System-environment coupling derived by Maxwell's boundary conditions from the weak to the ultrastrong light-matter-coupling regime

Bamba, Motoaki; Ogawa, T.

doi:10.1103/physreva.88.013814

Cited by 22 publications

(50 citation statements)

References 44 publications

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“…where we considered the coupling coefficients to be frequency independent, as this has recently been shown to give results consistent with a fully microscopic approach derived using Maxwell boundary conditions [23,28]. The presence of extra-cavity modes gives a finite lifetime to intra-cavity light and matter modes, quantified by the loss coefficients Γ ph = πκ 2 ph and Γ el = πκ 2 el .…”

Section: Tions Through the Hamiltoniansmentioning

confidence: 86%

“…[23], the antiresonant terms in Eq. (E3), consisting of two annihilation or two creation operators, are not present in a rigorous microscopic approach, as the negative and positive frequency components of the electromagnetic field do not mix (and the same can be safely assumed for the electronic excitations).…”

Section: Appendix E: Input-output Theorymentioning

confidence: 99%

“…Still, the fascinating new physics observable in the USC regime, ranging from the dynamical Casimir effect [8,9], to superradiant phase transitions [10,11], and ultra-efficient light emission [6,13], stimulated considerable experimental efforts [15][16][17][18][19][20] that have led to the observation of ever increasing values of the normalised coupling in many different systems, with a present world record Ω ω0 = 0.58 [21]. As a consequence, new theoretical investigations, taking a further leap forward, are starting to study what happens when the coupling increases even further and Ω ω0 > 1 [23][24][25][26]. Judging from recent experimental improvements this regime, usually referred to as deep strong coupling (DSC), will soon be experimentally accessible.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Light-Matter Decoupling in the Deep Strong Coupling Regime: The Breakdown of the Purcell Effect

2014

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Improvements both in the photonic confinement and in the emitter design have led to a steady increase in the strength of the light-matter coupling in cavity quantum electrodynamics experiments. This has allowed to access interaction-dominated regimes in which the state of the system can only be described in terms of mixed light-matter excitations. Here we show that, when the coupling between light and matter becomes strong enough, this picture breaks down, and light and matter degrees of freedom totally decouple. A striking consequence of such a counter-intuitive phenomenon is that the Purcell effect is reversed and the spontaneous emission rate, usually thought to increase with the light-matter coupling strength, plummets instead for large enough couplings.

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Section: Tions Through the Hamiltoniansmentioning

confidence: 86%

Section: Appendix E: Input-output Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Light-Matter Decoupling in the Deep Strong Coupling Regime: The Breakdown of the Purcell Effect

2014

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“…We believe that this formalism also sets the basis for more advanced quantum optical applications in the solid state [36,57,58] implemented with quantum-confined electron gas. In that case, dissipation also must be included in the model, which can be achieved through several approaches [59,60].…”

Section: Discussionmentioning

confidence: 99%

“…We can therefore compute directly the three characteristic lengths introduced by Eqs. (59), (70), and (71):…”

Section: Intersubband-intrasubband Coupling and Numerical Examplesmentioning

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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Virtual photons in the ground state of a dissipative system

Liberato

2017

Nat Commun

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Much of the novel physics predicted to be observable in the ultrastrong light–matter coupling regime rests on the hybridisation between states with different numbers of excitations, leading to a population of virtual photons in the system’s ground state. In this article, exploiting an exact diagonalisation approach, we derive both analytical and numerical results for the population of virtual photons in presence of arbitrary losses. Specialising our results to the case of Lorentzian resonances we then show that the virtual photon population is only quantitatively affected by losses, even when those become the dominant energy scale. Our results demonstrate most of the ultrastrong-coupling phenomenology can be observed in loss-dominated systems which are not even in the standard strong coupling regime. We thus open the possibility to investigate ultrastrong-coupling physics to platforms that were previously considered unsuitable due to their large losses.

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System-environment coupling derived by Maxwell's boundary conditions from the weak to the ultrastrong light-matter-coupling regime

Cited by 22 publications

References 44 publications

Light-Matter Decoupling in the Deep Strong Coupling Regime: The Breakdown of the Purcell Effect

Light-Matter Decoupling in the Deep Strong Coupling Regime: The Breakdown of the Purcell Effect

Dipolar quantum electrodynamics of the two-dimensional electron gas

Virtual photons in the ground state of a dissipative system

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