The DOI matches its Crossref record; 30 of the 30 references it cites were found in a registry or an index.
Giant phonon-induced conductance in scanning tunnelling spectroscopy of gate-tunable graphene
Open accessAbstract
Scanning tunnelling spectra of a graphene field-effect transistor reveal an unexpected tenfold increase in conductance as a result of phonon-mediated inelastic tunnelling. The honeycomb lattice of graphene is a unique two-dimensional system where the quantum mechanics of electrons is equivalent to that of relativistic Dirac fermions1,2. Novel nanometre-scale behaviour in this material, including electronic scattering3,4, spin-based phenomena5 and collective excitations6, is predicted to be sensitive to charge-carrier density. To probe local, carrier-density-dependent properties in graphene, we have carried out atomically resolved scanning tunnelling spectroscopy measurements on mechanically cleaved graphene flake devices equipped with tunable back-gate electrodes. We observe an unexpected gap-like feature in the graphene tunnelling spectrum that remains pinned to the Fermi level (EF) regardless of graphene electron density. This gap is found to arise from a suppression of electronic tunnelling to graphene states near EF and a simultaneous giant enhancement of electronic tunnelling at higher energies due to a phonon-mediated inelastic channel. Phonons thus act as a ‘floodgate’ that controls the flow of tunnelling electrons in graphene. This work reveals important new tunnelling processes in gate-tunable graphitic layers.
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Citations
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Metadata
- Authors
- Zhang, Y., Brar, V. W., Wang, F., Girit, C., Yayon, Y., Panlasigui, M., Zettl, A., & Crommie, M. F.
- Venue
- Nature Physics
- Published
- 2008-07-20
- Volume
- 4
- Issue
- 8
- Pages
- 627-630
- ISSN
- 1745-2473 (ISSN-L)
- 1745-2481
- OpenAlex
- W2044502653
- Cited by
- 476
- References
- 30
- FWCI
- 15.66
- Type
- journal article
- Language
- en
- Open access
- bronze
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