Topics in statistical mechanics and quantum optics /
The first part of the dissertation discusses various aspects of the problem of Bose-Einstein condensation. The emphasis is on the problem of the statistics of the condensate occupation. To start with, an introduction to the subject matter is given with a brief description of the inter-relations betw...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2002.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=765069791&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The first part of the dissertation discusses various aspects of the problem of Bose-Einstein condensation. The emphasis is on the problem of the statistics of the condensate occupation. To start with, an introduction to the subject matter is given with a brief description of the inter-relations between various ensembles of statistical mechanics. Thereafter, various methods studied for the canonical ensemble description of trapped ideal Bose gas are discussed in great details. They include the master equation approach developed by Scully and others and an independent oscillator model which is formally similar to the Maxwell's daemon ensemble. Thereafter, strategies to convert these results into the microcanonical ensemble description are also considered with a few examples. Various topics bound by a common theme based on the principle of quantum coherence are studied within the domain of atomic physics in the second part of the dissertation. First, we present a scheme which exploits interference of incoherent pump processes to achieve strong control over the total spontaneous emission from a three-level atom. Thereafter, we discuss various schemes to achieve radiative cooling without the presence of spontaneous emission on the cooling transition via quantum coherence. This also allows us to achieve cooling to an internal absolute zero of temperature in an atomic system in very small number of steps, in contrast to an accepted opinion about the third law of thermodynamics. In the last chapter we discuss a regime in which transient gain without inversion is possible in a three level lambda system. We show that in this regime coherent Raman amplification and absorption are canceled through a specific preparation of the initial states and interaction with a thermal reservoir. |
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| Item Description: | Vita. "Major Subject: Physics". |
| Physical Description: | x, 190 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 146-152). |