Observation of Resistively Detected Hole Spin Resonance and Zero-field Pseudo-spin Splitting in Epitaxial Graphene

Ramesh G. Mani (1) , John Hankinson (2) , Claire Berger (3) , Walt A. de Heer

1 Department of Physics and Astronomy [Atlanta]
2 School of Physics [Atlanta]
3 NEEL - QuantECA - Circuits électroniques quantiques Alpes

Electronic carriers in graphene show a high carrier mobility at room temperature. Thus, this system is widely viewed as a potential future charge-based high-speed electronic-material to complement- or replace- silicon. At the same time, the spin properties of graphene have suggested improved capability for spin-based electronics or spintronics, and spin-based quantum computing. As a result, the detection, characterization, and transport of spin have become topics of interest in graphene. Here we report a microwave photo-excited transport study of monolayer and trilayer graphene that reveals an unexpectedly strong microwave-induced electrical-response and dual microwave-induced resonances in the dc-resistance. The results suggest the resistive detection of spin resonance, and provide a measurement of the g-factor, the spin relaxation time, and the sub-lattice degeneracy-splitting at zero-magnetic-field.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Ramesh G. Mani, John Hankinson, Claire Berger, Walt A. de Heer. Observation of Resistively Detected Hole Spin Resonance and Zero-field Pseudo-spin Splitting in Epitaxial Graphene. Nature Communications, 2012, 3, pp.996. ⟨10.1038/ncomms1986⟩. ⟨hal-00911218⟩