Observation of magnetophonon resonance of Dirac fermions in graphite |
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Authors: | Yan Jun Goler Sarah Rhone Trevor D Han Melinda He Rui Kim Philip Pellegrini Vittorio Pinczuk Aron |
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Institution: | Department of Physics, Columbia University, New York, New York 10027, USA. |
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Abstract: | Coherent coupling of Dirac fermion magnetoexcitons with an optical phonon is observed in graphite as marked magnetic-field dependent splittings and anticrossing behavior of the two coupled modes. The sharp magnetophonon resonance occurs in regions of the graphite sample with properties of superior single-layer graphene having enhanced lifetimes of Dirac fermions. The greatly reduced carrier broadening to values below the graphene electron-phonon coupling constant explains the appearance of sharp resonances that reveal a fundamental interaction of Dirac fermions. |
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