QWs). Our study has been motivated by the ideality of the AlAs system for the exploration of paramagnetic and ferromagnetic phases related to discrete degrees of freedom, including spin, valley, and layer.
520 $a Bulk AlAs has an indirect band gap with three degenerate conduction band minima located at the X points of the Brillouin zone. These anisotropic minima, or valleys, are prolate ellipsoids with a longitudinal band mass of 1.1 and transverse band masses of 0.21, expressed in units of the vacuum electron mass. Confinement of the electrons along one crystal axis breaks the degeneracy between the three valleys, because the confinement mass of the valley oriented out of the plane is largest and, hence, the confinement energy is lowest. On the other hand, there is compressive in-plane strain on the AlAs layer caused by the slight lattice mismatch between AlAs and the GaAs substrate on which it is grown that lowers the energy of the in-plane valleys. The competition between these two effects produces a crossover of valley occupation at a well width of &sime;50 A.
520 $a We have studied AlAs QWs at or below the threshold width in samples with an order-of-magnitude higher mobility than in previous studies. Owing to the improved quality and the unique properties of very narrow AlAs QWs, we have been able to make accurate measurements of the interaction enhanced spin-susceptibility of a 2DES in the paramagnetic phase over a wide density range that includes the so-called zero-field metal-to-insulator transition and have. Additionally, we have uncovered a new and apparently universal behavior in the quantum Hall properties of two-dimensional electrons whereby the amplitude of resistivity peaks is modulated depending on the spin of the Landau level in which the Fermi energy resides. This spin-dependent resistivity, in turn, leads to a new explanation for resistivity spikes that occur at first-order ferromagnetic phase transitions near crossings between different spin Landau levels. Finally, we investigated the effects of interaction between electrons occupying different conduction band valleys in the quantum Hall regime. We discuss two-mass 2DESs, with one in-plane and one out-of-plane valley occupied, and the interplay of spin and valley degrees of freedom in a 2DES with two in-plane valleys occupied.
590 $a School code: 0181.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Electricity and Magnetism. $3 1019535
650 4 $a Physics, Condensed Matter. $3 1018743
690 $a 0544
690 $a 0607
690 $a 0611
710 2 0 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 68-01B.
790 1 0 $a Shayegan, Mansour, $e advisor
790 $a 0181
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3250040