Manipulating valence and core electronic excitations of a transition-metal complex using UV/Vis and X-ray cavities

Abstract

We demonstrate how optical cavities can be exploited to control both valence- and core-excitations in a prototypical model transition metal complex, ferricyanide (\tmc), in the aqueous environment. The spectroscopic signatures...

Polariton ring currents and circular dichroism of Mg-porphyrin in a chiral cavity

“…Similar effects were observed for a transition metal complex. 30 Had we retained only the resonant |M ± 〉 states, the polariton states |P 1/2 〉 would be an equal mixture of states |M + , 0〉 and |G, 1〉 as in the Jaynes–Cummings model. However, |P 2 〉 is primarily |M + , 0〉 whereas |P 1 〉 is primarily |G, 1〉.…”

Inverse design of artificial two-level systems with Mössbauer nuclei in thin-film cavities

“…The resonant layer, i.e. the layer containing the nuclear resonances, is chosen to be about two atomic layers of 57 Fe which corresponds to a layer thickness of 0.574 nm, as has been utilized in [26]. At such low layer thicknesses, long-range magnetic order and magnetic hyperfine splittings are suppressed, such that the iron nuclei can be approximated as unsplit two-level systems.…”

“…We focus the design on the nm-scale layer thicknesses and materials as well as the x-ray incidence angle, rather than allowing for photonic structures with arbitrary shapes. This is motivated by the present state-of-the-art in cavity fabrication, but also by the fact that hard x-ray wavelengths considered here are on or below the scale of the lattice parameters of corresponding materials-for example, the resonance wavelength of the Mössbauer transition in 57 Fe is 86 pm, whereas the lattice constant of α-Fe is 287 pm.…”

“…Examples include the collective Lamb shift (CLS) and superradiance (SR) [26] (which have been intensely studied in other systems [11,[31][32][33][34][35][36][37][38][39][40]), electromagnetically induced transparency [27] (see [41] for a review), vacuum generated coherences [42] (see [43,44] for reviews), the realization of strong coupling [45], Rabi-oscillations [46] and sub-luminal propagation of x-ray pulses [47] (see, e.g., [48,49]). Beyond that, a number of schemes involving x-ray cavities have been theoretically proposed (see, e.g., [50][51][52][53] and references therein), as well as related schemes in other photonic environments [25,[54][55][56][57][58].…”

“…The latter is for- (Color online) Schematic setup of the archetypal thin-film cavity system and illustration of its relation to the artificial two-level scheme. The cavity consists of a stack of different layers (thicknesses and exemplary materials are indicated) and a single, thin layer of Mössbauer nuclei (here: 57 Fe). The cavity is illuminated in grazing incidence with x-rays near-resonant to the nuclear transition frequency.…”