Condensed Matter Seminar: "Spin and Charge Transport in Few-Layer Atomic Membranes"

Speaker Jeanie Lau, The Ohio State University
Date: 4/14/2017
Time: 1 p.m.

ESB 190


Physics - Condensed Matter

Event Type: Seminar/Symposium

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. Using quantum Hall effects in graphene as injectors, filters and detectors, we observe robust long distance spin transport through the antiferromagnetic state in graphene. 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. At even higher magnetic fields, the crystal symmetry is broken in by electron-electron interactions and the nu=0 quantum Hall state develops an insulating phase. 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 quantum Hall effect in air-stable, few-layer phosphorene devices. Our results underscore the fascinating band structures and many-body physics in these 2D membranes.

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