Abstract: Since the isolation of graphene, the first two-dimensional material, it has garnered significant research attention owing to its extraordinary properties, such as an extremely high carrier mobility. High carrier mobility is crucial for devices requiring high switching speeds and low power dissipation, and this is made possible by graphene's massless dispersion spectrum around the Fermi energy. Around graphene's Dirac point, magnetoresistance is closely linked to its mobility and shows promise for significant intrinsic magnetoresistance (MR). In this presentation, Dr. Lourembam will discuss their latest research on giant MR around graphene's Dirac point. The findings reveal a substantial quadratic MR, exceeding 100% at room temperature (RT) in magnetic fields as low as 0.1T. This value is orders of magnitude larger than any other known system at RT. As Landau quantization comes into play with increasing magnetic field strength, a giant linear MR emerges, reaching approximately 13,000% at RT in a 12T magnetic field.

References: 1N. Xin†, J. Lourembam†, P. Kumaravadivel† et al., (2023) " Strange magnetoresistance of high-mobility Dirac plasma" (Nature, 616,270-274 https://doi.org/10.1038/s41586-023-05807-0) †equal contribution

Meeting ID: 969 5760 7087
Passcode: 590948