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						<h1 itemprop="headline">Solid State Physics Seminar - Daniel Wegner: Spin-Orbit Coupling on Surfaces and in Molecules: from Rashba to OLEDs to Molecular Magnets</h1>
						
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														Thursday 12  June 2014,
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														&nbsp;at 11:15 -  12:15
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														Philip Hofmann
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									<p><strong>Speaker:</strong> Daniel Wegner, Institute for Molecules and Materials, Radboud University Nijmegen, the Nederlands
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<p><strong>Title</strong>: Spin-Orbit Coupling on Surfaces and in Molecules:&nbsp;from Rashba to OLEDs to Molecular Magnets
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<p><strong>Abstract</strong>:
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<p>I will present an overview of our recent STM/STS activities on systems where spin-orbit coupling plays an important role:
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<p>&nbsp;1. The well-known Bi/Cu(111)&nbsp;surface alloy&nbsp;exhibits several Rashba-split surface states. Through spectroscopic mapping of electronic standing waves, various intra- and interband scattering channels can be detected. A simultaneous analysis permits a full recovery of the surface band structure including the Rashba splitting [1]. In the unoccupied region, we find deviations from a simple picture of allowed and forbidden scattering channels.
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<p>&nbsp;2. State-of-the-art OLED devices are based on phosphorescent molecules ("triplet emitters"). The strong spin-orbit coupling of these&nbsp;heavy-metal complexes can reach light-conversion efficiencies up to 100% compared to only 25% for purely organic fluorescent molecules. I will present STM and STS results of a new class of square-planar Pt-based triplet emitters that show interesting modified properties at the organic-metal interface that may allow for new, dramatically simplified OLED architectures [2].
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<p>&nbsp;3. I will present our strategy and first results of synthesizing single-molecule magnets (SMMs) on surfaces in an atom-by-atom fashion via STM manipulation. Utilizing molecule-substrate coupling as well as organic-metal bonding, we can tune the molecular conformation of the octagonal carbon ring cyclooctatetraene [3]. This molecule is a building block for rare-earth metallocene-type molecular magnets, and our results pave a route toward building them in a bottom-up fashion.
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<p>&nbsp;References:
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<p>[1]&nbsp;&nbsp; M. Steinbrecher&nbsp;et al., Phys. Rev. B 87, 245436 (2013).
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<p>[2]&nbsp;&nbsp; P. R. Ewen&nbsp;et al., Phys. Rev. Lett. 111, 267401 (2013).
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<p>[3] &nbsp; H. Harutyunyan&nbsp;et al., Chem. Commun. 49, 5993 (2013).
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<p><strong>Host:</strong>&nbsp;Professor Philip Hofmann, iNANO &amp; Department of Physics and Astronomy</p>
								
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