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Optical spectroscopy of novel materials.

Reijnders, Anjan A.

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Optical spectroscopy of novel materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Optical spectroscopy of novel materials./
作者:	Reijnders, Anjan A.
面頁冊數:	145 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.
Contained By:	Dissertation Abstracts International76-08B(E).
標題:	Theoretical physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3687570
ISBN:	9781321651928

Optical spectroscopy of novel materials.
Reijnders, Anjan A.

Optical spectroscopy of novel materials. - 145 p.

Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2014.

This item must not be sold to any third party vendors.

Optical Spectroscopy is a well-established experimental technique for the study of solids, gasses, and liquids. This thesis focuses on two broad topics related to optical spectroscopy; experimental instrumentation, and its application to novel materials. The first half of the thesis discusses the design and construction of a novel, multifunctional magneto-optical spectroscopy apparatus with exceptional repeatability. Included are the operating principles of FTIR reflectance and transmittance spectroscopy, and the optical ray-tracing design, physical design, and characterization of a custom built magneto-optical spectroscopy apparatus. The second half of the thesis discusses the experimental results of a comprehensive spectroscopic study of Topological Insulators and thermoelectric Pb0.77Sn0.23Se. Topological Insulators (TIs) are a recently discovered phase of matter in which highly conductive free carriers are found on the surface of small band-gap insulators. A challenge in TI research is the experimental isolation of conductive surface states from the bulk states, which are frequently plagued by residual conductivity due to impurities. In this work, optical spectroscopy is used to simultaneously probe the bulk and surface states to study their individual optical properties, in addition to their coupling. Using variable temperature, crystal orientation, and a broad frequency range, we identify compounds with the most resistive bulk states, and provide new insights into carrier dynamics, surface state conductance suppression as a function of temperature, and practical material optimization guidelines for application purposes. A comprehensive optical investigation of Pb0.77Sn0.23Se is also discussed. This is a promising thermoelectric, which exhibits a temperature dependent band inversion, associated with a topological phase transition. We find clear evidence for this band inversion, and find a bulk carrier lifetime dominated by electron-acoustic phonon scattering, but insensitive to the band inversion. Due to the high bulk doping level, no surface state signatures are observed. The thesis concludes with a novel analytical technique to reliably remove Fabry-Perot fringes from optical data. Moreover, this technique can be used to determine a semitransparent sample's thickness and evaluate its structural integrity in a single measurement. To illustrate its efficacy, the technique is applied to optical spectra of 9 different samples, including topological insulators, thermoelectrics, semiconductors, and magnetic insulators.

ISBN: 9781321651928Subjects--Topical Terms:

2144760
Theoretical physics.

Optical spectroscopy of novel materials.
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502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2014.
506 $a This item must not be sold to any third party vendors.
520 $a Optical Spectroscopy is a well-established experimental technique for the study of solids, gasses, and liquids. This thesis focuses on two broad topics related to optical spectroscopy; experimental instrumentation, and its application to novel materials. The first half of the thesis discusses the design and construction of a novel, multifunctional magneto-optical spectroscopy apparatus with exceptional repeatability. Included are the operating principles of FTIR reflectance and transmittance spectroscopy, and the optical ray-tracing design, physical design, and characterization of a custom built magneto-optical spectroscopy apparatus. The second half of the thesis discusses the experimental results of a comprehensive spectroscopic study of Topological Insulators and thermoelectric Pb0.77Sn0.23Se. Topological Insulators (TIs) are a recently discovered phase of matter in which highly conductive free carriers are found on the surface of small band-gap insulators. A challenge in TI research is the experimental isolation of conductive surface states from the bulk states, which are frequently plagued by residual conductivity due to impurities. In this work, optical spectroscopy is used to simultaneously probe the bulk and surface states to study their individual optical properties, in addition to their coupling. Using variable temperature, crystal orientation, and a broad frequency range, we identify compounds with the most resistive bulk states, and provide new insights into carrier dynamics, surface state conductance suppression as a function of temperature, and practical material optimization guidelines for application purposes. A comprehensive optical investigation of Pb0.77Sn0.23Se is also discussed. This is a promising thermoelectric, which exhibits a temperature dependent band inversion, associated with a topological phase transition. We find clear evidence for this band inversion, and find a bulk carrier lifetime dominated by electron-acoustic phonon scattering, but insensitive to the band inversion. Due to the high bulk doping level, no surface state signatures are observed. The thesis concludes with a novel analytical technique to reliably remove Fabry-Perot fringes from optical data. Moreover, this technique can be used to determine a semitransparent sample's thickness and evaluate its structural integrity in a single measurement. To illustrate its efficacy, the technique is applied to optical spectra of 9 different samples, including topological insulators, thermoelectrics, semiconductors, and magnetic insulators.
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