Effect of charged impurity correlations on transport in monolayer and bilayer graphene |
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| Authors: | Qiuzi Li E.H. Hwang E. Rossi |
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| Affiliation: | 1. Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742, United States;2. Department of Physics, College of William and Mary, Williamsburg, VA 23187, USA;1. ICMM, CISC, Instituto de Ciencia de Materiales de Madrid, Sor Juana Ines de la Cruz 3, Cantoblanco, Madrid, 28049, Spain;2. Department of Mechanical Engineering, University of Texas, 1 University Station, C2200, Austin, TX 78712-0292, Texas, USA;3. Solid State Physics Laboratory, Eidgenössische Technische Hochschule Zürich, Zürich, CH 8093, Switzerland;4. Department of Physics, Columbia University, 550 W 120th Street, New York, NY 10027, New York, USA;1. College of Chemistry, Beijing Normal University, Beijing, 100875, China;2. Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China;3. College of Physical and Optoelectronic Engineering, Ocean University of China;4. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;1. Department of Physics, University of Seoul, Seoul 130-743, Republic of Korea;2. Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), 77 Cheongam-Ro, Pohang 790-784, Republic of Korea;3. Department of Physics, Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Republic of Korea |
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| Abstract: | We study both monolayer and bilayer graphene transport properties taking into account the presence of correlations in the spatial distribution of charged impurities. In particular we find that the experimentally observed sublinear scaling of the graphene conductivity can be naturally explained as arising from impurity correlation effects in the Coulomb disorder, with no need to assume the presence of short-range scattering centers in addition to charged impurities. We find that also in bilayer graphene, correlations among impurities induce a crossover of the scaling of the conductivity at higher carrier densities. We show that in the presence of correlation among charged impurities the conductivity depends nonlinearly on the impurity density ni and can increase with ni. |
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