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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
RLC Circuit as a Damped Oscillator01:30

RLC Circuit as a Damped Oscillator

An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Current Growth And Decay In RL Circuits01:30

Current Growth And Decay In RL Circuits

The current growth and decay in RL circuits can be understood by considering a series RL circuit consisting of a resistor, an inductor, a constant source of emf, and two switches. When the first switch is closed, the circuit is equivalent to a single-loop circuit consisting of a resistor and an inductor connected to a source of emf. In this case, the source of emf produces a current in the circuit. If there were no self-inductance in the circuit, the current would rise immediately to a steady...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

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Josephson current oscillation in a Rashba ring.

J Wang1, K S Chan

  • 1Department of Physics, Southeast University, Nanjing 210096, People's Republic of China. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 23, 2011
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate magnetic-field-free Josephson current modulation in a superconducting quantum interference device using Rashba spin-orbital coupling (RSOC). This electrical control of supercurrents opens avenues for novel superconductor device design.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena

Background:

  • Superconducting quantum interference devices (SQUIDs) are crucial for sensitive magnetic field detection.
  • Modulating Josephson currents typically requires magnetic fields or materials, limiting device applications.

Purpose of the Study:

  • To investigate the modulation of Josephson current in a one-dimensional ring-SQUID using Rashba spin-orbital coupling (RSOC).
  • To achieve magnetic-field-free control over supercurrents in superconducting devices.

Main Methods:

  • Theoretical proposal utilizing RSOC in a one-dimensional ring-SQUID.
  • Analysis of spin-dependent quantum interference of spin wavefunctions.
  • Investigating the role of RSOC precession and asymmetry-induced electron traveling phases.

Main Results:

  • Observed supercurrent oscillation driven by spin-dependent quantum interference modulated by RSOC.
  • Demonstrated a pure spin current in the ground state due to combined phase effects.
  • Showcased electrical control of supercurrent without external magnetic fields or materials.

Conclusions:

  • RSOC provides an effective means to modulate Josephson currents in ring-SQUIDs.
  • The findings enable the design of novel superconducting devices with purely electrical control.
  • This approach offers a pathway for spintronic superconductor applications.