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Computational and experimental studi...

Wong, Vance.

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Computational and experimental studies of coherence and energy flow in microscopic and mesoscopic systems.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Computational and experimental studies of coherence and energy flow in microscopic and mesoscopic systems./
作者:	Wong, Vance.
面頁冊數:	259 p.
附註:	Adviser: Martin Gruebele.
Contained By:	Dissertation Abstracts International62-11B.
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3030494
ISBN:	0493436170

Computational and experimental studies of coherence and energy flow in microscopic and mesoscopic systems.
Wong, Vance.

Computational and experimental studies of coherence and energy flow in microscopic and mesoscopic systems. - 259 p.

Adviser: Martin Gruebele.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.

A proper quantum treatment of dynamical processes has become increasingly important for progress in emerging information technologies such as quantum computation and atomic and molecular scale electronics and fabrication. Coherent quantum control of vibrational and chemical reaction dynamics also requires a detailed understanding of energy flow dynamics at the microscopic level. As a step towards providing the necessary understanding, we introduce a geometrically motivated approach to quantum evolution, and find the predictions of the theory to be in good agreement with numerical simulations of the vibrational dynamics of the four atom polyatomic, thiophosgene. In particular, the simulations verify previous results which asserted that vibrational energy flow can be of a qualitatively different nature than what is commonly assumed. We then introduce a local random matrix model which we believe to contain the minimum requirements necessary for the existence of slowed dephasing. Numerical results indicate that the hierarchical structure inherent in the matrix construction is of crucial importance to support slow energy flow dynamics. We also explore the quantum dynamics of a reduced dimensionality spin-boson model, and find that decoherence and energy flow in this paradigm for open quantum systems can also exhibit slow dynamics. We speculate that the discreteness of our model is responsible for this, and present numerical evidence for it.

ISBN: 0493436170Subjects--Topical Terms:

560527
Chemistry, Physical.

Computational and experimental studies of coherence and energy flow in microscopic and mesoscopic systems.
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245 1 0 $a Computational and experimental studies of coherence and energy flow in microscopic and mesoscopic systems.
300 $a 259 p.
500 $a Adviser: Martin Gruebele.
500 $a Source: Dissertation Abstracts International, Volume: 62-11, Section: B, page: 5145.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.
520 $a A proper quantum treatment of dynamical processes has become increasingly important for progress in emerging information technologies such as quantum computation and atomic and molecular scale electronics and fabrication. Coherent quantum control of vibrational and chemical reaction dynamics also requires a detailed understanding of energy flow dynamics at the microscopic level. As a step towards providing the necessary understanding, we introduce a geometrically motivated approach to quantum evolution, and find the predictions of the theory to be in good agreement with numerical simulations of the vibrational dynamics of the four atom polyatomic, thiophosgene. In particular, the simulations verify previous results which asserted that vibrational energy flow can be of a qualitatively different nature than what is commonly assumed. We then introduce a local random matrix model which we believe to contain the minimum requirements necessary for the existence of slowed dephasing. Numerical results indicate that the hierarchical structure inherent in the matrix construction is of crucial importance to support slow energy flow dynamics. We also explore the quantum dynamics of a reduced dimensionality spin-boson model, and find that decoherence and energy flow in this paradigm for open quantum systems can also exhibit slow dynamics. We speculate that the discreteness of our model is responsible for this, and present numerical evidence for it.
520 $a The dynamics of STM based hydrogen desorption at silicon surfaces is another process in which an open systems approach is appropriate. Therefore, we adopt a master equation model previously applied to this problem, and propose resonant IR overtone excitation of the surface Si-H vibration as a method for enhancing desorption rates. Finally, we present findings of our experimental efforts at implementing this proposal thus far.
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