Journal
PHYSICAL REVIEW B
Volume 86, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.045431
Keywords
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Funding
- Ministry of Education, Science, Sports and Culture of Japan [21540265]
- Grants-in-Aid for Scientific Research [24540270, 21540265] Funding Source: KAKEN
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In a magnetic field, bilayer graphene supports an octet of zero-energy Landau levels with an extra twofold degeneracy in Landau orbitals n = 0 and 1. It is shown that this orbital degeneracy is lifted due to Coulombic quantum fluctuations of the valence band (the Dirac sea); this is a quantum effect analogous to the Lamb shift in the hydrogen atom. A detailed study is made of how these zero-energy levels evolve, with filling, into a variety of pseudo-zero-mode Landau levels in the presence of possible spin and valley breaking and Coulomb interactions, and a comparison is made with experimental results.
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