Quantum Transport and Electron Interactions in Few-Layer Atomic Membranes
Two dimensional materials constitute an exciting and unusually tunable platform for investigation of both fundamental phenomena and electronic applications. Here I will present our results on transport measurements on high mobility few-layer graphene and phosphorene devices. In bilayer and trilayer graphene devices with mobility as high as 400,000 cm2/V, we observe intrinsic gapped states at the charge neutrality point, arising from electronic interactions. This state is identified to be a layer antiferromagnetic state with broken time reversal symmetry. In another few-layer graphene system, ABA-stacked trilayer graphene consists of multiple Dirac bands, where crystal symmetry protects the spin degenerate counter-propagating edge modes resulting in σxx = 4e2/h and 2e2/h. Our findings indicate the role of crystal and spin symmetry in generation of topological phases in multiple Dirac bands. Finally, I will present our recent results on weak localization and quantum Hall effect in air-stable, few-layer phosphorene devices. Our results underscore the fascinating many-body physics in these 2D membranes.
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Chun Ning (Jeanie) Lau is well known for her discoveries of novel physics and phenomena of nanoscale systems, in particular, graphene and other two-dimensional materials. Her research on the electronic, thermal, and mechanical properties of nanoscale systems brings new expertise to the Ohio State materials community that will advance the M&MS goal of developing faster information processing technologies with lower energy consumption. Prior to joining Ohio State, Lau was a Professor in the Department of Physics and Astronomy at University of California, Riverside. She has published more than 80 papers, given more than 100 invited talks worldwide, and was the recipient of the NSF CAREER award and the Presidential Early Career Award for Scientists and Engineers (PECASE) award.