자료유형  

 학위논문

Control Number  

0017162992

International Standard Book Number  

9798384340676

Dewey Decimal Classification Number  

600

Main Entry-Personal Name  

Zhang, Xinyang.

Publication, Distribution, etc. (Imprint  

[S.l.] : Stanford University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

165 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

General Note  

Advisor: Kapitulnik, Aharon.

Dissertation Note  

Thesis (Ph.D.)--Stanford University, 2024.

Summary, Etc.  

요약Many experiments investigating superconductor-insulator transition (SIT) exhibited low-temperature resistance saturation, which was interpreted as an anomalous metallic (AM) phase emerging from a "failed" superconductor, thus challenging conventional theory. In this thesis, I studied a two-dimensional granular system of random array of indium islands grown on amorphous indium-oxide. By tuning the inter-grain couplings, we observed robust AM behavior under careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation was shown to strengthen the tendency of superconductivity, promoting phase coherence in the granular system.In light of observed vestiges of the true self-duality typically associated with a magnetic-field-tuned SIT (H-SIT), we extended the analysis to a similar AM phase originating from a "failed" insulator, thus completing an exploration of the quantum superconductor-metal-insulator transitions. The granular morphology of the material implies a system of Josephson junctions with a broad distribution of Josephson coupling EJ and charging energy EC, with an H-SIT determined by the competition between EJ and EC. Aiming to understand the AM behavior from a duality perspective, we invoked macroscopic quantum tunneling effects to explain the temperature-independent resistance where the "failed" superconductor/insulator results from quantum fluctuations of phase/charge.Furthermore, we examined the system's low-frequency electrodynamic response, using our custom-built highly-sensitive mutual inductance probe. This allowed us to extend resistance measurement to the micro-Ohm regime and to extract quantitative information of the dynamical response in the quantum critical regime proximate to the quantum superconductor-metal transition. The coexistence of robust superfluid density and dissipative response pointed to a possible form of gapless superconductivity in granular superconductors. Building upon a series of systematic studies, we have established a holistic understanding of the robust and ubiquitous AM phase in two-dimensional granular superconductors.

Subject Added Entry-Topical Term  

Metals.

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Phase transitions.

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Energy.

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Electrons.

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Superconductivity.

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High temperature superconductors.

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Vortices.

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Electromagnetism.

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Thin films.

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Magnetic fields.

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Electric fields.

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Atomic physics.

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Condensed matter physics.

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Electromagnetics.

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High temperature physics.

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Low temperature physics.

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Materials science.

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Thermodynamics.

Added Entry-Corporate Name  

Stanford University.

Host Item Entry  

Dissertations Abstracts International. 86-03B.

Electronic Location and Access  

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Control Number  

joongbu:655285