Quantum model of coupled intersubband plasmons

Pegolotti, Giulia; Vasanelli, Angela; Todorov, Yanko; Sirtori, Carlo

doi:10.1103/physrevb.90.035305

Cited by 28 publications

(59 citation statements)

References 28 publications

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“…16 is the overlap factor between the cavity mode and the absorbing region (including the contact layers) E p ¼ 7 meV is the ISB plasma energy, 31,32 and C isb ¼ 4.2 meV is the FWHM of the ISB peak extracted from a Lorentzian fit of the high energy part of the mesa photo-response (Fig. 3(c)).…”

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confidence: 99%

Patch antenna terahertz photodetectors

Palaferri

Todorov

Chen

et al. 2015

Applied Physics Letters

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We report on the implementation of 5 THz quantum well photodetector exploiting a patch antenna cavity array. The benefit of our plasmonic architecture on the detector performance is assessed by comparing it with detectors made using the same quantum well absorbing region, but processed into a standard 45° polished facet mesa. Our results demonstrate a clear improvement in responsivity, polarization insensitivity, and background limited performance. Peak detectivities in excess of 5 × 1012 cmHz1/2/W have been obtained, a value comparable with that of the best cryogenic cooled bolometers.

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confidence: 99%

Patch antenna terahertz photodetectors

Palaferri

Todorov

Chen

et al. 2015

Applied Physics Letters

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“…The operators B † α,k , B α,k are bosonic creation and annihilation operators of the intersubband excitations. As only the transitions with low |k| are coupled to light, the electronic dispersion can safely be neglected and w α is assumed independent of k. The quantity j α (z) is the intersubband current density and it is computed from the electronic wavefunctions together with the occupation of the corresponding subbands 19 . The multisubband plasmon Hamiltonian is given by 18 :…”

Section: Superradiant States In Dense Electron Gases: Multisub-bamentioning

confidence: 99%

“…In section II, we present our microscopic model of the collective excitations of the electron gas, the multisubband plasmons (MSPs). It is based on the dipole representation of the light-matter interaction in the Coulomb gauge 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Strong and ultrastrong coupling with free-space radiation

et al. 2016

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Strong and ultra-strong light-matter coupling are remarkable phenomena of quantum electrodynamics occurring when the interaction between a matter excitation and the electromagnetic field cannot be described by usual perturbation theory. This is generally achieved by coupling an excitation with large oscillator strength to the confined electromagnetic mode of an optical microcavity. In this work we demonstrate that strong/ultra-strong coupling can also take place in the absence of optical confinement. We have studied the non-perturbative spontaneous emission of collective excitations in a dense two-dimensional electron gas that supperradiantly decays into free space. By using a quantum model based on the input-output formalism, we have derived the linear optical properties of the coupled system and demonstrated that its eigenstates are mixed light-matter particles, like in any system displaying strong or ultra-strong light-matter interaction. Moreover, we have shown that in the ultra-strong coupling regime, i.e. when the radiative broadening is comparable to the matter excitation energy, the commonly used rotating-wave and Markov approximations yield unphysical results. Finally, the input-output formalism has allowed us to prove that Kirchhoff's law, describing thermal emission properties, applies to our system in all the light-matter coupling regimes considered in this work.

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“…The PZW Hamiltonian thus provides a general framework that fully captures both the many-body and quantum-optical aspects in a solid-state system in interaction with the electromagnetic radiation. In particular, this formalism was proven useful in describing the ultrastrong light-matter coupling regime [5] between the intersubband plasmons of a two-dimensional electron gas and a single mode of planar waveguides or microresonators [4,[6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…We explore the collective modes of the electron gas, driven by the P-quadratic term of the quantum Hamiltonian as well as the polariton modes of the system, arising from the coupling with the spatially confined electromagnetic modes. Contrary to previous works [4,6,8], we now consider all possible col-* yanko.todorov@univ-paris-diderot.fr lective plasmonic modes, where electrons vibrate both along and perpendicular to the direction of quantum confinement. Furthermore, we use a full modal decomposition of the electromagnetic field.…”

Section: Introductionmentioning

confidence: 99%

Dipolar quantum electrodynamics of the two-dimensional electron gas

Todorov

2015

Phys. Rev. B

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Similarly to a previous work on the homogeneous electron gas [Y. Todorov, Phys. Rev. B 89, 075115 (2014)], we apply the Power-Zienau-Wooley (PZW) formulation of the quantum electrodynamics to the case of an electron gas quantum confined by one-dimensional potential. We provide a microscopic description of all collective plasmon modes of the gas, oscillating both along and perpendicular to the direction of quantum confinement. Furthermore, we study the interaction of the collective modes with a photonic structure, planar metallic waveguide, by using the full expansion of the electromagnetic field into normal modes. We show how the boundary conditions for the electromagnetic field influence both the transverse light-matter coupling and the longitudinal particleparticle interactions. The PZW descriptions appear thus as a convenient tool to study semiconductor quantum optics in geometries where quantum-confined particles interact with strongly confined electromagnetic fields in microresonators, such as the ones used to achieve the ultrastrong light-matter coupling regime.

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Quantum model of coupled intersubband plasmons

Cited by 28 publications

References 28 publications

Patch antenna terahertz photodetectors

Patch antenna terahertz photodetectors

Strong and ultrastrong coupling with free-space radiation

Dipolar quantum electrodynamics of the two-dimensional electron gas

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