東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Magneto-Optical Studies of Mn Doped ...

Zhang, Peiyao.

FindBook

Google Book

Amazon

博客來

Magneto-Optical Studies of Mn Doped II-VI Group Semiconductor Nanostructures.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Magneto-Optical Studies of Mn Doped II-VI Group Semiconductor Nanostructures./
作者:	Zhang, Peiyao.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	109 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
Contained By:	Dissertations Abstracts International80-09B.
標題:	Condensed matter physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13427345
ISBN:	9780438945302

Magneto-Optical Studies of Mn Doped II-VI Group Semiconductor Nanostructures.
Zhang, Peiyao.

Magneto-Optical Studies of Mn Doped II-VI Group Semiconductor Nanostructures. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 109 p.

Source: Dissertations Abstracts International, Volume: 80-09, Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2019.

This item must not be added to any third party search indexes.

This dissertation is a magneto-optical study of two types of semiconductor nanostructures: 1) diluted magnetic semiconductor (DMS) quantum well (QW) and quantum dot (QD) structures and 2) thin layer transition metal dichalcogenide (TMD)/antiferromagnetic substrate van der Waals heterostructure. In both systems, by introducing magnetic ion into the system or using magnetic substrates, the magnetic properties of the systems are greatly modified, i.e., the sp-d exchange interaction between the spins of carriers and those of the magnetic ions in DMS nanostructures and the Zeeman splitting in TMD/AFM heterostructures. The structures under study allow for versatile control of quantum confinement and spin degree of freedom of carriers which make them interesting for fundamental physics studies as well as spintronics and other optoelectronics practical applications. We have used various optical experimental techniques, including continuous-wave and time-resolved magneto-photoluminescence and transmission spectroscopies to study the properties of two DMS nanostructures: 1) CdSe/CdMnS core/multi-shell nanoplatelets (NPLs) and 2) ZnTe quantum dots (QDs) embedded in (Zn,Mn)Se matrices. In CdSe/CdMnS NPL system, the sp-d exchange interaction between carrier spins and spins of the Mn2+ ions can be tailored by changing the position of the magnetic ion or the thickness of the magnetic shell layer. By increasing the carrier-Mn wavefunction overlap through wavefunction engineer, the magnetic properties are enhanced, and result in larger photoluminescence circular polarization and Zeeman splittings. The asymmetry in the emission lineshape suggests multiple recombination channels; these are further explored using time-resolved spectroscopy, from which recombination lifetimes were determined. In ZnTe/(Zn,Mn)Se QD system, by using different excitation photon energy, we have realized the control of the number of holes confined in the ZnTe QDs, the wavefunction overlap between the holes in the QD and the magnetic ions in (Zn,Mn)Se matrix and the photoluminescence peak energy red shift. The experimental observations are modelled theoretically with inclusion of the hole-hole Coulomb interaction as well as the hole-Mn exchange interaction. Magneto-reflectance spectroscopy was used to explore the magneto-optical properties of thin layer WS2/FePS3 heterostructures. Thin layer TMD has a bandgap in the visible region with unique spin-valley-layer locking properties: spin-up (down) transition only couples with σ + (σ−) circularly polarized photons. With the application of an external magnetic field, the broken time-reversal symmetry between spin-up and spin-down states can be detected by studying reflectance spectra with different incident circular polarization. In monolayer WS 2/FePS3, the Zeeman splitting resembles the intrinsic WS 2 Zeeman behavior, due to the zero net magnetization of the AFM substrate. In constrast, bi- and tri-layer WS2/FePS3 samples exhibit enhanced Zeeman splitting with a saturation trend, indicating emergent ferromagnetism at the WS2/FePS3 interface. A temperature study reveals the coincidence of the Curie temperature of the emergent ferromagnetism and the N'eel temperature of the antiferrmagnetic FePS3 substrate, confirming that the observed interfacial ferromagnetism originates from the FePS3 substrates.

