Crossover of coherent Rabi oscillations in graphene

Enamullah,; Kumar, Vipin; Setlur, Girish S.

doi:10.1016/j.physb.2012.08.005

Cited by 19 publications

(24 citation statements)

References 23 publications

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“…Rabi oscillations have also been studied in graphene single layer by Mishchenko [17] and Ishikawa [18] using the well-known rotating wave approximation [5] (RWA) close to resonance and also in Landau-quantized graphene by Dora et al [19]. Recently, we predicted anomalous Rabi oscillations (AROs) in graphene that occur far from resonance using an alternative to RWA that we have been calling asymptotic rotating wave approximation [20] (ARWA). This is the regime in which the incident optical frequency is much higher than the frequency corresponding to particle-hole energy.…”

Section: Introductionmentioning

confidence: 99%

“…In our earlier work [20], we have treated the EM field as classical, whereas in this article we treat the EM field quantum mechanically. We wish to show that the phenomenon of AROs occurs even when the EM field is quantum, thereby establishing unequivocally that the AROs are due to pseudospin and not due to approximations or assumptions we have made.…”

Section: Introductionmentioning

confidence: 99%

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Quantum Rabi oscillations in graphene

Enamullah

Kumar

et al. 2014

J. Opt. Soc. Am. B

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Graphene has been theoretically shown to exhibit anomalous Rabi oscillations (AROs) far from resonance in addition to conventional Rabi oscillations close to resonance (classical light frequency matches particle-hole frequency). The ARO has been attributed to the pseudospin degree of freedom that is unique to graphene-like systems. In this work, we show the same phenomenon also occurs in the single-photon limit or even in a vacuum. This is to be expected for conventional Rabi oscillations; however, the prediction that AROs also occur in the single-photon situation means that this notion of ARO is robust and not an artifact of approximations. We also study collapse and revival of both conventional and AROs in response to a coherent radiation field and extract the collapse and revival times in both cases.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantum Rabi oscillations in graphene

Enamullah

Kumar

et al. 2014

J. Opt. Soc. Am. B

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“…1591, 318-319 (2014); doi: 10.1063/1.4872586 frequency associated with the particle-hole creation. In order to solve above equations we use the well known rotating wave approximation (RWA) [2,3] for resonance case, whereas far-from resonance we use the alternative of RWA which we are calling asymptotic rotating wave approximation (ARWA) [4].…”

Section: Quantum Rabi Oscillationsmentioning

confidence: 99%

“…In order to solve these equations analytically approximation is needed, one such approximation goes by name asymptotic rotating wave approximation (ARWA) [4]. The approximation is valid only for the regime where the external driving frequency is much higher than both Rabi frequency as well as the frequency corresponding to particle-hole symmetry.…”

Section: Anomalous Quantum Rabi Oscillations Using Arwamentioning

confidence: 99%

Conventional and anomalous quantum Rabi oscillations in graphene

Khan¹,

Kumar²,

Kumar³

et al. 2014

AIP Conference Proceedings

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Rabi oscillations in a strongly driven semiconductor quantum wellAbstract. We study the non linear response of graphene in presence of quantum field in two different regimes. Far from resonance, using our new technique asymptotic rotating wave approximation (ARWA), we obtained that the matter field interaction leads to the slow oscillations like conventional Rabi oscillations observed in conventional semiconductors using well known rotating wave approximation (RWA). The Rabi frequency obtained in both the regimes.

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“…For off resonance, a new approximation is needed to solve the Bloch equations where we use the alternative of RWA called ARWA well discussed in single layer graphene [6] in which the unknown namely the number density and polarization density are expressed as a harmonic series involving the largest of the frequencies. In this regime we assume that the largest of the frequency is the external frequency (ʘ) which is much greater than both ʘ R and 2ʘ T .…”

Section: Anomalous Rabi Oscillation Using Arwamentioning

confidence: 99%

Rabi oscillations in trilayer graphene

Enamullah¹,

Kumar²,

Setlur³

2013

AIP Conference Proceedings

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We study the nonlinear optical phenomenon, Rabi oscillations in trilayer graphene in presence of an optical field in two different regime -close to resonance and far from resonance. Close to resonance means when the incident optical frequency is nearly equal to transition frequency. We find the Rabi frequency in both the regime -near to resonance conventional Rabi frequency (CRF) is obtained by an approximation well known as rotating wave approximation (RWA). Far from resonance, anomalous Rabi frequency (ARF), unique to grapheme, is obtained using an alternative of RWA called asymptotic RWA (ARWA), introduced by us for single layer graphene. The existence of anomalous Rabi oscillation (ARO) is attributable to a peculiar property of graphene, namely, pseudo spin.

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Crossover of coherent Rabi oscillations in graphene

Cited by 19 publications

References 23 publications

Quantum Rabi oscillations in graphene

Quantum Rabi oscillations in graphene

Conventional and anomalous quantum Rabi oscillations in graphene

Rabi oscillations in trilayer graphene

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