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Quantized Conductance through a Spin-Selective Atomic Point Contact.

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We developed a microscopic spin filter for cold atoms in a quantum point contact, achieving fully spin-polarized currents and conductance quantization. This breakthrough enables studying spin interactions in quantum devices.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomic physics

Background:

  • Quantum point contacts (QPCs) are crucial for studying electron transport.
  • Controlling electron spin is fundamental for spintronics.
  • Achieving spin polarization while maintaining conductance quantization is a significant challenge.

Purpose of the Study:

  • To implement a microscopic spin filter for cold fermionic atoms.
  • To create fully spin-polarized currents within a QPC.
  • To investigate the interplay of spin splitting and interactions in a quantum system.

Main Methods:

  • Utilizing a quantum point contact (QPC) with cold fermionic atoms.
  • Employing a near-resonant optical tweezer to induce a localized Zeeman shift.
  • Observing conductance quantization and spin polarization.

Main Results:

  • Demonstrated a microscopic spin filter for fermionic atoms.
  • Achieved fully spin-polarized currents.
  • Observed conductance quantization was retained.
  • Measured a renormalization of the Zeeman shift due to few-atom interactions.

Conclusions:

  • The developed scheme acts as a microscopic spin filter, analogous to spintronic devices.
  • This technique allows for the study of spin splitting and interactions far from equilibrium.
  • Opens new avenues for quantum device research and fundamental physics exploration.