Impurity effects in interacting quantum many-body systems

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dc.contributor.advisorSi, Qimiaoen_US
dc.creatorSun, Junen_US
dc.date.accessioned2009-06-04T06:28:59Zen_US
dc.date.available2009-06-04T06:28:59Zen_US
dc.date.issued2004en_US
dc.description.abstractImpurities have a wide range of effects in interacting quantum many-body systems. They can interplay with interactions and lead to new electronic states of matter. They can also serve as a probe of an "intrinsic" many-body system. In this thesis, we consider the effects of impurities in three quantum many-body systems. First, we study the transport properties of a two-dimensional interacting electronic system with dilute quenched disorder. We find that the ground state is in fact a metallic state and in-plane magnetic-field can drive it to an insulating one. Second, we address the orthogonality catastrophe in Bose-Einstein condensate with a local impurity at its center. It is shown that the orthogonality effect in a Bose system has a stretched-exponential form, stronger than the algebraic orthogonality of a Fermi counterpart. The corresponding absorption spectrum is also determined. Finally, we analyze the effects of a spin resonance mode on the scattering tunneling microscopy(STM) spectra of a d-wave superconductor near a potential scattering center. We identify a counterintuitive two-unit-cell spatial modulation, at o ≃ +/-(Delta0 + O0)/h, where Delta 0 is the energy gap and O0 is the resonance mode energy. This effect can be tested by the Fourier-transformed STM technique.en_US
dc.format.extent95 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS PHYS. 2005 SUNen_US
dc.identifier.citationSun, Jun. "Impurity effects in interacting quantum many-body systems." (2004) Diss., Rice University. <a href="https://hdl.handle.net/1911/18819">https://hdl.handle.net/1911/18819</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/18819en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectPhysicsen_US
dc.subjectElectromagneticsen_US
dc.subjectCondensed matter physicsen_US
dc.subjectAtomic physicsen_US
dc.titleImpurity effects in interacting quantum many-body systemsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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