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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Monolayer Kagome metals AV3Sb5.

Sun-Woo Kim1,2,3, Hanbit Oh2, Eun-Gook Moon4

  • 1Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea.

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Monolayer kagome metals AV3Sb5 exhibit unique symmetries and enriched van Hove singularities. This enables tuning competing instabilities like charge density waves and superconductivity for designer quantum phases.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Layered kagome metals AV3Sb5 are known for frustrated geometry, correlations, and topology.
  • These materials offer a unique platform for fundamental physics research.

Purpose of the Study:

  • To investigate the properties of a two-dimensional monolayer form of AV3Sb5.
  • To explore the impact of reduced dimensionality on the electronic and emergent properties of kagome metals.

Main Methods:

  • First-principles calculations
  • Mean-field theory
  • Electronic structure analysis

Main Results:

  • AV3Sb5 can crystallize in a unique monolayer form with distinct symmetries from its bulk counterpart.
  • The monolayer exhibits enriched van Hove singularities, leading to competing instabilities.
  • These instabilities include charge density waves and s- and d-wave superconductivity.
  • The competition between different electronic orders can be controlled by electron filling.

Conclusions:

  • Monolayer AV3Sb5 presents a novel platform for realizing designer quantum phases.
  • The tunable nature of competing instabilities makes it promising for future quantum materials applications.