Probing phonon emission via hot carrier transport in suspended graphitic multilayers

We study hot carrier transport under magnetic fields up to 15 T in suspended graphitic multilayers through differential conductance ( d I / d V ) spectroscopy. Distinct high-energy d I / d V anomalies have been observed and shown to be related to intrinsic phonon-emission processes in graphite. The evolution of such d I / d V anomalies under magnetic fields is further understood as a consequence of inter-Landau level cyclotron–phonon resonance scattering. The observed magneto-phonon effects not only shed light on the physical mechanisms responsible for high-current transport in graphitic systems, but also offer new perspectives for optimizing performance in graphitic nano-electronic devices.