Inverse Spin Hall Voltage in Organic Semiconductors with Tunable Spin-Orbit Coupling

ORAL

Abstract

Spin-current in organic semiconductors that are generated via the process of `spin-pumping' from FM substrates subjected to resonant microwave absorption has attracted recently great interest, since this scheme circumvents the impedance mismatch that exists in the ``spin injection'' technique between the organic semiconductors and FM injector. Because of the weak spin-orbit coupling (SOC) in most organic semiconductors (OSECs), the obtained inverse spin Hall effect (ISHE) in these materials is very subtle. In this work we measured ISHE in a variety of OSECs having tunable SOC ranging from strong SOC (pi-conjugated polymers that contain intrachain Pt atoms) to weak SOC polymers (such as DOO-PPV). We found that the ISHE response in these compounds increases with the SOC, in spite of the decrease in the spin diffusion length.

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Authors

  • Dali Sun

    • Department of Physics \& Astronomy, University of Utah, Salt Lake City, UT, 84112, USA

  • Kipp van Schooten

    • Department of Physics \& Astronomy, University of Utah, Salt Lake City, UT, 84112, USA

  • Hans Malissa

    • Department of Physics \& Astronomy, University of Utah, Salt Lake City, UT, 84112, USA

  • Marzieh Kavand

    • Department of Physics \& Astronomy, University of Utah, Salt Lake City, UT, 84112, USA

  • Chuang Zhang

    • Department of Physics \& Astronomy, University of Utah, Salt Lake City, UT, 84112, USA

  • Christoph Boehme

    • Department of Physics \& Astronomy, University of Utah, Salt Lake City, UT, 84112, USA

  • Z. Valy Vardeny

    • Department of Physics \& Astronomy, University of Utah, Salt Lake City, UT, 84112, USA