An on/off Berry phase switch in circular graphene resonators-Reference-Cited by-同舟云学术

An on/off Berry phase switch in circular graphene resonators

Published:2017-05-26 Issue:6340 Volume:356 Page:845-849
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Ghahari Fereshte¹²^ORCID,Walkup Daniel¹²^ORCID,Gutiérrez Christopher¹²^ORCID,Rodriguez-Nieva Joaquin F.³⁴^ORCID,Zhao Yue¹²⁵,Wyrick Jonathan¹^ORCID,Natterer Fabian D.¹⁶^ORCID,Cullen William G.¹^ORCID,Watanabe Kenji⁷^ORCID,Taniguchi Takashi⁷,Levitov Leonid S.³,Zhitenev Nikolai B.¹^ORCID,Stroscio Joseph A.¹^ORCID

Affiliation:

1. Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

2. Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA.

3. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

4. Department of Physics, Harvard University, Cambridge, MA 02138, USA.

5. Department of Physics, South University of Science and Technology of China, Shenzhen, China.

6. Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.

7. National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.

Abstract

Flicking the Berry phase switch When an electron completes a cycle around the Dirac point (a particular location in graphene's electronic structure), the phase of its wave function changes by π. This so-called Berry phase is tricky to observe directly in solid-state measurements. Ghahari et al. built a graphene nanostructure consisting of a central region doped with positive carriers surrounded by a negatively doped background. Scanning tunneling spectroscopy revealed sudden jumps in conductivity as the external magnetic field was increased past a threshold value. The jumps occurred when electron orbits started encompassing the Dirac point, reflecting the switch of the Berry phase from zero to π. The tunability of conductivity by such minute changes in magnetic field is promising for future applications. Science , this issue p. 845

Funder

National Science Foundation

U.S. Army Research Laboratory

Swiss National Science Foundation

National Science Foundation of China

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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