Rabi Flopping in a Two-Level System with a Time-Dependent Energy Renormalization: Intersubband Transitions in Quantum Wells

Batista, Adriano A.; Citrin, D. S.

doi:10.1103/physrevlett.92.127404

Cited by 60 publications

(36 citation statements)

References 20 publications

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“…However, one can use pulses that are suitably chirped to compensate for a change of frequency of the optical transition in time induced by the pulses themselves. This idea was proposed in studies of a two-state system in relation to Rabi oscillations in inter-subband transitions in quantum wells 21 and for obtaining efficient stimulated Raman adiabatic passage in molecules in a dense medium. 19 Let us suppose that we use suitably chirped pulses compensating the "local field" detuning pDn that enables us to keep the value of x 21 À pDnðtÞ À xðtÞ Dx as a constant.…”

Section: 18mentioning

confidence: 99%

Nonlinear organic plasmonics: Applications to optical control of Coulomb blocking in nanojunctions

Fainberg

2015

Applied Physics Letters

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Purely organic materials with negative and near-zero dielectric permittivity can be easily fabricated. Here, we develop a theory of nonlinear non-steady-state organic plasmonics with strong laser pulses that enable us to obtain near-zero dielectric permittivity during a short time. Our consideration is based on the model of the interaction of strong (phase modulated) laser pulse with organic molecules developed by one of the authors before, extended to the dipole-dipole intermolecular interactions in the condensed matter. We have proposed to use non-steady-state organic plasmonics for the enhancement of intersite dipolar energy-transfer interaction in the quantum dot wire that influences on electron transport through nanojunctions. Such interactions can compensate Coulomb repulsions for particular conditions. We propose the exciton control of Coulomb blocking in the quantum dot wire based on the non-steady-state near-zero dielectric permittivity of the organic host medium.

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Section: 18mentioning

confidence: 99%

Nonlinear organic plasmonics: Applications to optical control of Coulomb blocking in nanojunctions

Fainberg

2015

Applied Physics Letters

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“…Unbound excitations, ISBTs have a narrow absorption line thanks to the fact that conduction subbands are quasi-parallel [23,24] (see Fig. 2 (a) for a graphical representation).…”

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confidence: 99%

Theory of intersubband resonance fluorescence

Shammah¹,

Liberato²

2015

Phys. Rev. B

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The fluorescence spectrum of a strongly pumped two level system is characterized by the Mollow triplet that has been observed in a variety of systems, ranging from atoms to quantum dots and superconducting qubits. We theoretically studied the fluorescence of a strongly pumped intersubband transition in a quantum well. Our results show that the many-electron nature of such a system leads to a modification of the usual Mollow theory. In particular, the intensity of the central peak in the fluorescence spectrum becomes a function of the electron coherence, allowing access to the coherence time of a two dimensional electron gas through a fluorescence intensity measurement.The fluorescence spectrum of a resonantly pumped two level system (TLS) is characterised by the three peak profile named after Mollow [1]. Under strong pumping, the levels of the TLS are split by the ac Stark effect into doublets, |± , whose splitting, Ω, is directly proportional to the pump amplitude. Of the four possible spontaneous emission channels between two doublets, two are resonant with the bare frequency of the TLS, ω 12 , and the other two are at frequency ω 12 ± Ω [see Fig. 1 for a scheme of the emission channels and frequencies]. From this simple picture it can be inferred that the emission from the central peak and from the satellites are in ratio 1:2:1, a result that still holds for more refined theoretical approaches [2][3][4]. To date the Mollow triplet has been observed in a wealth of different systems well modelled by a TLS: atoms [5,6], quantum dots [7][8][9][10][11][12], single molecules [13], superconducting qubits [14][15][16], and semiconductor quantum well (QW) excitons [17,18].Intersubband transitions (ISBTs) occur between two QW conduction subbands, with the lower one containing a two dimensional electron gas (2DEG) created through doping [19], temperature [20], or by optically exciting electrons from the valence band [21,22]. Unbound excitations, ISBTs have a narrow absorption line thanks to the fact that conduction subbands are quasi-parallel [23,24] (see Fig. 2 (a) for a graphical representation). Although in ISBTs the Mollow triplet has not yet been directly measured, the ac Stark effect, which can be interpreted as indirect evidence, has been clearly observed [25]. While ISBTs are usually theoretically described as collections of independent TLSs [25-28], it has recently been shown [29] that such an approximation breaks down in the nonlinear regime, when a macroscopic fraction of the total number of electrons is in the excited subband. As explained in Ref. [29], the origin of such a difference can be intuitively traced to the different dimensionality of the Hilbert space: 2 N for a collection of N TLSs and 2N N for an ISBT involving N electrons and neglecting border effects, which tends tofor large N . In a setup adapted to measure the resonance fluorescence of the system, almost all the electrons in the first subband are excited at the same time [25]. We can thus expect that the TLS approximation, used to derive the...

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“…In recent years, Rabi flopping and coherent propagation of ultrashort electromagnetic pulses have been studied both theoretically and experimentally when intersubband transitions of semiconductor quantum wells interact with electromagnetic fields [1,2,3,4,5,6,7,8,9]. In some of these studies the Rabi flopping [2,3,8] and the coherent propagation of ultrashort far-infrared electromagnetic pulses [4,5,7] that interact with a two-subband system in a symmetric semiconductor quantum well structure, taking into account the effects of electronelectron interactions, have been presented.…”

Section: Introductionmentioning

confidence: 99%

“…In some of these studies the Rabi flopping [2,3,8] and the coherent propagation of ultrashort far-infrared electromagnetic pulses [4,5,7] that interact with a two-subband system in a symmetric semiconductor quantum well structure, taking into account the effects of electronelectron interactions, have been presented. All these studies have shown that at certain electron densities the electron-electron interactions make the intersubband transitions to behave quite differently from atomic transitions.…”

Section: Introductionmentioning

confidence: 99%

Ultrashort Pulse Interaction with Intersubband Transitions of Semiconductor Quantum Wells

Katsantonis

Σταθάτος

Paspalakis

2015

J. Phys.: Conf. Ser.

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Rabi Flopping in a Two-Level System with a Time-Dependent Energy Renormalization: Intersubband Transitions in Quantum Wells

Cited by 60 publications

References 20 publications

Nonlinear organic plasmonics: Applications to optical control of Coulomb blocking in nanojunctions

Nonlinear organic plasmonics: Applications to optical control of Coulomb blocking in nanojunctions

Theory of intersubband resonance fluorescence

Ultrashort Pulse Interaction with Intersubband Transitions of Semiconductor Quantum Wells

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