Fermions, criticality and superconductivity

Leiden Repository

Fermions, criticality and superconductivity

Type: Doctoral Thesis
Title: Fermions, criticality and superconductivity
Author: She, Jian-Huang
Publisher: Faculty of Science, Leiden University
Issue Date: 2011-05-03
Keywords: Condensed matter physics
Constrained path integral
Fermion sign problem
Quantum criticality
Unconventional superconductivity
Abstract: By tuning control parameters like pressure, magnetic field or doping, a fermionic system can be driven to a state with vanishing Fermi energy and power law behavior in many observables. Such fermionic quantum critical states have been identified in systems including heavy fermions, cuprates and pnictides. We study the superconducting transition in such systems. We propose that the superconducting instability, which is marginal in Fermi liquids, becomes relevant, leading naturally to a high transition temperature. This picture has been verified numerically in the 2-dimensional Hubbard model by using the Dynamical Cluster Approximation. We also propose tunneling experiments which can distinguish our mechanism from others.
Description: Promotor: J. Zaanen
With summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: She, J.H., 2011, Doctoral thesis, Leiden University
Series/Report no.: Casimir PHD Series
2011-06
Sponsor: NWO
Handle: http://hdl.handle.net/1887/17607
 

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