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Chaojing Lin

Chaojing Lin

PD Researcher, Department of Physics, Tokyo Institute of Technology

host researcher:
C01 Toshimasa Fujisawa
Term:
2016/10/01- (Research Group PD)

E-mail : lin.c.ad[at]m.titech.ac.jp

RESEARCH

The fractional quantum hall (FQH) effect shown plateaus at fractional quantum conductivity can be realized by applying a high magnetic field to a high mobility two-dimensional electron gas in GaAs/AlGaAs heterostructures, which has been well known as a topological state induced by the strong electron-electron interactions for almost 30 years, but it still continuously contributes new concepts and phenomena to nowadays condensed matter physics since to this state the understandings are still insufficient.

A new kind of low-energy collective excitation with only carrying energy but no net charges, named as neutral mode was recently revealed in FQH edge states by shot-noise measurements [1]. As the general transport method failed in detecting this mode, little knowledge has been known to its basic properties like the dispersion relation and dynamic responses. What I will focus is to reveal these properties for neutral modes by extending the electrical pump-probe scheme, a high frequency technique which has been successfully developed in researches on integer quantum hall edge state [2] in Fujisawa Lab in Tokyo Institute of Technology, to the FQH regime, as well as in combination with some spectroscopic techniques into the experiments. Since the neutral mode is a result of edge reconstructions due to the interactions and disorders, therefore these
experiments should shed a new light on understanding the FQH edge structures, furthermore the knowledge we gained, which itself would also contribute to our understandings to the FQH effect.

The research on FQH effect is an extension to my previous work on topological systems during my Ph.D studies. I am grateful to the chance provided by Prof. T. Fujisawa (Tokyo Institute of Technology) to me to participate in the Topological Material Science project, where I have already enjoyed the researches!

[1] A. Bid et al., Nature 466, 585 (2010).
[2] H. Kamata et al., Nature Nanotech. 9, 177 (2014).

EDUCATION

2016
Ph.D from Institute of Physics, Chinese Academy of Sciences

PROFESSIONAL EXPERIENCE

2016
PD Researcher, Department of Physics, Tokyo Institute of Technology

SELECTION OF PUBLICATIONS

"Generation and detection of edge magnetoplasmons in a quantum Hall system using a photoconductive switch"
C. J. Lin, K. Morita, K. Muraki, and T. Fujisawa,
Japanese Journal of Applied Physics 57, 04FK02-1-4 (Feb. 2018).
https://doi.org/10.7567/JJAP.57.04FK02

"Spin fluctuations and colossal magnetoresistance in HgCr2Se4"
C. J. Lin, C. J. Yi, Y. G. Shi, L. Zhang, G. M. Zhang, J. Muller, Y. Q. Li,
Physical Review B 94, 224404-1-11 (Dec. 2016).
DOI: 10.1103/PhysRevB.94.224404

"Parallel field magnetoresistance in topological insulator thin films"
C. J. Lin, X. Y. He, J. Liao, X. X. Wang, V. Sacksteder IV, W. M. Yang, T. Guan, Q. M. Zhang, L. Gu, G. Y. Zhang, C. G. Zeng, X. Dai, K. H. Wu, Y. Q. Li,
Physical Review B 88, 041307(R)-1-6 (Jul. 2013).
DOI: 10.1103/PhysRevB.88.041307