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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Spectroscopy ofd-wave superconductors using DNA as a probing tip.

Y Takagaki1

  • 1Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5-7, 10117 Berlin, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 20, 2025
PubMed
Summary
This summary is machine-generated.

DNA molecules can probe d-wave superconductors through Andreev reflection. Weakening DNA-superconductor coupling significantly enhances the zero-bias peak, revealing superconductor properties.

Keywords:
Andreev reflectionDNAd-wave superconductorspectroscopy

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Area of Science:

  • Condensed Matter Physics
  • Nanoscience
  • Biophysics

Background:

  • Andreev reflection is a key phenomenon in superconductivity.
  • DNA molecules offer unique one-dimensional transport properties.
  • d-wave superconductors possess characteristic midgap surface states.

Purpose of the Study:

  • Investigate Andreev reflection in DNA-superconductor systems.
  • Demonstrate DNA's utility as a spectroscopic probe for superconductors.
  • Analyze the influence of DNA structure and coupling on reflection properties.

Main Methods:

  • Simulations using a two-leg ladder model for DNA.
  • Modeling DNA as homopolymers.
  • Analyzing Andreev reflection probability under varying coupling and bias voltage.

Main Results:

  • An increased Andreev reflection probability at zero bias due to d-wave superconductor midgap states.
  • Significant enhancement (orders of magnitude) of the zero-bias peak with weakened coupling.
  • High sensitivity of reflection probability to voltage bias and d-wave symmetry orientation.
  • Quantum interference effects leading to a dip-plateau-peak structure at zero bias.

Conclusions:

  • DNA serves as a sensitive probe for d-wave superconductor spectroscopy.
  • The observed phenomena are strongly dependent on DNA-superconductor coupling and molecular parameters.
  • Inter-strand coupling in DNA influences the zero-bias features, allowing for its evaluation.