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Ferromagnetic proximity effect in a ferromagnet-quantum-dot-superconductor device.

L Hofstetter¹, A Geresdi, M Aagesen

¹Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Physical Review Letters

|September 28, 2010

Summary

The ferromagnetic proximity effect in InAs nanowire quantum dots was investigated. A ferromagnetic lead induces an exchange field, splitting the Kondo resonance and creating a subgap feature with a superconductor.

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Area of Science:

Condensed Matter Physics
Quantum Dot Physics
Spintronics

Background:

Investigating the ferromagnetic proximity effect is crucial for understanding spin interactions in nanoscale devices.
Quantum dots coupled to ferromagnetic and superconducting leads offer a platform for exploring exotic quantum phenomena.

Purpose of the Study:

To study the ferromagnetic proximity effect in InAs nanowire-based quantum dots.
To analyze the influence of a ferromagnetic lead on spin-1/2 Kondo resonance.
To explore the interplay between ferromagnetic and superconducting correlations.

Main Methods:

Utilizing InAs nanowire-based quantum dots.
Coupling quantum dots to ferromagnetic (F) and superconducting (S) leads.
Observing the splitting of the spin-1/2 Kondo resonance.

Main Results:

The ferromagnetic lead induces a local exchange field on the quantum dot.
The amplitude and sign of the exchange field vary with charge states.
An exchange field-related subgap feature emerges due to F and S correlations.

Conclusions:

The ferromagnetic proximity effect significantly influences quantum dot properties.
The observed phenomena pave the way for novel spintronic and quantum computing applications.
Understanding these interactions is key to designing advanced quantum devices.