ISBN: 9780438945302Subjects--Topical Terms:

3173567
Condensed matter physics.

Magneto-Optical Studies of Mn Doped II-VI Group Semiconductor Nanostructures.
LDR:04506nmm a2200325 4500 001 2205814
005 20190828135959.5
008 201008s2019 ||||||||||||||||| ||eng d
020 $a 9780438945302
035 $a (MiAaPQ)AAI13427345
035 $a (MiAaPQ)buffalo:16244
035 $a AAI13427345
040 $a MiAaPQ $c MiAaPQ
100 1 $a Zhang, Peiyao. $3 3432688
245 1 0 $a Magneto-Optical Studies of Mn Doped II-VI Group Semiconductor Nanostructures.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 109 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Petrou, Athos.
502 $a Thesis (Ph.D.)--State University of New York at Buffalo, 2019.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a This dissertation is a magneto-optical study of two types of semiconductor nanostructures: 1) diluted magnetic semiconductor (DMS) quantum well (QW) and quantum dot (QD) structures and 2) thin layer transition metal dichalcogenide (TMD)/antiferromagnetic substrate van der Waals heterostructure. In both systems, by introducing magnetic ion into the system or using magnetic substrates, the magnetic properties of the systems are greatly modified, i.e., the sp-d exchange interaction between the spins of carriers and those of the magnetic ions in DMS nanostructures and the Zeeman splitting in TMD/AFM heterostructures. The structures under study allow for versatile control of quantum confinement and spin degree of freedom of carriers which make them interesting for fundamental physics studies as well as spintronics and other optoelectronics practical applications. We have used various optical experimental techniques, including continuous-wave and time-resolved magneto-photoluminescence and transmission spectroscopies to study the properties of two DMS nanostructures: 1) CdSe/CdMnS core/multi-shell nanoplatelets (NPLs) and 2) ZnTe quantum dots (QDs) embedded in (Zn,Mn)Se matrices. In CdSe/CdMnS NPL system, the sp-d exchange interaction between carrier spins and spins of the Mn2+ ions can be tailored by changing the position of the magnetic ion or the thickness of the magnetic shell layer. By increasing the carrier-Mn wavefunction overlap through wavefunction engineer, the magnetic properties are enhanced, and result in larger photoluminescence circular polarization and Zeeman splittings. The asymmetry in the emission lineshape suggests multiple recombination channels; these are further explored using time-resolved spectroscopy, from which recombination lifetimes were determined. In ZnTe/(Zn,Mn)Se QD system, by using different excitation photon energy, we have realized the control of the number of holes confined in the ZnTe QDs, the wavefunction overlap between the holes in the QD and the magnetic ions in (Zn,Mn)Se matrix and the photoluminescence peak energy red shift. The experimental observations are modelled theoretically with inclusion of the hole-hole Coulomb interaction as well as the hole-Mn exchange interaction. Magneto-reflectance spectroscopy was used to explore the magneto-optical properties of thin layer WS2/FePS3 heterostructures. Thin layer TMD has a bandgap in the visible region with unique spin-valley-layer locking properties: spin-up (down) transition only couples with σ + (σ−) circularly polarized photons. With the application of an external magnetic field, the broken time-reversal symmetry between spin-up and spin-down states can be detected by studying reflectance spectra with different incident circular polarization. In monolayer WS 2/FePS3, the Zeeman splitting resembles the intrinsic WS 2 Zeeman behavior, due to the zero net magnetization of the AFM substrate. In constrast, bi- and tri-layer WS2/FePS3 samples exhibit enhanced Zeeman splitting with a saturation trend, indicating emergent ferromagnetism at the WS2/FePS3 interface. A temperature study reveals the coincidence of the Curie temperature of the emergent ferromagnetism and the N'eel temperature of the antiferrmagnetic FePS3 substrate, confirming that the observed interfacial ferromagnetism originates from the FePS3 substrates.
590 $a School code: 0656.
650 4 $a Condensed matter physics. $3 3173567
690 $a 0611
710 2 $a State University of New York at Buffalo. $b Physics. $3 1025831
773 0 $t Dissertations Abstracts International $g 80-09B.
790 $a 0656
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13427345