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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Spin filtering by field-dependent resonant tunneling.

Zoran Ristivojevic¹, George I Japaridze, Thomas Nattermann

¹Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany.

Physical Review Letters

|April 7, 2010

Summary

Spin-polarized current in quantum wires is achievable with specific impurity configurations and tunable parameters. Complete spin polarization is possible at low temperatures if electron interactions are not excessively repulsive.

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Fabrication and Characterization of Superconducting Resonators

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Published on: May 21, 2016

Area of Science:

Condensed matter physics
Quantum transport phenomena

Background:

Quantum wires are fundamental systems for studying electron transport.
Interactions and impurities significantly influence quantum transport properties.
External magnetic fields can control spin-dependent phenomena.

Purpose of the Study:

To theoretically investigate spin-polarized transport in a spinful, interacting quantum wire.
To analyze the effect of two pointlike impurities on current.
To identify conditions for achieving tunable spin polarization.

Main Methods:

Theoretical modeling of electron transport.
Analysis of a one-channel interacting quantum wire model.
Consideration of an external magnetic field and two impurities.
Examination under small voltage bias.

Main Results:

Spin-polarized current emerges at specific, tunable points in the parameter space.
Complete spin polarization is attainable under certain conditions.
Repulsive electron-electron interaction strength is a critical factor.

Conclusions:

The study demonstrates tunability of spin-polarized current in interacting quantum wires.
Low temperatures and moderate repulsive interactions are key for achieving full spin polarization.
External magnetic fields and impurity configurations offer control over spin transport.