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SUMMARY:Spin Transport in 2D Materials and Topological Matter - Prof. Step
 han Roche\, Catalan Institute of Nanoscience and Nanotechnology
DTSTART:20191017T131500Z
DTEND:20191017T141500Z
UID:TALK122044@talks.cam.ac.uk
CONTACT:Bartomeu Monserrat
DESCRIPTION:The physics of graphene can be strongly enriched and manipulat
 ed by harvesting the large amount of possibilities of proximity effects wi
 th magnetic insulators (including 2D magnetic layers) and strong SOC mater
 ials (TMDC\, topological insulators\, etc). Simultaneously\, the presence 
 of extra degrees of freedom (sublattice pseudospin\, valley isospin) point
 s towards new directions for information processing [1\,2]\, extending the
  playground to valleytronics\, multifunctional electronic devices or novel
  quantum computing paradigms harnessing all these degrees of freedom in co
 mbination with electromagnetic fields or other external fields (strain\, c
 hemical functionalization) [3\,4].  \n\nHere I will present some foundatio
 ns of spin transport for Dirac fermions propagating in supported graphene 
 devices or interfaced with strong SOC materials. The role of entanglement 
 with “valley and sublattice pseudospins” in tailoring the spin dephasi
 ng and relaxation mechanisms will be explained as well as the impact of st
 rong SOC proximity effects on spin lifetime anisotropy\, weak antilocaliza
 tion and Spin Hall effect [4-7]. Recent results showing universal spin dif
 ussion length in polycrystalline Graphene and nonlocal resistance transpro
 t phenomena in the crossover from ballistic to diffusive regimes will be a
 lso introduced [8]\n\n[1] S. Roche et al. 2D Materials 2\, 030202 (2015)\n
 [2] D.V. Tuan et al. Nature Physics 10\, 857 (2014)\n[3] D.V. Tuan & S. Ro
 che\, Phys. Rev. Lett 116\, 106601 (2016)\n[4] A.W. Cummings\, J. H. Garc
 ía\, J. Fabian and S. Roche\, Phys. Rev. Lett. 119\, 206601 (2016)\n[5] J
 .H. García\, A.W. Cummings\, S. Roche\, Nano Lett. 17 (8)\, 5078–5083 (
 2017).\n[6] K. Song et al. Nano letters 18 (3)\, 2033 (2018) \n[7] J.H. Ga
 rcía et al. Chem Soc. Rev 47\, 3359-3379 (2018)\; CK Safeer\, J Ingla-Ayn
 és\, F Herling\, JH Garcia\, M Vila\, N Ontoso\, et al. Nano letters 19 (
 2)\, 1074-1082 (2019)\; L. Benitez\, W. Torres\, J. Sierra\, M. Timmermans
 \, J. Garcia\, S. Roche\, et al. arXiv:1908.07868 (submitted to Nature Mat
 erials)\n[8] A.W. Cummings\, SMM Dubois\, J.C. Charlier\, S. Roche\, arXiv
 :1907.12761 (Nano Letters\, 10.1021/acs.nanolett.9b03112)\; M. Vila\, J. G
 arcia\, A.W. Cummings\, C. Groth\, X. Waintal and S. Roche (submitted to P
 hys. Rev. Lett.)\n\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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