Linewidth-narrowing phenomena with intersubband cavity polaritons

Murphy, Francis J.; Bak, Alexey O.; Matthews, Mary; Dupont, Emmanuel; Amrania, Hemmel; Phillips, Chris C.

doi:10.1103/physrevb.89.205319

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…While hints of this phenomenon have been observed in Ref. 26, here we provide a full and quantitative characterization of it. We experimentally demonstrate the dominantly inhomogeneous origin of the ISB plasmon absorption linewidth in MQWs system, and we quantitatively explain our observations using a theoretical model inspired from the seminal work Ref.…”

Section: Introductionsupporting

confidence: 51%

Immunity of intersubband polaritons to inhomogeneous broadening

et al. 2017

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We demonstrate that intersubband (ISB) polaritons are robust to inhomogeneous effects originating from the presence of multiple quantum wells (MQWs). In a series of samples that exhibit mid-infrared ISB absorption transitions with broadenings varying by a factor of 5 (from 4 meV to 20meV), we have observed polariton linewidths always lying in the 4 - 7 meV range only. We have experimentally verified the dominantly inhomogeneous origin of the broadening of the ISB transition, and that the linewidth reduction effect of the polariton modes persists up to room-temperature. This immunity to inhomogeneous broadening is a direct consequence of the coupling of the large number of ISB oscillators to a single photonic mode. It is a precious tool to gauge the natural linewidth of the ISB plasmon , that is otherwise masked in such MQWs system , and is also beneficial in view of perspective applications such as intersubband polariton lasers

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Section: Introductionsupporting

confidence: 51%

Immunity of intersubband polaritons to inhomogeneous broadening

et al. 2017

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“…26). The gas temperature near the anode can be very high; for example, at least several thousand Kelvin in thermal plasmas of atmospheric-pressure arcs [267]. The nanostructures grown on these nanoparticles are usually collected at the opposite electrode (cathode) or at special collecting surfaces such as the surfaces of a cubic magnet in panel (a).…”

Section: 322mentioning

confidence: 99%

Plasma nanoscience: from nano-solids in plasmas to nano-plasmas in solids

Ostrikov

Neyts

Meyyappan

2013

Advances in Physics

498

391

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The unique plasma-specific features and physical phenomena in the organization of nanoscale solid-state systems in a broad range of elemental composition, structure, and dimensionality are critically reviewed. These effects lead to the possibility to localize and control energy and matter at nanoscales and to produce self-organized nano-solids with highly unusual and superior properties. A unifying conceptual framework based on the control of production, transport, and self-organization of precursor species is introduced and a variety of plasmaspecific non-equilibrium and kinetics-driven phenomena across the many temporal and spatial scales is explained. When the plasma is localized to micrometer and nanometer dimensions, new emergent phenomena arise. The examples range from semiconducting quantum dots and nanowires, chirality control of single-walled carbon nanotubes, ultra-fine manipulation of graphenes, nano-diamond, and organic matter, to nano-plasma effects and nano-plasmas of different states of matter. Contents

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“…In particular, in GaAs/AlGaAs QWs similar to the ones investigated in Ref. [43], of bare frequency ω 12 = 100 meV, at T = 4.2 K, linewidths of 2.5 meV, corresponding to τ coh = 0.5 ps, can be obtained even under intense pumping [25,28,44]. In such structures, Rabi splittings in excess of 10 meV are achievable for internal pump intensities of the order of ∼MW/cm 2 [25,40], leading to Ωτ coh 10.…”

mentioning

confidence: 56%

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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Linewidth-narrowing phenomena with intersubband cavity polaritons

Cited by 9 publications

References 18 publications

Immunity of intersubband polaritons to inhomogeneous broadening

Immunity of intersubband polaritons to inhomogeneous broadening

Plasma nanoscience: from nano-solids in plasmas to nano-plasmas in solids

Theory of intersubband resonance fluorescence

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