Multiphoton absorption and Rabi oscillations in armchair graphene
nanoribbons
- URL: http://arxiv.org/abs/2201.03896v1
- Date: Tue, 11 Jan 2022 11:48:24 GMT
- Title: Multiphoton absorption and Rabi oscillations in armchair graphene
nanoribbons
- Authors: B.S. Monozon and P. Schmelcher
- Abstract summary: We present an analytical approach to the problem of the multiphoton absorption and Rabi oscillations in an armchair graphene nanoribbon.
We trace the dependencies on the ribbon width and electric field strength for both the multiphoton assisted and tunneling regimes.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We present an analytical approach to the problem of the multiphoton
absorption and Rabi oscillations in an armchair graphene nanoribbon (AGNR) in
the presence of a time-oscillating strong electric field induced by a light
wave directed parallel to the ribbon axis. The two-dimensional Dirac equation
for the massless electron subject to the ribbon confinement is employed. In the
resonant approximation the electron-hole pair production rate, associated with
the electron transitions between the valence and conduction size-quantized
subbands, the corresponding multiphoton absorption coefficient and the
frequency of the Rabi oscillations are obtained in an explicit form. We trace
the dependencies of the above quantities on the ribbon width and electric field
strength for both the multiphoton assisted and tunneling regimes relevant to
the time-oscillating and practically constant electric field, respectively. A
significant enhancement effect of the oscillating character of the electric
field on the intersubband transitions is encountered. Our analytical results
are in qualitative agreement with those obtained for the graphene layer by
numerical methods. Estimates of the expected experimental values for the
typically employed AGNR and laser parameters show that both the Rabi
oscillations and multiphoton absorption are accessible in the laboratory. The
data relevant to the intersubband tunneling makes the AGNR a 1D condensed
matter analog in which the quantum electrodynamic vacuum decay can be detected
by applying an external laboratory electric field.
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