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The algebraic spin liquid of a possible model description for the normal state of underdoped high temperature superconductors

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dc.contributor.advisor Xiao-Gang Wen. en_US Rantner, Walter, 1973- en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Physics. en_US 2005-10-14T19:44:51Z 2005-10-14T19:44:51Z 2002 en_US 2002 en_US
dc.description Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002. en_US
dc.description Includes bibliographical references (p. 92-95). en_US
dc.description.abstract 16 years and counting ... In 1986 Bednorz and Muller discovered the layered perovskite structure (La - Ba)2Cu04 which showed the phenomenon of superconductivity at the unprecedented high temperature of Tc = 33 K. In the ensuing months and years it became more and more apparent that the cuprates, as the materials came to be known, show very peculiar correlations in their "normal" state at temperatures T > Tc. The majority of this thesis is concerned with this abnormal "normal" state, attempting to extract a coherent picture for the strange phenomenology. The underlying theoretical framework is a slave particle description of the tJ model proposed by Wen and Lee. The conceptual background is rooted in Anderson's proposal of spin charge separation as the key emergent phenomenon in cuprate physics. After a brief motivation we look at single particle tunneling into the cuprate's superconducting state from the perspective of both d-wave BCS and the SU(2) slave boson theory of Wen and Lee. Both approaches work well close to zero tunneling bias. The slave particle formulation however also naturally incorporates the particle/hole asymmetric background that is seen in experiments. en_US
dc.description.abstract (cont.) The question of single particle correlations studied experimentally via angle resolved photo emission experiments motivates the analysis of the next chapter. The broad spectral line-shapes seen experimentally imply the absence of well defined quasi-particles in the Fermi liquid sense. We study how gauge fluctuations arising from our use of slave particle coordinates affect the physical hole spectral function. The primary influence of gauge fluctuations turns out to be through their confining tendency on the vertex rather than as a scattering field for the slave particles. The last chapter discusses the effect of gauge fluctuations on the spin susceptibility and shows that they play a vital role in restoring Neel correlations. This allows us to give a natural explanation for the spin related phenomenology of underdoped cuprates. en_US
dc.description.statementofresponsibility by Walter Rantner. en_US
dc.format.extent 97 p. en_US
dc.format.extent 4324023 bytes
dc.format.extent 4323832 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.subject Physics. en_US
dc.title The algebraic spin liquid of a possible model description for the normal state of underdoped high temperature superconductors en_US
dc.type Thesis en_US Ph.D. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Physics. en_US
dc.identifier.oclc 52562486 en_US

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