| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Graphene is an eminent system of Dirac electrons and, when stacked to form a few layers, reveals even richer electronic characteristics. We explored a new many-body quantum effect in few-layer graphene and its consequences. In a magnetic field bilayer graphene supports eight zero-energy Landau levels with twofold orbital degeneracy. We pointed out that this orbital degeneracy is lifted by quantum fluctuations of the valence band (Dirac sea), leading to the "Lamb shift" as in the hydrogen atom. This "orbital" Lamb shift governs the structure of the lowest Landau level and is observable via the quantum Hall effect. For trilayers the presence of this effect makes them, depending on their stacking pattern, still richer in variety and in function.
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