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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Published on: February 1, 2017

Spin-to-charge conversion of mesoscopic spin currents.

Peter Stano¹, Philippe Jacquod

¹Physics Department, University of Arizona, 1118 East Fourth Street, Tucson, Arizona 85721, USA.

Physical Review Letters

|June 15, 2011

Summary

Researchers demonstrate a novel method for measuring spin currents in mesoscopic systems using a single-channel voltage probe. This technique allows for the direct detection of spin currents, a long-standing challenge in condensed matter physics.

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Area of Science:

Condensed Matter Physics
Mesoscopic Systems
Spintronics

Background:

Theoretical studies predict spin current generation in spin-orbit coupled mesoscopic systems via electric currents.
Experimental measurement of these generated spin currents remains a significant challenge in the field.

Purpose of the Study:

To develop and demonstrate a method for measuring mesoscopic spin currents.
To investigate the use of a single-channel voltage probe for detecting spin currents in lateral heterostructures.

Main Methods:

Utilizing a single-channel voltage probe in conjunction with lateral heterostructures.
Analyzing the charge current through a quantum point contact (I(qpc)) as a function of an external Zeeman field (B).
Numerical simulations to confirm the theoretical predictions and experimental method.

Main Results:

The charge current I(qpc) exhibits an odd dependence on the Zeeman field B in the presence of a spin current.
Conversely, I(qpc) shows an even dependence on B when no spin current is present.
The derivative of I(qpc) with respect to B at zero field is directly proportional to the spin current magnitude.

Conclusions:

A practical method for measuring mesoscopic spin currents using a voltage probe has been established.
The proposed technique offers a pathway to experimentally verify theoretical predictions in spintronics.
The findings pave the way for advancements in understanding and manipulating spin currents.