Interaction-driven quantum Hall wedding cake-like structures in graphene quantum dots.

Autor: Gutiérrez C; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.; Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA., Walkup D; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.; Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA., Ghahari F; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.; Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA., Lewandowski C; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA., Rodriguez-Nieva JF; Department of Physics, Harvard University, Cambridge, MA 02138, USA., Watanabe K; National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan., Taniguchi T; National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan., Levitov LS; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA., Zhitenev NB; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Stroscio JA; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. joseph.stroscio@nist.gov.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2018 Aug 24; Vol. 361 (6404), pp. 789-794.
DOI: 10.1126/science.aar2014
Abstrakt: Quantum-relativistic matter is ubiquitous in nature; however, it is notoriously difficult to probe. The ease with which external electric and magnetic fields can be introduced in graphene opens a door to creating a tabletop prototype of strongly confined relativistic matter. Here, through a detailed spectroscopic mapping, we directly visualize the interplay between spatial and magnetic confinement in a circular graphene resonator as atomic-like shell states condense into Landau levels. We directly observe the development of a "wedding cake"-like structure of concentric regions of compressible-incompressible quantum Hall states, a signature of electron interactions in the system. Solid-state experiments can, therefore, yield insights into the behavior of quantum-relativistic matter under extreme conditions.
(Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
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