Monolayer graphene (MLG) provides a unique platform for investigating relativistic quantum phenomena due to its linear band dispersion for low energy excitations. In this talk, I will present our recent experimental results on electrostatically confined elliptical quantum dots (QDs) in MLG using scanning tunneling microscopy and spectroscopy at low temperature. Unlike in a circular QD, charge carriers display anisotropic behaviors along major and minor axes in an elliptical QD, which is revealed by dI/dV line scans and maps. Dirac and Schrödinger physics in such a system is analyzed theoretically and compared. These findings provide more insight into the nature of confined Dirac Fermions, which can be leveraged for novel nanoelectronic devices.
*This research is supported by the Gordon and Betty Moore Foundation, grant DOI #10.37807/GBMF11569 and National Science Foundation (Grant No. 2403491).
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Presenters
Tianhui Zhu
University of California, Santa Cruz
Authors
Tianhui Zhu
University of California, Santa Cruz
Qirong Yao
University of California, Santa Cruz
Anton Marius Graf
Harvard University
Xincong Liu
University of California, Santa Cruz
Annette Zoe Samuels Asryan
University of California, Santa Cruz
Yanzi Lin
University of California, Santa Cruz
Jucheng Lin
Shanghai Jiao Tong University
shanghai jiao tong university
Yicheng Zhuang
Peking Univ
Takashi Taniguchi
National Institute for Materials Science
Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
Kenji Watanabe
National Institute for Materials Science
Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
