東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Theory of Intrinsic Spin-Dependent T...

Song, Yang.

Linked to FindBook

Google Book

Amazon

博客來

Theory of Intrinsic Spin-Dependent Transport in Semiconductors and Two-Dimensional Membranes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Theory of Intrinsic Spin-Dependent Transport in Semiconductors and Two-Dimensional Membranes./
Author:	Song, Yang.
Description:	242 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
Contained By:	Dissertation Abstracts International75-02B(E).
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3600466
ISBN:	9781303505713

Theory of Intrinsic Spin-Dependent Transport in Semiconductors and Two-Dimensional Membranes.
Song, Yang.

Theory of Intrinsic Spin-Dependent Transport in Semiconductors and Two-Dimensional Membranes. - 242 p.

Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.

Thesis (Ph.D.)--University of Rochester, 2013.

A reliable theoretical framework is developed for spin-dependent transport in the presence of electron-phonon interactions. The centerpiece of the theory explores the symmetry of the studied systems and processes. In addition, microscopic kinetic processes are incorporated. Rigorous numerical methods are employed in order to verify our predictions. Applying the theory to potential key semiconductors for spintronics, such as silicon and germanium, and to the nascent material family of two-dimensional membranes, one obtains physical clarity as well as explicit analytical results. Following the construction of electronic and phonon states, we derive spin-dependent electron-phonon scattering matrix elements for all processes induced by acoustic or optical phonons (including transparent derivations of important two-phonon processes in two-dimensional membranes), intravalley or intervalley scattering for multivalley conduction bands, and interband scattering for the gapless graphene. The resulting expressions are explicit functions of electron wavevectors, spin orientation, phonon modes and valley positions. Using the acquired insights, remarkable physical consequences are discovered. These include optimal spin transport in Si by combining strain and geometrical constrains, extremely long room-temperature spin lifetime in strained Ge when the spin is oriented parallel to a [111] strain (&sim;1mus), and ultrafast electron spin relaxation in single-layer transition-metal dichalcogenides. By the unique properties of two-dimensional membranes inherited from their mirror symmetry and out-of-plane softness, we notice decoupling between spin and momentum transport due to scattering with out-of-plane acoustic phonons (the most populous branch). By symmetry analysis of orbital configurations, contrasting spin splitting and spin flip constants are predicted for the conduction bands of various single-layer transition-metal dichalcogenides. In addition to transport phenomena, we also apply the theory to optical excitation of hot excitons. Incorporating microscopic spin-flip results into Boltzmann transport equations, one can explore spin communication applications. Apart from spin relaxation, spin injection and detection are also key phases. We study tunnel-barrier profiles that are complicated by doping inhomogeneity, and quantify the limitations on the applied bias due to detrimental spin relaxation of hot electrons in zinc-blende semiconductors. Importantly, we elaborate dynamic signals of high-frequency devices, and noncollinear magnetization configurations of the electrodes to discuss optimal information density.

ISBN: 9781303505713Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Theory of Intrinsic Spin-Dependent Transport in Semiconductors and Two-Dimensional Membranes.
LDR:03559nmm a2200289 4500 001 2055549
005 20150121082836.5
008 170521s2013 eng d
020 $a 9781303505713
035 $a (MiAaPQ)AAI3600466
035 $a AAI3600466
040 $a MiAaPQ $c MiAaPQ
100 1 $a Song, Yang. $3 1265217
245 1 0 $a Theory of Intrinsic Spin-Dependent Transport in Semiconductors and Two-Dimensional Membranes.
300 $a 242 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
500 $a Adviser: Hanan Dery.
502 $a Thesis (Ph.D.)--University of Rochester, 2013.
520 $a A reliable theoretical framework is developed for spin-dependent transport in the presence of electron-phonon interactions. The centerpiece of the theory explores the symmetry of the studied systems and processes. In addition, microscopic kinetic processes are incorporated. Rigorous numerical methods are employed in order to verify our predictions. Applying the theory to potential key semiconductors for spintronics, such as silicon and germanium, and to the nascent material family of two-dimensional membranes, one obtains physical clarity as well as explicit analytical results. Following the construction of electronic and phonon states, we derive spin-dependent electron-phonon scattering matrix elements for all processes induced by acoustic or optical phonons (including transparent derivations of important two-phonon processes in two-dimensional membranes), intravalley or intervalley scattering for multivalley conduction bands, and interband scattering for the gapless graphene. The resulting expressions are explicit functions of electron wavevectors, spin orientation, phonon modes and valley positions. Using the acquired insights, remarkable physical consequences are discovered. These include optimal spin transport in Si by combining strain and geometrical constrains, extremely long room-temperature spin lifetime in strained Ge when the spin is oriented parallel to a [111] strain (&sim;1mus), and ultrafast electron spin relaxation in single-layer transition-metal dichalcogenides. By the unique properties of two-dimensional membranes inherited from their mirror symmetry and out-of-plane softness, we notice decoupling between spin and momentum transport due to scattering with out-of-plane acoustic phonons (the most populous branch). By symmetry analysis of orbital configurations, contrasting spin splitting and spin flip constants are predicted for the conduction bands of various single-layer transition-metal dichalcogenides. In addition to transport phenomena, we also apply the theory to optical excitation of hot excitons. Incorporating microscopic spin-flip results into Boltzmann transport equations, one can explore spin communication applications. Apart from spin relaxation, spin injection and detection are also key phases. We study tunnel-barrier profiles that are complicated by doping inhomogeneity, and quantify the limitations on the applied bias due to detrimental spin relaxation of hot electrons in zinc-blende semiconductors. Importantly, we elaborate dynamic signals of high-frequency devices, and noncollinear magnetization configurations of the electrodes to discuss optimal information density.
590 $a School code: 0188.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Nanotechnology. $3 526235
690 $a 0611
690 $a 0794
690 $a 0652
710 2 0 $a University of Rochester. $b School of Arts and Sciences. $3 2099014
773 0 $t Dissertation Abstracts International $g 75-02B(E).
790 $a 0188
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3600466