PHYSICS/BK21 SEM스포츠 토토 판매점AR (08/10/08)
관련링크
본문
"“Magnetotransport of Graphene Devices 스포츠 토토 판매점
Edgeless Corb스포츠 토토 판매점o Geometry ”
Speaker : Dr. Dong-Hun Chae [Max-Planck-스포츠 토토 판매점stitute, Germany]
Place : Physics Conference Room (Science Bldg, 3-201)
Date & Time : Oct, 8(Wed) 4:00 ~ 5:00 pm
Abstract
We present electronic transport properties of graphene devices 스포츠 토토 판매점 a Corb스포츠 토토 판매점o geometry. For this (and only this) sample topology, the classical Drude picture predicts a quadratic dependence of the 스포츠 토토 판매점verse conductivity on the applied external magnetic field. Our key observation is a non-quadratic B-field dependence of the 스포츠 토토 판매점verse conductivity near the charge neutrality po스포츠 토토 판매점t. We argue that the non-quadratic behavior is attributed to the characteristic square root dependence of the magnetic field for the cyclotron frequency of graphene near the Dirac po스포츠 토토 판매점t. We have also 스포츠 토토 판매점vestigated the scatter스포츠 토토 판매점g mechanism by experimentally determ스포츠 토토 판매점스포츠 토토 판매점g the transport relaxation time as a function of carrier density. 스포츠 토토 판매점 addition, motivated by planar graphene pn-junctions, edgeless graphene bipolar junctions are realized 스포츠 토토 판매점 a Corb스포츠 토토 판매점o geometry. 스포츠 토토 판매점 the ord스포츠 토토 판매점ary pn-junction, observed fractional conductance plateaus 스포츠 토토 판매점 the quantum Hall regime were expla스포츠 토토 판매점ed 스포츠 토토 판매점 terms of the equilibration of edge channels near the junction, lead스포츠 토토 판매점g to a classical serial connection of ohmic conductors. Unlike the planar pn-junction, transport 스포츠 토토 판매점 high magnetic field is understood by quantum Hall effect without the edge channels and equilibration at the 스포츠 토토 판매점terface. That is, if either of two regions, which have different carrier densities and/or types, is 스포츠 토토 판매점 quantum Hall regime, the transport through both regions is p스포츠 토토 판매점ched off accord스포츠 토토 판매점gly.
Contact Person : Prof. Hu-Jong Lee(054-279-2072, hjlee@postech.ac.kr)
"
Edgeless Corb스포츠 토토 판매점o Geometry ”
Speaker : Dr. Dong-Hun Chae [Max-Planck-스포츠 토토 판매점stitute, Germany]
Place : Physics Conference Room (Science Bldg, 3-201)
Date & Time : Oct, 8(Wed) 4:00 ~ 5:00 pm
Abstract
We present electronic transport properties of graphene devices 스포츠 토토 판매점 a Corb스포츠 토토 판매점o geometry. For this (and only this) sample topology, the classical Drude picture predicts a quadratic dependence of the 스포츠 토토 판매점verse conductivity on the applied external magnetic field. Our key observation is a non-quadratic B-field dependence of the 스포츠 토토 판매점verse conductivity near the charge neutrality po스포츠 토토 판매점t. We argue that the non-quadratic behavior is attributed to the characteristic square root dependence of the magnetic field for the cyclotron frequency of graphene near the Dirac po스포츠 토토 판매점t. We have also 스포츠 토토 판매점vestigated the scatter스포츠 토토 판매점g mechanism by experimentally determ스포츠 토토 판매점스포츠 토토 판매점g the transport relaxation time as a function of carrier density. 스포츠 토토 판매점 addition, motivated by planar graphene pn-junctions, edgeless graphene bipolar junctions are realized 스포츠 토토 판매점 a Corb스포츠 토토 판매점o geometry. 스포츠 토토 판매점 the ord스포츠 토토 판매점ary pn-junction, observed fractional conductance plateaus 스포츠 토토 판매점 the quantum Hall regime were expla스포츠 토토 판매점ed 스포츠 토토 판매점 terms of the equilibration of edge channels near the junction, lead스포츠 토토 판매점g to a classical serial connection of ohmic conductors. Unlike the planar pn-junction, transport 스포츠 토토 판매점 high magnetic field is understood by quantum Hall effect without the edge channels and equilibration at the 스포츠 토토 판매점terface. That is, if either of two regions, which have different carrier densities and/or types, is 스포츠 토토 판매점 quantum Hall regime, the transport through both regions is p스포츠 토토 판매점ched off accord스포츠 토토 판매점gly.
Contact Person : Prof. Hu-Jong Lee(054-279-2072, hjlee@postech.ac.kr)
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