Gate and magnetic field tunable ultrastrong coupling between a magnetoplasmon and the optical mode of an LC cavity

Paravicini‐Bagliani, Gian Lorenzo; Scalari, Giacomo; Valmorra, Federico; Keller, Janine; Maissen, Curdin; Beck, Mattias; Faist, Jérôme

doi:10.1103/physrevb.95.205304

Cited by 19 publications

(17 citation statements)

References 39 publications

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“…In contrast, at integer filling factors (bottom panel) we observe a set of linear dispersions, which are attributed to the excitation of an inter-Landau level transition and its higher orders. Their slopes are consistent with previous findings [20].…”

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confidence: 93%

“…The THz transmission measurement shown in Fig. 1d) hence shows the anti-crossing behaviour of the electronic resonance (green curve) strongly coupled to the resonator arXiv:1805.00846v3 [quant-ph] 17 Oct 2018 [20] are overlayed as magenta curves. They result from the anti-crossing of the magneto-plasmon dispersion (green) and the resonator frequency (red).…”

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confidence: 99%

“…Solid-state systems [3][4][5] have recently proven to be instrumental in achieving the ultimate limit of this kind of coupling. The ultrastrong coupling regime [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], realized in the limit of Ω/ω 0.1, exploits the collective nature of the matter excitations [6,21,22] to achieve a peculiar situation where the ground state of the system is constituted by non-trivial quantum vacua [6].…”

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confidence: 99%

“…These approximately correspond to the half integer and integer filling factors respectively, where ρ dark xx reaches its maxima and minima. (top) The longitudinal photo-response R = ∆ρxx/Pirr shows a change when resonant to the magneto plasmon polariton dispersions fitted with magenta curves (see supplementary material for the model[20]). Polaritons result from the anti-crossing of the resonator frequency (red) and the magneto-plasmon dispersion (green), which itself converges to the cyclotron dispersion (white dashed).…”

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Magneto-transport controlled by Landau polariton states

et al. 2018

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Hybrid excitations, called polaritons, emerge in systems with strong light-matter coupling. Usually, they dominate the linear and nonlinear optical properties with applications in quantum optics. Here, we show the crucial role of the electronic component of polaritons in the magnetotransport of a cavity-embedded 2D electron gas in the ultrastrong coupling regime. We show that the linear dc resistivity is significantly modified by the coupling to the cavity even without external irradiation. Our observations confirm recent predictions of vacuum-induced modification of the resistivity. Furthermore, photo-assisted transport in presence of a weak irradiation field at sub-THz frequencies highlights the different roles of localized and delocalized states.The strong light-matter coupling regime [1, 2] is realized when the coupling Ω between photons and a material's excitation of frequency ω exceeds the losses γ tot of both components. An especially interesting situation is attained when quantum fluctuations of the electromagnetic field ground state give rise to the so-called vacuum Rabi splitting of the cavity polaritons. Solid-state systems [3][4][5] have recently proven to be instrumental in achieving the ultimate limit of this kind of coupling. The ultrastrong coupling regime [6-20], realized in the limit of Ω/ω 0.1, exploits the collective nature of the matter excitations [6,21,22] to achieve a peculiar situation where the ground state of the system is constituted by non-trivial quantum vacua [6].The (ultra-)strong coupling regime has so far mostly been investigated by interrogating the photonic component of the polariton quasi-particle weakly probing the coupled system with low photon fluxes [1-5, 7, 9, 10, 13-17, 19, 23-25]. Notable exceptions have been the measurements of the matter part of an exciton polariton condensate with an excitonic 1s-2p transition[26] and a transport experiment in molecules coupled to a plasmonic resonance [18].Recently we pioneered a new experimental platform, the Landau polaritons, to study ultrastrong light matter interactions [15,27] allowing to reach record-high nor-malized light-matter coupling ratios Ω/ω cav > 1 [28]. The inter-Landau level (cyclotron) transition ω c = eB m * (m * : effective electron mass) of a two-dimensional electron gas (2DEG) under strong magnetic field is coupled to a complementary electronic LC resonator [29] at frequencies of 100's of GHz, which plays effectively the role of the optical cavity. This system is especially well suited to study the matter part of ultrastrongly coupled polaritons using low temperature magneto-transport.It was recently proposed theoretically [30] that such transport is actually driven by the bright polariton operator, i.e. the same operator driving the optical response.Here we find experimental evidence consistent with this picture, in which most tellingly the longitudinal resistivity ρ xx bears the signatures of the polariton branches.Further confirmation for polaritonic effects acting on magneto-transport is obtained by observ...

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Magneto-transport controlled by Landau polariton states

et al. 2018

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“…Passing electromagnetic radiation through a twodimensional electron system (2DES), placed in a magnetic field, one would observe the collective magnetoplasma cyclotron resonance, which is shifted to a higher frequency because of a depolarization effect [4][5][6][7][8][9][10]. This is very similar to the CR observed in semiconductors.…”

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Azbel'-Kaner-like cyclotron resonance in a two-dimensional electron system

et al. 2017

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Resonant microwave absorption of a two-dimensional electron system in an AlGaAs/GaAs heterostructure excited by a near-field technique was investigated. Along with collective magnetoplasmon modes, we observed resonance that precisely follows the cyclotron resonance (CR) position and revealed no signs of collective plasma depolarization shift. We show that the discovered CR mode is absent in the Faraday geometry, and is localized at the edge of the exciting metal electrode. Such behavior points in favor of the single-particle Azbel'-Kaner nature of the discovered resonance.

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