Spectral Control of an X-Ray 
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-Edge Transition via a Thin-Film Cavity

Haber, Johann; Gollwitzer, Jakob; Francoual, S.; Tolkiehn, Martin; Strempfer, J.; Röhlsberger, Ralf

doi:10.1103/physrevlett.122.123608

Cited by 31 publications

(46 citation statements)

References 46 publications

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“…In the experiments so far [21][22][23][24][25]27], the approximation was found to be possible due to the narrow nuclear response. We note, however, that when strong coupling effects are present [27] or for broader electronic resonances [48], the approximation may break down and it may not be possible to separate the cavity and the nuclear response.…”

Section: Separating the Contributions Of Cavity And Nucleimentioning

confidence: 94%

“…Such setups have been studied in a multitude of experiments, featuring a variety of different cavities (see Refs. [21][22][23][24][25][26][27]48] for the most recent quantum optics experiments). For simplicity, we restrict ourselves to the unpolarized and unmagnetized case, which already features the essential ingredients.…”

Section: A Recap Of the Phenomenological Modelmentioning

confidence: 99%

“…(1). The phenomenological few-mode model summarized so far has been employed for the analysis of various experiments in x-ray cavity QED [23][24][25]27,48], providing a basis for the quantum mechanical interpretation of the system. However, for certain cavities, it was found that heuristic extensions to the model are necessary.…”

Section: A Recap Of the Phenomenological Modelmentioning

confidence: 99%

“…While with these heuristic extensions included, good agreement with the layer formalism and experiment is found in many cases (see, e.g., Refs. [23][24][25]27,45,48]), there are still quantitative and even qualitative differences for important setups, such as the EIT cavity [46] that is investigated experimentally in Ref. [22].…”

Section: A Recap Of the Phenomenological Modelmentioning

confidence: 99%

“…note that while thin-film cavities have become particularly popular in the nuclear resonance scattering community, they also facilitate x-ray quantum optics with electronic resonances [48].…”

Section: Introductionmentioning

confidence: 99%

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Ab initio quantum models for thin-film x-ray cavity QED

Lentrodt

Heeg

Keitel

et al. 2020

Phys. Rev. Research

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We develop two ab initio quantum approaches to thin-film x-ray cavity quantum electrodynamics with spectrally narrow x-ray resonances, such as those provided by Mössbauer nuclei. The first method is based on a few-mode description of the cavity, and promotes and extends existing phenomenological few-mode models to an ab initio theory. The second approach uses analytically known Green's functions to model the system. The two approaches not only enable one to ab initio derive the effective few-level scheme representing the cavity and the nuclei in the low-excitation regime, but also provide a direct avenue for studies at higher excitation, involving nonlinear or quantum phenomena. The ab initio character of our approaches further enables direct optimizations of the cavity structure and thus of the photonic environment of the nuclei, to tailor the effective quantum optical level scheme towards particular applications. To illustrate the power of the ab initio approaches, we extend the established quantum optical modeling to resonant cavity layers of arbitrary thickness, which is essential to achieve quantitative agreement for cavities used in recent experiments. Further, we consider multilayer cavities featuring electromagnetically induced transparency, derive their quantum optical few-level systems ab initio, and identify the origin of discrepancies in the modeling found previously using phenomenological approaches as arising from cavity field gradients across the resonant layers.

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