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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Interfacially Enhanced Superconductivity in Fe(Te,Se)/Bi4Te3 Heterostructures.

An-Hsi Chen1, Qiangsheng Lu1, Eitan Hershkovitz2

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 8, 2024
PubMed
Summary

Researchers enhanced superconductivity in Fe(Te,Se) films by interfacing them with the topological insulator Bi4Te3. This approach significantly increased the superconducting transition temperature (Tc), paving the way for advanced quantum computing applications.

Keywords:
molecular beam epitaxyquantum materialstopological materialstopological superconductor

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Computing

Background:

  • Topological superconductivity is crucial for quantum computing.
  • Integrating high-transition-temperature (Tc) superconductors with topological insulators is a key research area.
  • Understanding interfacial effects is vital for advancing superconducting materials.

Purpose of the Study:

  • To explore a novel method for enhancing the superconducting transition temperature (Tc) in Fe(Te,Se) films.
  • To investigate the role of topological insulators in modulating superconductivity.
  • To establish a platform for developing new electronic phases and quantum computing applications.

Main Methods:

  • Interfacing the unconventional superconductor Fe(Te,Se) with the topological insulator Bi-Te system.
  • Utilizing the topological phase Bi4Te3 instead of Bi2Te3 in the low-Se doping regime.
  • Analyzing electronic and crystalline structure of the Bi4Te3 layer.

Main Results:

  • The superconducting transition temperature (Tc) of Fe(Te,Se) increased to 12.5 K when interfaced with Bi4Te3, compared to nominally non-superconducting states.
  • Superconductivity was stabilized in monolayer Fe(Te,Se) films with Tc up to 6 K when interfaced with Bi4Te3.
  • Key factors for Tc enhancement include significant electron transfer, epitaxial strain, and chemical reduction at the interface.

Conclusions:

  • Interfacing Fe(Te,Se) with Bi4Te3 is a successful strategy for enhancing interfacial superconductivity.
  • This approach provides new insights into the nature of superconductivity at interfaces.
  • The findings offer a promising platform for discovering and utilizing novel electronic phases for quantum technologies.