Spectroscopy of correlated nanowires

Bronn, Nicholas

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https://hdl.handle.net/2142/44424 Copy

Description

Title

Spectroscopy of correlated nanowires

Author(s)

Bronn, Nicholas

Issue Date

2013-05-24T22:15:34Z

Director of Research (if dissertation) or Advisor (if thesis)

Mason, Nadya

Doctoral Committee Chair(s)

Bezryadin, Alexey

Committee Member(s)

• Mason, Nadya
• Oono, Yoshitsugu
• Vishveshwara, Smitha

Department of Study

Physics

Discipline

Physics

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• Nanowires
• Nanotubes
• Nonequilibrium tunnel spectroscopy
• Random telegraph noise
• La2/3Sr1/3MnO3 (LSMO)

Abstract

This dissertation is concerned with spectroscopy of correlated nanowires, in particular carbon nanotubes and La_{2/3}Sr{1/3}MnO_3 (LSMO) nanowires. The technique of nonequilibrium superconducting tunnel spectroscopy is performed on carbon nanotube devices, and after subsequent deconvolution, the nonequilibrium distribution function is calculated. The distribution function provides information on how electrons interact as they traverse the nanotube, and its spatial dependence indicates whether electron transport is ballistic or di usive. This technique is also used to identify inelastic scattering from local defects that are tunable with a gate voltage. In the case of LSMO nanowires, competition between conducting and insulating domains exist in the same crystal and at the same time. This manifests as random telegraph noise in electron transport experiments. This noise gives information on the lifetime, genesis, memory, and size of the domains, which arise from competing microscopic processes that are energetically degenerate at low temperatures.

Graduation Semester

2013-05

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http://hdl.handle.net/2142/44424

Copyright and License Information

Copyright 2013 Nicholas Bronn

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