Transmission of a microwave cavity coupled to localized Shiba states

Chirla, Razvan; Manolescu, Andrei; Moca, Cătălin Paşcu

doi:10.1103/physrevb.93.155110

Cited by 5 publications

(3 citation statements)

References 42 publications

(65 reference statements)

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“…( 21) implies t(ω) = 2πiρ(ω)T (ω) where ρ(ω) is the density of states of the external microwave photons. 36 If we assume ρ(ω) to be constant near the resonance frequency and ignore the asymmetric contribution from the real part of the Green's function we obtain…”

Section: B Transmissionmentioning

confidence: 99%

Study of the cavity-magnon-polariton transmission line shape

Harder

Bai

Match

et al. 2016

Sci. China Phys. Mech. Astron.

109

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We experimentally and theoretically investigate the microwave transmission line shape of the cavity-magnon-polariton (CMP) created by inserting a low damping magnetic insulator into a high quality 3D microwave cavity. While fixed field measurements are found to have the expected Lorentzian characteristic, at fixed frequencies the field swept line shape is in general asymmetric. Such fixed frequency measurements demonstrate that microwave transmission can be used to access magnetic characteristics of the CMP, such as the field line width $\Delta H$. By developing an effective oscillator model of the microwave transmission we show that these line shape features are general characteristics of harmonic coupling. At the same time, at the classical level the underlying physical mechanism of the CMP is electrodynamic phase correlation and a second model based on this principle also accurately reproduces the experimental line shape features. In order to understand the microscopic origin of the effective coupled oscillator model and to allow for future studies of CMP phenomena to extend into the quantum regime, we develop a third, microscopic description, based on a Green's function formalism. Using this method we calculate the transmission spectra and find good agreement with the experimental results.Comment: 12 pages, 6 figure

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Section: B Transmissionmentioning

confidence: 99%

Study of the cavity-magnon-polariton transmission line shape

Harder

Bai

Match

et al. 2016

Sci. China Phys. Mech. Astron.

109

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show abstract

“…For instance, it has been suggested to use multiparticle spin states in devices with no spin-orbit coupling [29,[119][120][121][122][123][124][125]. It could also be interesting to use Shiba states which are Andreev states in the presence of a magnetic impurity or strong Coulomb interaction in a quantum dot [130]. Interestingly, several theoretical works have proposed manipulation protocols which circumvent at least partially the imperfections of mesoscopic QED devices, and in particular a limited coherence [112,121,131].…”

Section: Comparison Between the Different Systems And Conclusionmentioning

confidence: 99%

Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Cottet¹,

Dartiailh²,

Desjardins³

et al. 2017

J. Phys.: Condens. Matter

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Circuit QED techniques have been instrumental to manipulate and probe with exquisite sensitivity the quantum state of superconducting quantum bits coupled to microwave cavities. Recently, it has become possible to fabricate new devices where the superconducting quantum bits are replaced by hybrid mesoscopic circuits combining nanoconductors and metallic reservoirs. This mesoscopic QED provides a new experimental playground to study the light-matter interaction in electronic circuits. Here, we present the experimental state of the art of Mesoscopic QED and its theoretical description. A first class of experiments focuses on the artificial atom limit, where some quasiparticles are trapped in nanocircuit bound states. In this limit, the Circuit QED techniques can be used to manipulate and probe electronic degrees of freedom such as confined charges, spins, or Andreev pairs. A second class of experiments consists in using cavity photons to reveal the dynamics of electron tunneling between a nanoconductor and fermionic reservoirs. For instance, the Kondo effect, the charge relaxation caused by grounded metallic contacts, and the photo-emission caused by voltage-biased reservoirs have been studied. The tunnel coupling between nanoconductors and fermionic reservoirs also enable one to obtain split Cooper pairs, or Majorana bound states. Cavity photons represent a qualitatively new tool to study these exotic condensed matter states.

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“…Superconducting contacts are crucial for the study of Cooper pair splitting [19,20], Andreev bound states [21][22][23], and Majorana quasiparticles [24]. In principle, microwave cavities could represent a powerful tool to investigate these features [25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Cavity Photons as a Probe for Charge Relaxation Resistance and Photon Emission in a Quantum Dot Coupled to Normal and Superconducting Continua

et al. 2016

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Microwave cavities have been widely used to investigate the behavior of closed few-level systems. Here, we show that they also represent a powerful probe for the dynamics of charge transfer between a discrete electronic level and fermionic continua. We have combined experiment and theory for a carbon nanotube quantum dot coupled to normal metal and superconducting contacts. In equilibrium conditions, where our device behaves as an effective quantum dot-normal metal junction, we approach a universal photon dissipation regime governed by a quantum charge relaxation effect. We observe how photon dissipation is modified when the dot admittance turns from capacitive to inductive. When the fermionic reservoirs are voltage biased, the dot can even cause photon emission due to inelastic tunneling to/from a BardeenCooper-Schrieffer peak in the density of states of the superconducting contact. We can model these numerous effects quantitatively in terms of the charge susceptibility of the quantum dot circuit. This validates an approach that could be used to study a wide class of mesoscopic QED devices.

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Transmission of a microwave cavity coupled to localized Shiba states

Cited by 5 publications

References 42 publications

Study of the cavity-magnon-polariton transmission line shape

Study of the cavity-magnon-polariton transmission line shape

Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena

Cavity Photons as a Probe for Charge Relaxation Resistance and Photon Emission in a Quantum Dot Coupled to Normal and Superconducting Continua

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