Coherent propagation and quantum beats of quadrupole polaritons in Cu_{2}O

Fröhlich, D.; Kulik, A.V.; Uebbing, B.; Mysyrowicz, A.; Langer, V.; Stolz, H.; Osten, W. von der

doi:10.1103/physrevlett.67.2343

Cited by 235 publications

(154 citation statements)

References 10 publications

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“…They are thought to originate from interference between states of the lower and upper polaritonic branches. 10,11 Such oscillations have so far only been observed for resonant one-photon excitation in a transmission geometry, and it is not immediately clear that the polaritonic interference would be relevant to the present two-photon experiment and a B-TPE excitation scheme. In the following section we therefore make an excursion to the semiclassical theory of the polariton oscillations of transmitted light, which allows us to obtain an analytical expression for these oscillations.…”

Section: Polariton Oscillationsmentioning

confidence: 97%

“…10,11 In principle, the transmission intensity can be found by a straightforward numerical calculation, as was done in Ref. [10].…”

Section: Polariton Oscillations In Transmission Of Light and Geomementioning

confidence: 99%

“…6 Apart from the intriguing possibility of BEC, there is a number of other interesting phenomena and properties of the exciton gas in Cu 2 O which attracted attention, including localization of excitons in a stress trap, 7,8 spectroscopy on intra-excitonic transitions, 9 and the observation of polariton beating in transmission experiments resulting from interference of excited states belonging to different polariton dispersion branches. 10,11 In this paper we revisit the high density ortho exciton gas in Cu 2 O. The first part of the paper is concerned with spectroscopic photoluminescence excitation experiments revealing a novel and efficient non-linear exciton excitation scheme, which has several advantages over the schemes used so far.…”

Section: Introductionmentioning

confidence: 99%

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Decay and coherence of two-photon excited yellow orthoexcitons inCu2O

et al. 2005

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Photoluminescence excitation spectroscopy has revealed a novel, highly efficient two-photon excitation method to produce a cold, uniformly distributed high density excitonic gas in bulk cuprous oxide. A study of the time evolution of the density, temperature and chemical potential of the exciton gas shows that the so called quantum saturation effect that prevents Bose-Einstein condensation of the ortho-exciton gas originates from an unfavorable ratio between the cooling and recombination rates. Oscillations observed in the temporal decay of the ortho-excitonic luminescence intensity are discussed in terms of polaritonic beating. We present the semiclassical description of polaritonic oscillations in linear and non-linear optical processes.

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Section: Polariton Oscillationsmentioning

confidence: 97%

“…10,11 In principle, the transmission intensity can be found by a straightforward numerical calculation, as was done in Ref. [10].…”

Section: Polariton Oscillations In Transmission Of Light and Geomementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decay and coherence of two-photon excited yellow orthoexcitons inCu2O

et al. 2005

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“…4. Clearly, we see some differences between the two cases, especially in the trailing edge of the probe pulse, where the optical ringing [23,24] occur for both cases, however the oscillations in the trailing edge disappear for symmetric detunings case for larger t/T because a steady dark state is reached quite fast after the interaction with the first 20 pulses for optical depths µ p ζ < 6 ps −1 . As mentioned before, these differences come from the contribution of all other off-resonant comb modes of both lasers, Fig.…”

Section: Propagation Of Probe and Coupling Laser Pulsementioning

confidence: 98%

Propagation of two short laser pulse trains in a Λ-type three-level medium under conditions of electromagnetically induced transparency

Buică¹,

Nakajima²

2014

Optics Communications

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We investigate the dynamics of a pair of short laser pulse trains propagating in a medium consisting of three-level Λ-type atoms by numerically solving the Maxwell-Schrödinger equations for atoms and fields. By performing propagation calculations with different parameters, under conditions of electromagnetically induced transparency, we compare the propagation dynamics by a single pair of probe and coupling laser pulses and by probe and coupling laser pulse trains. We discuss the influence of the coupling pulse area, number of pulses, and detunings on the probe laser propagation and realization of electromagnetically induced transparency conditions, as well on the formation of a dark state.

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“…For instance, it has also been derived to describe the propagation of short weak laser pulses through resonant matter [37] and has been used experimentally to enhance transient absorption in the infrared [38]. Experimentally, the coherent propagation and quantum beats of quadrupole polaritons in Cu 2 O have been reported [39], and also the coherent control of excitons in semiconductor heterostructures has been intensely studied (see, e.g., [40] and references therein). The dynamical beat has been observed also in the coherent interaction of femtosecond extreme uv-light pulses with Helium atoms [41].…”

Section: B Time-dependent Coherent Decay Ratementioning

confidence: 99%

Coherent control of the cooperative branching ratio for nuclear x-ray pumping

2011

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Coherent control of nuclear pumping in a three level system driven by x-ray light is investigated. In single nuclei, the pumping performance is determined by the branching ratio of the excited state populated by the x-ray pulse. Our results are based on the observation that in ensembles of nuclei, cooperative excitation and decay leads to a greatly modified nuclear dynamics, which we characterize by a time-dependent cooperative branching ratio. We discuss prospects of steering the x-ray pumping by coherently controlling the cooperative decay. First, we study an ideal case with purely superradiant decay and perfect control of the cooperative emission. A numerical analysis of x-ray pumping in nuclear forward scattering with coherent control of the cooperative decay via externally applied magnetic fields is presented. Next, we provide an extended survey of nuclei suitable for our scheme, and propose proof-of-principle implementations already possible with typical Mössbauer nuclear systems such as 57 Fe. Finally, we discuss the application of such control techniques to the population or depletion of long-lived nuclear states. PACS numbers: 73.20.Mf, 78.70.Ck, 75.78.Jp, 76.80.+y Coherent control in quantum optics and atomic physics provides an efficient tool to investigate atomic properties and favorably manipulate the dynamics of the system alike. Similar possibilities with nuclear systems have been considered with great interest [1-8] already shortly after the realization of the first laser in the optical band [9]. However, many quantum optical control schemes require the effective coupling of the driving field to the considered transition (Rabi frequency) to be of the same order as the relaxation rate of the same transition [10,11]. Consequently it is very demanding to exploit the direct laser driving of nuclear systems experimentally. Furthermore, the dream of the nuclear laser is at present equally out of reach. The pursuit of coherent sources for wavelengths around or below 1 nm is supported however by the advent and commissioning of x-ray free electron lasers [12,13], the availability of which will stimulate the transfer of quantum optical schemes to nuclei along these lines.A different route to coherent control of nuclear dynamics which does not rely on forthcoming x-ray light sources is coherent light scattering off nuclei in the low-excitation limit [14][15][16][17][18]. In particular, coherent nuclear forward scattering (NFS) is a routine technique experimentally studied in many labs around the world. In NFS, high-frequency light such as that from a synchrotron radiation (SR) source is monochromatized at a nuclear resonance energy, and then scatters coherently off a nuclear target. As has recently been realized, while being conceptionally different from the attempts to directly transfer quantum optical schemes to the nuclear realm, NFS does allow to explore coherent control of nuclei in experimental settings already available today [19][20][21][22]. The possibility of control exploited in these works ar...

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Coherent propagation and quantum beats of quadrupole polaritons in Cu_{2}O

Cited by 235 publications

References 10 publications

Decay and coherence of two-photon excited yellow orthoexcitons inCu2O

Decay and coherence of two-photon excited yellow orthoexcitons inCu2O

Propagation of two short laser pulse trains in a Λ-type three-level medium under conditions of electromagnetically induced transparency

Coherent control of the cooperative branching ratio for nuclear x-ray pumping

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