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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Biasing of Metal-Semiconductor Junctions

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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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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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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.
Schottky Barriers
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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Efficiency-Tunable Field-Free Josephson Diode Effect in Nb3Cl8 Based van der Waals Junctions.

Si Li Wu1,2, Zhi-Hui Ren1,2, Liu Yang1,2

  • 1Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.

Nano Letters
|December 12, 2025
PubMed
Summary

We demonstrate a tunable magnetic field-free Josephson diode effect (JDE) in van der Waals heterostructures. Tuning barrier thickness and electric fields control diode efficiency by modulating intrinsic electric polarization.

Keywords:
Nb3Cl8electrical field tunablefield-free Josephson diode effectvan der Waals materialvertical Josephson junction

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Devices

Background:

  • The Josephson diode effect (JDE) enables nonreciprocal current flow in superconducting devices.
  • Understanding the microscopic origins and control mechanisms of field-free JDE is crucial for device applications.
  • Van der Waals (vdW) heterostructures offer tunable electronic properties.

Purpose of the Study:

  • To demonstrate and control a tunable, magnetic field-free Josephson diode effect (JDE).
  • To investigate the role of intrinsic electric polarization in field-free JDE.
  • To explore the potential of vdW heterostructures for nonreciprocal superconducting devices.

Main Methods:

  • Fabrication of NbSe2/Nb3Cl8/NbSe2 vdW Josephson junctions with varying barrier thicknesses.
  • Electrical transport measurements to characterize the Josephson diode effect.
  • Application of out-of-plane electric fields to modulate junction properties.

Main Results:

  • Significant enhancement of field-free JDE efficiency by reducing Nb3Cl8 barrier thickness (1.75% to 20.88%).
  • Tunable diode efficiency via out-of-plane electric field, indicating intrinsic electric polarization.
  • Correlation between polarization strength, barrier thickness, and electric field modulation of JDE.

Conclusions:

  • Intrinsic electric polarization is key to realizing tunable, field-free JDE in vdW heterostructures.
  • JDE in these junctions is sensitive to spontaneous time-reversal symmetry breaking.
  • This work provides a pathway for designing advanced nonreciprocal superconducting devices.