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Surface-mediated spin dynamics probed by optical-pump–probe scanning tunneling microscopy

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Abstract

In current materials science and technologies, surface effects on carrier and spin dynamics in functional materials and devices are of great importance. In this paper, we present the surface-sensitive probing of electron spin dynamics, performed by optical-pump–probe scanning tunneling microscopy (OPP-STM). Time-resolved spin lifetime information on a manganese (Mn)-deposited GaAs(110) surface was successfully obtained for the first time. With increasing Mn density via in situ evaporation, a nonlinear change in the spin lifetime in the picosecond range was clearly observed, while directly confirming the Mn density by STM. In comparison with the results obtained by the conventional OPP method, we have also demonstrated that the observed nonlinear spin lifetime behavior was surface-mediated, which can be characterized using only the surface-sensitive OPP-STM technique.

Graphical abstract: Surface-mediated spin dynamics probed by optical-pump–probe scanning tunneling microscopy

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Publication details

The article was received on 21 Dec 2018, accepted on 28 Jan 2019 and first published on 28 Jan 2019


Article type: Communication
DOI: 10.1039/C8CP07786J
Citation: Phys. Chem. Chem. Phys., 2019, Advance Article

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    Surface-mediated spin dynamics probed by optical-pump–probe scanning tunneling microscopy

    Z. Wang, C. Yoon, S. Yoshida, Y. Arashida, O. Takeuchi, Y. Ohno and H. Shigekawa, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C8CP07786J

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