The University of Utah
Department of Physics & Astronomy at the University of Utah

This Week's Colloquium: Christoph Boehme, Aug 30, 2012

Christoph Boehme
University of Utah

Thursday, Aug 30, 2012
102 JFB

Refreshments: 3:30 pm in 219 JFB
Lecture 4:00pm (102 JFB)

Title: Spintronics of weakly spin-orbit coupled semiconductors


While the term "Spintronics" was originally introduced as label for technologies that represent information through spin states rather than charge states, it is nowadays oftentimes used solely in the context of spin-polarization, spin-injection, spin-transport and spin-orbit effects. Silicon and carbon based semiconductors display only weak spin-orbit coupling and - in the case of organic semiconductors - charge transport via hopping through strongly localized states. These materials appear at first glance therefore to be entirely unsuitable for spintronics. However, they also exhibit spin related effects not seen in materials with strong spin-orbit coupling which can be used for an alternative, radically different approach to spintronics which is based on spin-permutation symmetry states of charge carrier pairs rather than spin-polarization states. Reading spin-permutation symmetry is straight forward when pronounced spin-selection rules exist. In contrast to spin-polarization, permutation symmetry does not depend directly on temperature and magnetic field strength. Furthermore, the absence of spin-orbit coupling can also allow for long spin-coherence times and thus, the possibility to connect spintronics to an all spin based memory which could be important for spin-based quantum information concepts. While spin-orbit coupling is needed in traditional spintronics for electric field controlled spin-manipulation, low-spin-orbit coupled devices may achieve the same via electric field controlled spin-exchange interaction. In this talk, our work on the development of this alternative organic spintronics concept will be presented and the state of its experimental implementation will be discussed

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