Spin manipulation in graphene by chemically induced pseudospin polarization
Dinh, Van Tuan (Institut Català de Nanociència i Nanotecnologia)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Data:	2016
Resum:	Spin manipulation is one of the most critical challenges to realize spin-based logic devices and spintronic circuits. Graphene has been heralded as an ideal material to achieve spin manipulation, but so far new paradigms and demonstrators are limited. Here we show that certain impurities such as fluorine adatoms, which locally break sublattice symmetry without the formation of strong magnetic moment, could result in a remarkable variability of spin transport characteristics. The impurity resonance level is found to be associated with a long-range sublattice pseudospin polarization, which by locally decoupling spin and pseudospin dynamics provokes a huge spin lifetime electron-hole asymmetry. In the dilute impurity limit, spin lifetimes could be tuned electrostatically from 100 ps to several nanoseconds, providing a protocol to chemically engineer an unprecedented spin device functionality.
Ajuts:	European Commission 604391 Ministerio de Economía y Competitividad MAT2012-33911 Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Critical challenges ; Electron-hole asymmetry ; Impurity resonances ; Spin lifetimes ; Spin manipulation ; Spin transport ; Spintronic circuits ; Sublattice symmetry
Publicat a:	Physical review letters, Vol. 116, Issue 10 (March 2016) , art. 106601, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.116.106601

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