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Your search keyword '"You, Li-Xing"' showing total 13 results
Start Over Author "You, Li-Xing" Publisher iop publishing
13 results on '"You, Li-Xing"'

3. Photon number resolvability of multi-pixel superconducting nanowire single photon detectors using a single flux quantum circuit.

Author

Zhou, Hou-Rong, Cheng, Kun-Jie, Ren, Jie, You, Li-Xing, Ying, Li-Liang, Yang, Xiao-Yan, Li, Hao, and Wang, Zhen

Subjects
PHOTON detectors, NANOWIRES, MUTUAL inductance, ELECTRONIC systems, MAGNETIC flux, PHOTON counting, PHOTONS
Abstract

Superconducting nanowire single-photon detectors (SNSPDs) are typical switching devices capable of detecting single photons with almost 100% detection efficiency. However, they cannot determine the exact number of incident photons during a detection event. Multi-pixel SNSPDs employing multiple read-out channels can provide photon number resolvability (PNR), but they require increased cooling power and costly multi-channel electronic systems. In this work, a single-flux quantum (SFQ) circuit is employed, and PNR based on multi-pixel SNSPDs is successfully demonstrated. A multi-input magnetically coupled DC/SFQ converter (MMD2Q) circuit with a mutual inductance M is used to combine and record signals from a multi-pixel SNSPD device. The designed circuit is capable of discriminating the amplitude of the combined signals in accuracy of Φ 0/ M with Φ 0 being a single magnetic flux quantum. By employing the MMD2Q circuit, the discrimination of up to 40 photons can be simulated. A 4-parallel-input MMD2Q circuit is fabricated, and a PNR of 3 is successfully demonstrated for an SNSPD array with one channel reserved for the functional verification. The results confirm that an MMD2Q circuit is an effective tool for implementing PNR with multi-pixel SNSPDs. [ABSTRACT FROM AUTHOR]

Published
2022
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8. Injection Efficiency of Spin-Polarized Quasi-particles in Y-Ba-Cu-O Thin Film

Author

Zhang Shi-Yuan, XU Wei-Wei, You Li-Xing, Yang Ming, Cao Chun-Hai, Cui Xu-Gao, Yang Sen-Zu, Kang Lin, and JI Zheng-Ming

Subjects
Superconductivity, Materials science, Condensed matter physics, Spin diffusion, General Physics and Astronomy, Heterojunction, Critical current, Current (fluid), Thin film, Quasi particles, Spin-½
Abstract

The injection efficiency of spin-polarized quasi-particles in a superconducting Y-Ba-Cu-O (YBCO) film is investigated by means of current injection into the Nd0.7Sr0.3MnO3/SrTiO3/YBa2Cu3O7-δ heterostructures. We have successfully prepared six injection junction windows in the YBCO thin film strip, which are all 56 µm wide, but 80 µm, 40 µm, 20 µm, 10 µm, 5 µm, and 2 µm long, respectively. At 16 K, our YBCO thin film strip (80 nm thick) has Jc = 2×105A/cm2. Under the spin-polarized injection current of Iinj = 0.5 mA, with decreasing injection junction length L, injection efficiency η (η≡ΔJc/ΔJinj; ΔJc: the suppression of critical current density due to finite ΔJinj) increases gradually, until L is not more than 20 µm. In that case, η hardly varies with the change of L, reaching up to about 6. We think that these results are related to the spin diffusion length of spin-polarized quasi-particles in the superconducting thin film. In our heterostructures, the YBCO thin film keeps good superconductivity and the injection junction windows are of proper size, therefore, we have obtained relatively high injection efficiency of spin-polarized quasi-particles.

Published
2003
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9. Modification of a YBa2Cu3O7-$\delta$ Thin Film Using an Atomic Force Microscope

Author

Yang Sen-Zu, Kang Lin, Wu Pei-Heng, Yin Xiao-Bo, You Li-Xing, Wang Mu, and Feng Yi-Jun

Subjects
Superconductivity, Materials science, Condensed matter physics, business.industry, Atomic force microscopy, Energy-dispersive X-ray spectroscopy, General Physics and Astronomy, Biasing, Oxygen deficiency, Optics, Condensed Matter::Superconductivity, Electric field, Ridge (meteorology), Thin film, business
Abstract

A YBa2Cu3O7-δ thin film is modified by a probe electric field of an atomic force microscope to form a ridge with the width of only a grain cell. The modification varies with the operation parameters of the bias voltage, the moving velocity of the probe and the ambient humidity. Energy dispersive spectroscopy analysis shows only oxygen deficiency in the modified YBCO thin film. As a result, the suppressed superconductivity was found in the junction crossing the ridge.

Published
2002
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