TY - JOUR
T1 - Edge mixing dynamics in graphene p-n junctions in the quantum Hall regime
AU - Matsuo, Sadashige
AU - Takeshita, Shunpei
AU - Tanaka, Takahiro
AU - Nakaharai, Shu
AU - Tsukagoshi, Kazuhito
AU - Moriyama, Takahiro
AU - Ono, Teruo
AU - Kobayashi, Kensuke
N1 - Funding Information:
We thank Kensaku Chida for fruitful discussion on the planning of the experiment and Tomonori Arakawa for his important contribution for the noise measurement and analysis. This work was partially supported by a Grant-in-Aid for Scientific Research (S) (No. 26220711) from the Japan Society for the Promotion of Science, a Grant-in-Aid for Scientific Research on Innovative Areas ‘Fluctuation & Structure’ (No. 25103003) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, Yazaki Memorial Foundation for Science and Technology, Grant-in-Aid for Scientific Research on Innovative Areas ‘Science of Atomic Layers’ (No. 25107004) from MEXT, and the Collaborative Research Program of the Institute for Chemical Research, Kyoto University.
Publisher Copyright:
© 2015 Macmillan Publishers Limited. All rights reserved.
PY - 2015/9/4
Y1 - 2015/9/4
N2 - Massless Dirac electron systems such as graphene exhibit a distinct half-integer quantum Hall effect, and in the bipolar transport regime co-propagating edge states along the p-n junction are realized. Additionally, these edge states are uniformly mixed at the junction, which makes it a unique structure to partition electrons in these edge states. Although many experimental works have addressed this issue, the microscopic dynamics of electron partition in this peculiar structure remains unclear. Here we performed shot-noise measurements on the junction in the quantum Hall regime as well as at zero magnetic field. We found that, in sharp contrast with the zero-field case, the shot noise in the quantum Hall regime is finite in the bipolar regime, but is strongly suppressed in the unipolar regime. Our observation is consistent with the theoretical prediction and gives microscopic evidence that the edge states are uniquely mixed along the p-n junction.
AB - Massless Dirac electron systems such as graphene exhibit a distinct half-integer quantum Hall effect, and in the bipolar transport regime co-propagating edge states along the p-n junction are realized. Additionally, these edge states are uniformly mixed at the junction, which makes it a unique structure to partition electrons in these edge states. Although many experimental works have addressed this issue, the microscopic dynamics of electron partition in this peculiar structure remains unclear. Here we performed shot-noise measurements on the junction in the quantum Hall regime as well as at zero magnetic field. We found that, in sharp contrast with the zero-field case, the shot noise in the quantum Hall regime is finite in the bipolar regime, but is strongly suppressed in the unipolar regime. Our observation is consistent with the theoretical prediction and gives microscopic evidence that the edge states are uniquely mixed along the p-n junction.
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U2 - 10.1038/ncomms9066
DO - 10.1038/ncomms9066
M3 - Article
AN - SCOPUS:84940971090
VL - 6
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 8066
ER -