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Contact: Paul Preuss
paul_preuss@lbl.gov
510-486-6249
DOE/Lawrence Berkeley National Laboratory
Caption: These STM electron tunneling spectra were obtained at the same physical location on a graphene surface held at different gate voltages. The vertical scale gives a measure of the energy-dependent graphene electron density of states; the different curves result from the different applied gate voltages. Changing the gate voltage allows the density of charge carriers in the graphene to be controllably varied. The red arrows indicate the measured tunnel current signal that occurs when electrons tunnel from the STM tip to the graphene Dirac point, a minimum in the graphene density of states.
Credit: Lawrence Berkeley National Laboratory
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