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Luo, Chih‐Wei; Chen, M. H.; Chen, S. P.; Wu, Kaung‐Hsiung; Juang, Jenh‐Yih; Lin, Jiunn‐Yuan; Uen, T. M.; Gou, Y. S.

doi:10.1103/physrevb.68.220508

Cited by 19 publications

(7 citation statements)

References 27 publications

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“…The average photon absorption rate hence is in the range of one photon per 1.6-19 μs. This time interval is approximately six orders of magnitude longer than the quasiparticle recombination time, τ r = 3-10 ps, in optimally doped YBCO thin films on STO substrates or single-crystal samples 49,50 . The perturbation caused by the absorption of a photon will thus decay long before a subsequent photon will be absorbed in the nanowire.…”

Section: Resultsmentioning

confidence: 87%

Energy-level quantization and single-photon control of phase slips in YBa2Cu3O7–x nanowires

et al. 2020

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Significant progress has been made in superconducting quantum circuits. However new quantum devices that have longer decoherence times at higher temperatures are urgently required for quantum technologies. Superconducting nanowires with quantum phase slips are promising candidates for use in novel quantum devices. Here, we demonstrate YBa 2 Cu 3 O 7-x nanowires with phase-slip dynamics and study their switching-current statistics at temperatures below 20 K. We apply theoretical models developed for Josephson junctions and show that our results provide strong evidence for energy-level quantization in the nanowires. The crossover temperature to the quantum regime of 12-13 K and the lifetime in the excited state exceeding 20 ms at 5.4 K are superior to those in conventional Josephson junctions. We also show how the absorption of a single photon changes the phase-slip and quantum state of a nanowire, which is important for the development of single-photon detectors with high operating temperature and superior temporal resolution.

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Section: Resultsmentioning

confidence: 87%

Energy-level quantization and single-photon control of phase slips in YBa2Cu3O7–x nanowires

et al. 2020

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“…In the literature, this difference is known to manifest the nematicity of the electronic structure. For example, the anisotropic single-particle and collective excitations in the quasi-1D charge-density wave semiconductor K 0.3 MoO 3 37 and the d-wave symmetry of the superconducting gap in cuprate superconductors YBCO [38][39][40][41] have been unambiguously revealed by polarized pump-probe spectroscopy. As intriguingly, the orientation anisotropy is shown also in τ 1 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…ΔR/R(t, pump, probe) curves along various orientations on the surface of the sample were obtained on rotating the polarization of pulses at nearly normal incidence (pump ~ 0°, probe ~ 7°). The intensity and polarization (electric field, E) of pulses were adjusted with a λ/2 plate and polarizer [38][39][40][41] . Moreover, the penetration depth of FeSe is ~ 24 nm for 400 nm and ~30 nm for 800 nm, which are estimated from the skin depth of electromagnetic wave in metal, λ/4k 11 .…”

Section: Methodsmentioning

confidence: 99%

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Unveiling the hidden nematicity and spin subsystem in FeSe

et al. 2017

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The nematic order (nematicity) is considered as one of the essential ingredients to understand the mechanism of Fe-based superconductivity. In most Fe-based superconductors (pnictides), nematic order is reasonably close to the antiferromagnetic order. In FeSe, in contrast, a nematic order emerges below the structure phase transition at T s = 90 K with no magnetic order. The case of FeSe is of paramount importance to a universal picture of Fe-based superconductors. The polarized ultrafast spectroscopy provides a tool to probe simultaneously the electronic structure and the magnetic interactions through quasiparticle dynamics. Here we show that this approach reveals both the electronic and magnetic nematicity below and, surprisingly, its fluctuations far above T s to at least 200 K. The quantitative pump-probe data clearly identify a correlation between the topology of the Fermi surface and the magnetism in all temperature regimes, thus providing profound insight into the driving factors of nematicity in FeSe and the origin of its uniqueness.

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“…Thus, the pump pulses cannot be diffracted by the transient grating established by the interference between pump and probe pulses and no coherence spike in ΔR/R. In some experiments small θ pump and θ probe are needed to be set for the angle-resolved ultrafast spectroscopy in anisotropic materials such as high-T c superconductor, YBa 2 Cu 3 O 7−δ , by varying the polarizations of pump and probe pulses [10]- [12]. If the θ pump and θ probe must be fixed in small angle, the coherent spike in ΔR/R could be removed by increasing the interval of delay time.…”

Section: Resultsmentioning

confidence: 99%

Eliminate coherence spike in reflection-type pump-probe measurements

Luo¹,

Wang²,

Chen³

et al. 2009

Opt. Express

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The coherence spike of femtosecond laser pulses in the reflection-type pump-probe measurements has been systematically studied in the semiconductor (100) InP. By varying the setup of the pump-probe measuring system, i.e. the polarizations of pump and probe pulses, the incident angles of pump and probe beams, and the interval of delay time between pump and probe pulses, the dramatic changes in the strength of coherence spike could be clear observed. Furthermore, the proposed methods to remove the coherence spike from the transient reflectivity curves have been demonstrated in the time-domain measurements.

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Spatial symmetry of the superconducting gap ofYBa2Cu3O7

Cited by 19 publications

References 27 publications

Energy-level quantization and single-photon control of phase slips in YBa2Cu3O7–x nanowires

Energy-level quantization and single-photon control of phase slips in YBa2Cu3O7–x nanowires

Unveiling the hidden nematicity and spin subsystem in FeSe

Eliminate coherence spike in reflection-type pump-probe measurements

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