Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 10: Graphene: Spin-orbit interaction (HL, jointly with O, TT)

HL 10.2: Vortrag

Montag, 11. März 2013, 11:45–12:00, H17

D’yakonov-Perel’ spin dephasing in single and bilayer graphene and the role of contact resistance on the spin dephasing time — Frank Volmer^1,2, Marc Drögeler^1,2, Eva Maynicke^1,2, •Nils von den Driesch^1,2, Tsung-Yeh Yang^1,2, Gernot Güntherodt^1,2, and Bernd Beschoten^1,2 — ¹II. Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany — ²JARA: Fundamentals of Future Information Technology, 52074 Aachen, Germany

We investigate spin transport in both single and bilayer graphene non-local spin-valve devices. Similar to our previous studies on bilayer graphene [1], we observe an inverse dependence of the spin dephasing time on the carrier mobility in our single layer devices indicating the importance of D’yakonov-Perel’ like spin dephasing in exfoliated single and bilayer samples.

This general trend is only observed in devices with large contact resistances (>1 kΩ). In contrast, the spin dephasing time is significantly reduced in samples with low ohmic contacts for both single and bilayer graphene indicating that an additional spin dephasing occurs underneath the spin injection and detection electrodes.

This work has been supported by DFG through FOR 912.

[1] T.-Y. Yang et al. Phys. Rev. Lett. 107, 047206 (2011)