Details

Autor(en) / Beteiligte

• Wang, Zi-Han
• Yoon, Cheul-Hyun
• Yoshida, Shoji
• Arashida, Yusuke
• Takeuchi, Osamu
• Ohno, Yuzo
• Shigekawa, Hidemi

Titel

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

Ist Teil von

• Physical chemistry chemical physics : PCCP, 2019, Vol.21 (14), p.7256-7260

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.