Theory of Point Contact Spectroscopy in Correlated Materials

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  • Theory of Point Contact Spectroscopy in Correlated Materials Book Detail

  • Author :
  • Release Date : 2015
  • Publisher :
  • Genre :
  • Pages : 6
  • ISBN 13 :
  • File Size : 88,88 MB
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Theory of Point Contact Spectroscopy in Correlated Materials by PDF Summary

Book Description: Here, we developed a microscopic theory for the point-contact conductance between a metallic electrode and a strongly correlated material using the nonequilibrium Schwinger-Kadanoff-Baym-Keldysh formalism. We explicitly show that, in the classical limit, contact size shorter than the scattering length of the system, the microscopic model can be reduced to an effective model with transfer matrix elements that conserve in-plane momentum. We found that the conductance dI/dV is proportional to the effective density of states, that is, the integrated single-particle spectral function A([omega] = eV) over the whole Brillouin zone. From this conclusion, we are able to establish the conditions under which a non-Fermi liquid metal exhibits a zero-bias peak in the conductance. Lastly, this finding is discussed in the context of recent point-contact spectroscopy on the iron pnictides and chalcogenides, which has exhibited a zero-bias conductance peak.

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Point-Contact Spectroscopy

Point-Contact Spectroscopy

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Various experimental techniques for point contact production are described. Examples of point-contact spectra are presented for pure metals, alloys and compound

Strongly Correlated Systems

Strongly Correlated Systems

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The continuous evolution and development of experimental techniques is at the basis of any fundamental achievement in modern physics. Strongly correlated system