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Biasing of Metal-Semiconductor Junctions01:27

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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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Metal-Semiconductor Junctions01:24

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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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Phase transition from Weyl to self-linked semimetal using bi-circular laser.

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Bi-circularly polarized light induces novel band swapping in non-hermitian Weyl semimetals, creating unique double-ring and self-linked Fermi surfaces. This study explores these topological changes and Berry curvature variations.

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Weylbi-circular lightknotted semimetalnon-hermitian systemstopological phases

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Area of Science:

  • Condensed Matter Physics
  • Topological Materials Science

Background:

  • Non-hermitian Weyl semimetals (NH WSMs) exhibit unique topological properties.
  • The influence of external fields on NH WSMs is an active area of research.

Purpose of the Study:

  • To investigate the impact of bi-circularly (BCL) polarized light on the Fermi surface topology of triple non-hermitian Weyl semimetals.
  • To analyze the resulting band swapping phenomena and their effect on electronic band structures.

Main Methods:

  • Theoretical modeling of non-hermitian systems under BCL light.
  • Analysis of Fermi surface topology and band structures.
  • Calculation of Berry curvature changes.

Main Results:

  • BCL light modifies the symmetry of triple NH WSMs, inducing unusual band swapping.
  • Observed swapping between imaginary bands, with and without exceptional degeneracies.
  • Formation of unique Fermi surfaces, including double rings and self-linked structures.

Conclusions:

  • BCL polarized light drives significant topological transitions in NH WSMs.
  • The observed band swapping leads to novel Fermi surface geometries.
  • These findings offer new insights into the control of topological states in quantum materials.