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Statistical evaluation of 571 GaAs quantum point contact transistors showing the 0.7 anomaly in quantized conductance using cryogenic on-chip multiplexing

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Chip 2024年第3期3卷 21-28页

作者： Pengcheng Ma k.veh Delfanazari Reuben k.Puddy Jiahui Li moda Cao teng Yi Jonathan P.Griffiths Harvey E.Beere David A.Ritchie Michael J.k.lly Charles G.Smith Cavendish Laboratory Department of PhysicsUniversity of CambridgeCambridge CB30HEUK James Watt School of Engineering University of GlasgowGlasgow G128QQUK Electrical Engineering Division University of CambridgeCambridge CB30FAUK

themass production and the practical number of cryogenic quantum devices producible in a single chip are limited to the number of electrical contact pads and wiring of the cryostat or dilution *** is,therefore,beneficial to contrast themeasurements of hundreds of devices fabricated in a single chip in one cooldown process to promote the scalability,integrability,reliability,and reproducibility of quantum devices and to save evaluation time,cost and ***,we used a cryogenic on-chip multiplexer architecture and investigated the statistics of the 0.7 anomaly observed on the first three plateaus of the quantized conductance of semiconductor quantum point contact(QPC)*** single chips contain 256 split gate field-effect QPC transistors(QFEt)each,with two 16-branch multiplexed source-drain and gate pads,allowing individual transistors to be selected,addressed and controlled through an electrostatic gate voltage process.A total of 1280 quantum transistors with nano-scale dimensions are patterned in 5 different chips of GaAs *** the measurements of 571 functioning QFEts tak.n at temperatures t[1.4 k.and t[40 mk.it is found that the spontaneous polarisation model and k.ndo effect do not fit our ***,some of the features in our data largely agreed with van Hove model with short-range *** approach provides further insight into the quantum mechanical properties and microscopic origin of the 0.7 anomaly in QFEts,paving the way for the development of semiconducting quantum circuits and integrated cryogenic electronics,for scalable quantum logic control,readout,synthesis,and processing applications.

关键词： Cryogenic chip Cryogenic quantum multiplexer Semi-conductor quantum integrated circuit Quantumﬁeld effect transistors Quantum point contacts Chip-scale cryogenic electronics

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远视与原发性高血压的关系

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世界核心医学期刊文摘(眼科学分册) 2006年第1期 8-9页

作者： k.radayi k. Ak.n t. Ciftci F. 陈立军 Emin Onat sk.7/4 34710 Moda-stanbul Turkey Dr

PURPOSE: to explore the relationship between the refractive state of the eye and high blood pressure in a representative population. DESIGN: Case-control study. MEtHODS: three hundred twenty-one patients with essential hypertension (mean age 53.9± 15.5 years) and 188 age-matched and sex-matched healthy control subjects (mean age 50.9± 7.3 years) from the same regional Health Maintenance Organization were consecutively included for the study (P > .05 for age and sex). the refractive state of the eyes was identified objectively by an autorefractometer and retinoscopic examination, recording the autorefractometer values. Spherical equivalents between-0.50 (included) and+ 0.50 (included) diopters were regarded as emmetropia. Values below or above this interval were regarded as either myopia or hypermetropia. Mean spherical equivalents of the groups were compared using independent samples t test; distributions of refraction were compared with χ 2 test. RESULtS: the mean spherical equivalent of the patients with essential hypertension was+ 0.88± 1.34 diopters (range-3.75 to+ 6.38 diopt-ers), whereas the mean spherical equivalent of the control subjects was-0.26± 1.12 diopters (range-5.00 to + 3.38 diopters) (Ptensive patients were hypermetropic, 18.1% of normotensive patients were hypermetropic (P there is a strong association of essential arterial hypertension with hypermetropia, which has not been previously reported. Given the findings of this study, we recommend that patientswho have hypermetropia and have had no recent systemic examination should at least have their blood pressure check.d.

关键词：等量球镜原发性高血压患者

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