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Engineering magnetoresistance: a new perspective.

Moumita Patra¹, Santanu K Maiti¹, Shreekantha Sil²

¹Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata-700 108, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|May 18, 2019

Summary

This summary is machine-generated.

Researchers propose a novel magnetic quantum device for high magnetoresistance (MR). Utilizing a quasiperiodic Aubry-André-Harper (AAH) layer, MR can be tuned externally, with dephasing effects explored for realistic applications.

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Area of Science:

Condensed Matter Physics
Quantum Materials Science
Spintronics

Background:

High magnetoresistance (MR) is crucial for advanced magnetic quantum devices.
Controlling MR in such devices often relies on material properties and device architecture.
Quasiperiodic structures offer unique electronic properties that can be exploited for novel functionalities.

Purpose of the Study:

To propose a new quantum device design for achieving a high degree of magnetoresistance (MR).
To investigate the role of a quasiperiodic non-magnetic (NM) spacer, based on the Aubry-André-Harper (AAH) model, in controlling MR.
To explore the impact of dephasing on magnetotransport properties and assess experimental feasibility.

Main Methods:

Theoretical proposal of a magnetic quantum device with a quasiperiodic NM spacer.
Utilizing the Aubry-André-Harper (AAH) model for the spacer layer to leverage its gapped spectrum.
Incorporating dephasing effects into the magnetotransport calculations.
Analyzing the tunability of MR by external phase tuning of the AAH model.

Main Results:

The proposed device achieves a high degree of magnetoresistance (MR).
The quasiperiodic AAH spacer's gapped spectrum provides non-trivial MR features.
External tuning of the AAH phase allows for selective control over MR.
Dephasing effects were analyzed to enhance the model's realism.

Conclusions:

A novel quantum device design offers a pathway to high magnetoresistance.
The Aubry-André-Harper quasiperiodic model is effective for MR control in magnetic quantum devices.
External phase tuning and dephasing are key factors in optimizing device performance.
The proposed system holds promise for experimental realization and applications in spintronics.