Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Detecting spin-polarized currents in ballistic nanostructures.

R M Potok1, J A Folk, C M Marcus

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|December 18, 2002
PubMed
Summary

Researchers developed a mesoscopic spin polarizer/analyzer system to measure spin polarization in quantum point contacts. This system achieved over 70% spin polarization at low temperatures and high magnetic fields.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Voltage-Tuned Anomalous-Metal to Metal Transition in Hybrid Josephson Junction Arrays.

Physical review letters·2025
Same author

Voltage-Controlled Synthesis of Higher Harmonics in Hybrid Josephson Junction Circuits.

Physical review letters·2024
Same author

Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions.

Physical review letters·2023
Same author

Observation of electronic modes in open cavity resonator.

Nature communications·2023
Same author

Andreev Modes from Phase Winding in a Full-Shell Nanowire-Based Transmon.

Physical review letters·2021
Same author

Quantum Dot Parity Effects in Trivial and Topological Josephson Junctions.

Physical review letters·2020

Area of Science:

  • Spintronics
  • Mesoscopic physics
  • Quantum electronics

Background:

  • Quantum point contacts (QPCs) are crucial for controlling electron transport at the nanoscale.
  • Measuring spin polarization in mesoscopic systems is essential for spintronic device development.
  • Previous methods for spin analysis in such systems have limitations.

Purpose of the Study:

  • To demonstrate a novel mesoscopic spin polarizer/analyzer system.
  • To enable the measurement of spin polarization of current from a QPC in a large in-plane magnetic field.
  • To investigate spin-dependent transport phenomena in mesoscopic conductors.

Main Methods:

  • Utilized a transverse electron focusing geometry to couple emitter and collector QPCs.
  • Operated the QPCs at a bias transmitting a single spin state (conductance < e^2/h).

Related Experiment Videos

  • Applied a large in-plane magnetic field (7 T) and low temperature (300 mK).

    • Main Results:

    • Successfully measured spin polarization of current from a QPC.
    • Observed that collector voltage is dependent on the incident spin polarization.
    • Achieved spin polarizations exceeding 70% for both emitter and collector.

    Conclusions:

    • The developed system effectively polarizes and analyzes electron spins in mesoscopic conductors.
    • High spin polarization is achievable in QPCs under specific magnetic field and temperature conditions.
    • This technique offers a new pathway for probing and utilizing spin properties in quantum devices.