Title: Magnetoconductance Oscillations in Graphene p-n Junctions
Speaker: Prof. Ming-Hao Liu (Department of Physics, National Cheng Kung University)
               劉明豪助理教授 (國立成功大學物理學系)
Time: 3:30 PM, April 12 (Thursday), 2018
Place: Dr. Poe Lecture Hall, IAMS (本所浦大邦講堂　臺大校園內)
Contact: Dr. Charles Lai 賴品光博士

 

Conductance of graphene pn junctions may oscillate with various dependencies, such as carrier density, magnetic field, or even the position of the pn junction. In this talk, various mechanisms giving rise to the oscillation are discussed, including Fabry-Perot interference, snake states, and valley-isospin. Recent experiments revealing these mechanisms are supported by our quantum transport simulations based on tight-binding models [1], which allow for not only gate- and field-dependent conductance calculations but also real-space imaging of local current densities. Keys to such quantum transport simulations [2] will also be briefly introduced.

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 [1] P. Rickhaus et al., Nat. Communs. 4, 2342 (2013); P. Rickhaus et al., Nat. Communs. 6, 6470 (2015); C. Handschin et al., Nano Lett. 17, 5389 (2017).
 [2] M.-H. Liu et al., Phys. Rev. Lett. 114, 036601 (2015); M.-H. Liu, J. Comput. Electron. 12 , 188 (2013).