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Effective Models for Optical Propert...

Salazar Gonzalez, Juan Cuauhtemoc.

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Effective Models for Optical Properties: A Study on 1D, 2D, and 3D Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effective Models for Optical Properties: A Study on 1D, 2D, and 3D Materials./
作者:	Salazar Gonzalez, Juan Cuauhtemoc.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	143 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-08(E), Section: B.
Contained By:	Dissertation Abstracts International79-08B(E).
標題:	Physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10742581
ISBN:	9780355803662

Effective Models for Optical Properties: A Study on 1D, 2D, and 3D Materials.
Salazar Gonzalez, Juan Cuauhtemoc.

Effective Models for Optical Properties: A Study on 1D, 2D, and 3D Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 143 p.

Source: Dissertation Abstracts International, Volume: 79-08(E), Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2018.

In this thesis I employ effective Hamiltonian models to study the electronic structure of materials. With these models I study charge- and spin-injection induced by optical absorption processes, and current-injection induced by quantum interference processes between different orders of absorption. I study the optical response of narrow stripes (''nanoribbons'') of monolayer graphene, monolayers of tin atoms (''stanene''), and alloys of AlGaAs.

ISBN: 9780355803662Subjects--Topical Terms:

516296
Physics.

Effective Models for Optical Properties: A Study on 1D, 2D, and 3D Materials.
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500 $a Source: Dissertation Abstracts International, Volume: 79-08(E), Section: B.
500 $a Adviser: John E. Sipe.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2018.
520 $a In this thesis I employ effective Hamiltonian models to study the electronic structure of materials. With these models I study charge- and spin-injection induced by optical absorption processes, and current-injection induced by quantum interference processes between different orders of absorption. I study the optical response of narrow stripes (''nanoribbons'') of monolayer graphene, monolayers of tin atoms (''stanene''), and alloys of AlGaAs.
520 $a First I focus on graphene nanoribbons with zigzag shapes along their lengths, along which strongly localized (''edge'') states exist at the Fermi level of undoped samples. I present results for different chemical potentials, showing that edge states are responsible for the main contribution to the optical response at low photon energies (<1 eV).
520 $a Next, I study stanene, a monolayer of tin atoms arranged in a buckled honeycomb lattice with Dirac-like cones in its bandstructure. The spin-orbit coupling in stanene is significant and leads to a small band gap opening of about 90~meV. I present a scheme to extract an effective Hamiltonian model starting from an ab-initio calculation. I keep track of the quality of the approximations by a careful analysis of the electronic energies and the states obtained with this effective model. Using this model I study the one- and two-photon absorption, and spin-injection by circularly polarized light.
520 $a Finally, I investigate the optical coherent control of charge currents by two- and three-photon absorption (''2+3'') processes in alloys of Al alphaGa1--alphaAs. An important feature of this material is that its electronic bandstructure can be tailored to photon energies of interest. Compared to lower orders of interference, such as the 1+2 scheme, in 2+3 coherent control the laser intensities required for maximal effects are larger, but the optical response is richer, the number of optical coefficients is larger, the interference processes occur in smaller regions in the Brillouin zone, and the electronic swarm velocities are higher.
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710 2 $a University of Toronto (Canada). $b Physics. $3 3171865
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