期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 9, 页码 3282-3286出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1300599110
关键词
Fermi velocity-renormalization; boron nitride; 2D based heterostructures
资金
- European Research Council
- European Commission Seventh Framework Programme
- Engineering and Physical Research Council (UK)
- Royal Society
- US Office of Naval Research
- US Air Force Office of Scientific Research
- US Army Research Office
- Korber Foundation
- EuroMagNET II under the European Union [228043]
Capacitance measurements provide a powerful means of probing the density of states. The technique has proved particularly successful in studying 2D electron systems, revealing a number of interesting many-body effects. Here, we use large-area high-quality graphene capacitors to study behavior of the density of states in this material in zero and high magnetic fields. Clear renormalization of the linear spectrum due to electron-electron interactions is observed in zero field. Quantizing fields lead to splitting of the spin- and valley-degenerate Landau levels into quartets separated by interaction-enhanced energy gaps. These many-body states exhibit negative compressibility but the compressibility returns to positive in ultrahigh B. The reentrant behavior is attributed to a competition between field-enhanced interactions and nascent fractional states.
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