Rydberg excitons in synthetic cuprous oxide 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi></mml:math>

Lynch, Stephen Anthony; Hodges, Chris; Mandal, Soumen; Langbein, Wolfgang Werner; Singh, R. P.; Gallagher, Liam A. P.; Pritchett, Jon D.; Pizzey, Danielle; Rogers, Joshua; Adams, Charles S.; Jones, Mike I

doi:10.1103/physrevmaterials.5.084602

Cited by 21 publications

(6 citation statements)

References 63 publications

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“…Any residual charges created by the neutralization process should then become detectable. Our results represent an important step towards controlling detrimental charge noise, will elevate the role of Cu 2 O as a platform for quantum technologies 19 , 51 – 57 and may open up the possibility to perform ultracold chemistry-like analogy experiments 58 in semiconductors.…”

Section: Discussionmentioning

confidence: 81%

“…Purification builds up during a time scale τ 1 when the pump beam arrives and decays exponentially during a time scale τ 2 when the pump beam is switched off. These time scales are in the microsecond range and are significantly longer than the lifetimes of Rydberg excitons, so they indicate the presence of another type of long-lived carriers in the system: charged impurities 19 , 31 – 33 . Most importantly, the data at intermediate pump densities shows that blockade and purification are independent effects and may happen simultaneously.…”

Section: Resultsmentioning

confidence: 99%

“…Their linewidths scale as n −3 , while their polarizability in external fields even scales as n 7 13 , resulting in a strong sensitivity to external fields 14 – 17 . The predominant defects in natural Cu 2 O are deep and positively charged oxygen vacancies with binding energies of several hundred meV 18 , 19 , which can be understood as Coulomb-like static electric potentials in the crystal. The influence of such charged impurities on the Rydberg exciton spectrum in a bulk medium has been studied theoretically in detail for Cu 2 O 20 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large scale purification in semiconductors using Rydberg excitons

Bergen,

Walther,

Panda

et al. 2023

Nat Commun

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Improving the quantum coherence of solid-state systems is a decisive factor in realizing solid-state quantum technologies. The key to optimize quantum coherence lies in reducing the detrimental influence of noise sources such as spin noise and charge noise. Here we demonstrate that we can utilize highly-excited Rydberg excitons to neutralize charged impurities in the semiconductor Cuprous Oxide - an effect we call purification. Purification reduces detrimental electrical stray fields drastically. We observe that the absorption of the purified crystal increases by up to 25% and that the purification effect is long-lived and may persist for hundreds of microseconds or even longer. We investigate the interaction between Rydberg excitons and impurities and find that it is long-ranged and based on charge-induced dipole interactions. Using a time-resolved pump-probe technique, we can discriminate purification from Rydberg blockade, which has been a long-standing goal in excitonic Rydberg systems.

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Section: Discussionmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large scale purification in semiconductors using Rydberg excitons

Bergen,

Walther,

Panda

et al. 2023

Nat Commun

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“…Our cavity containing a natural Cu 2 O sample is cooled down to 4 K in a continuous flow liquid Helium cryostat. Natural Cu 2 O crystals are employed here since these are of higher quality than artificially grown samples 19 , 48 . To prepare the microcavity sample, the Cu 2 O flake was first cleaned in xylene with 1 min of delicate sonication and rinsed in isopropanol.…”

Section: Methodsmentioning

confidence: 99%

Nonlinear Rydberg exciton-polaritons in Cu2O microcavities

Makhonin,

Delphan,

Song

et al. 2024

Light Sci Appl

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Rydberg excitons (analogues of Rydberg atoms in condensed matter systems) are highly excited bound electron-hole states with large Bohr radii. The interaction between them as well as exciton coupling to light may lead to strong optical nonlinearity, with applications in sensing and quantum information processing. Here, we achieve strong effective photon–photon interactions (Kerr-like optical nonlinearity) via the Rydberg blockade phenomenon and the hybridisation of excitons and photons forming polaritons in a Cu2O-filled microresonator. Under pulsed resonant excitation polariton resonance frequencies are renormalised due to the reduction of the photon-exciton coupling with increasing exciton density. Theoretical analysis shows that the Rydberg blockade plays a major role in the experimentally observed scaling of the polariton nonlinearity coefficient as ∝ n4.4±1.8 for principal quantum numbers up to n = 7. Such high principal quantum numbers studied in a polariton system for the first time are essential for realisation of high Rydberg optical nonlinearities, which paves the way towards quantum optical applications and fundamental studies of strongly correlated photonic (polaritonic) states in a solid state system.

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“…However, a growing number of studies have been conducted on synthetic samples. Cu 2 O synthesis is well established for applications such as electronics and energy storage [36][37][38] , but the growth of high-purity, crystalline Cu 2 O films which can support highly excited Rydberg states has been the subject of many recent studies, where states up to n = 10 have been observed [39][40][41] . These studies not only promise to realize Cu 2 O's potential for scalability but also allow excitons to be coupled to on-chip nanophotonic circuits.…”

Section: Introductionmentioning

confidence: 99%

Highly-Excited Rydberg Excitons in Synthetic Thin-Film Cuprous Oxide

Jacob

Barua

Ohadi

et al. 2023

Preprint

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Cuprous oxide (Cu2O) has recently been proposed as a promising solid-state host for excitonic Rydberg states with large principal quantum numbers (n) whose exaggerated wavefunction sizes (∝ n2 ) facilitate gigantic dipole-dipole (∝ n4) and van der Waals (∝ n11) interactions, making them an ideal basis for solid-state quantum technology. Synthetic, thin-film Cu2O samples are of particular interest because they can be made defect-free via carefully controlled fabrication and are, in principle, suitable for the observation of extreme single-photon nonlinearities caused by Rydberg blockade. In this study, we demonstrate the successful synthesis of nanometer-scale thin films of Cu2O on a transparent substrate and present evidence for the presence of Rydberg excitons up to n = 8. These results represent a significant step towards the development of scalable and integrable Rydberg-based quantum devices on a chip.

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Rydberg excitons in synthetic cuprous oxide Cu2O

Cited by 21 publications

References 63 publications

Large scale purification in semiconductors using Rydberg excitons

Large scale purification in semiconductors using Rydberg excitons

Nonlinear Rydberg exciton-polaritons in Cu2O microcavities

Highly-Excited Rydberg Excitons in Synthetic Thin-Film Cuprous Oxide

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