Proposal for measurement of coherent spin dynamics of individual magnetic dopants in a semiconductor using low-field magnetoresistance of spin-polarized scanning tunneling spectroscopy (Conference Presentation)

Stephen McMillan; Nicholas J. Harmon; Michael E. Flatté

doi:10.1117/12.2322503

18 September 2018 Proposal for measurement of coherent spin dynamics of individual magnetic dopants in a semiconductor using low-field magnetoresistance of spin-polarized scanning tunneling spectroscopy (Conference Presentation)

Stephen McMillan, Nicholas J. Harmon, Michael E. Flatté

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107322Z (2018) https://doi.org/10.1117/12.2322503
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Individual magnetic impurities or small collections of magnetic impurities in III-V semiconductors can be identified via scanning tunneling microscopy (STM) [1,2], their exchange interaction can be measured [3], and they can have remarkably long spin coherence times [4]. Spin-1/2 impurities are able to be addressed individually and the eigenstates tailored allowing the construction of engineered spin networks [5]. We describe an approach to explore the coherent spin dynamics of a spin-1/2 defect coupled to an additional spin-1/2 defect via exchange interaction with a spin-polarized STM contact through low-field magnetoresistance. The inherent anisotropy [2,3,5,6] in conjunction with the applied magnetic field should allow one to describe a single spin Hanle curve. In addition, measurements of the spin coherence time and the local hyperfine interaction should be feasible. This analysis is then used to guide the examination of coherent spin-dynamics involving coupled Mn-hole complexes in III-V semiconductors. [1] J. M. Tang and M. E. Flatté, Phys. Rev. Lett. 92, 047201 (2004). [2] A. M. Yakunin et al., Phys. Rev. Lett. 92, 216806 (2004). [3] D. Kitchen et al., Nature 442, 436 (2006). [4] R. C. Myers et al., Nature Materials 7, 203 (2008). [5] K. Yang et al., Phys. Rev. Lett. 119, 227206 (2017). [6] R. E. George et al., Phys. Rev. Lett. 110, 027601 (2013).

Conference Presentation

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Stephen McMillan, Nicholas J. Harmon, and Michael E. Flatté "Proposal for measurement of coherent spin dynamics of individual magnetic dopants in a semiconductor using low-field magnetoresistance of spin-polarized scanning tunneling spectroscopy (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107322Z (18 September 2018); https://doi.org/10.1117/12.2322503

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KEYWORDS

Magnetism

Scanning tunneling microscopy

Spin dynamics

Group III-V semiconductors

Magnetic semiconductors

Semiconductors

Spectroscopy

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