Exploring room temperature spin transport under band gap opening in bilayer graphene

The spin signal, \(\Delta R_{nl}\), measured along the Dirac ridge (\(n\sim 0\)) at RT, shows a decrease with increasing displacement field (Fig. 5c), with a modulation of approximately half.

To understand the role of the applied displacement field, D, we measured a series of maps of local resistance versus n and D from 20 K up to RT. This enables the study of thermal excitation of carriers for a given D, with a fixed \(n\approx 0\). Arrhenius analysis^16,23,24 of these measurements yielded the value of the band gap in the encapsulated BLG channel, exhibiting band gap values of up to