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Journal of Nanoscience Letters 2014, 4: 30
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Research Article
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Anomalous Bloch-Siegert effect in graphene
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Upendra Kumar, Enamullah, Vipin Kumar, Girish S. Setlur
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Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
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Abstract |
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In an earlier work, we showed that graphene exhibits two types of Rabi oscillations, conventional and anomalous. The conventional oscillation occurs at a resonant frequency given by twice the particle-hole energy, and the anomalous oscillation occurs for frequencies much larger than the conventional frequency (far from resonance). The anomalous oscillation is peculiar to graphene, attributable to pseudospin. The simplest theory of Rabi oscillation ignores higher harmonic contributions (counter rotating terms). Upon inclusion of these terms one encounters the Bloch Siegert effect. The conventional Bloch Siegert effect is common to both graphene and two-level systems and manifests itself in two ways – as a shift in the resonance condition and also as a modification of the resonant (conventional) Rabi frequency. The anomalous Bloch Siegert effect is peculiar to graphene and involves only a modification of the value of the anomalous Rabi frequency but not the condition for anomalous resonance.
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Keywords |
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Graphene; Bloch-Siegert shift; Rabi oscillations
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