An on/off Berry phase switch in circular graphene resonators
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1705.11117.pdf
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Author(s)
Ghahari, Fereshte
Walkup, Daniel
Gutiérrez, Christopher
Rodriguez Nieva, Joaquin Francisco
Zhao, Yue
Wyrick, Jonathan
Natterer, Fabian D.
Cullen, William G.
Watanabe, Kenji
Taniguchi, Takashi
Date Issued
May 2017
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Ghahari, Fereshte et al. “An On/off Berry Phase Switch in Circular Graphene Resonators.” Science 356, 6340 (May 2017): 845–849 © 2016 American Association for the Advancement of Science
Version
Author's final manuscript
Abstract
The phase of a quantum state may not return to its original value after the system's parameters cycle around a closed path; instead, the wave function may acquire a measurable phase difference called the Berry phase. Berry phases typically have been accessed through interference experiments. Here, we demonstrate an unusual Berry phase-induced spectroscopic feature: a sudden and large increase in the energy of angular-momentum states in circular graphene p-n junction resonators when a relatively small critical magnetic field is reached. This behavior results fromturning on a π Berry phase associated with the topological properties of Dirac fermions in graphene. The Berry phase can be switched on and off with small magnetic field changes on the order of 10 millitesla, potentially enabling a variety of optoelectronic graphene device applications.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1126/SCIENCE.AAL0212
