4.8 Article

Interaction-Induced Shift of the Cyclotron Resonance of Graphene Using Infrared Spectroscopy

期刊

PHYSICAL REVIEW LETTERS
卷 104, 期 6, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.067404

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资金

  1. DOE [DE-AIO2-04ER46133, DE-FG02-05ER46215, DE-FG02-07ER46451]
  2. NSF [DMR-03-52738, CHE-0117752, DMR-0654118]
  3. ONR [N000150610138]
  4. NYSTAR
  5. Keck Foundation
  6. Microsoft Project-Q
  7. SRC-NRI-MIND

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We report a study of the cyclotron resonance (CR) transitions to and from the unusual n = 0 Landau level (LL) in monolayer graphene. Unexpectedly, we find the CR transition energy exhibits large (up to 10%) and nonmonotonic shifts as a function of the LL filling factor, with the energy being largest at half filling of the n = 0 level. The magnitude of these shifts, and their magnetic field dependence, suggests that an interaction-enhanced energy gap opens in the n 0 level at high magnetic fields. Such interaction effects normally have a limited impact on the CR due to Kohn's theorem [W. Kohn, Phys. Rev. 123, 1242 (1961)], which does not apply in graphene as a consequence of the underlying linear band structure.

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