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Evaporative electron cooling in asymmetric double barrier semiconductor heterostructures.

ABSTRACT: Rapid progress in high-speed, densely packed electronic/photonic devices has brought unprecedented benefits to our society. However, this technology trend has in reverse led to a tremendous increase in heat dissipation, which degrades device performance and lifetimes. The scientific and technological challenge henceforth lies in efficient cooling of such high-performance devices. Here, we report on evaporative electron cooling in asymmetric Aluminum Gallium Arsenide/Gallium Arsenide (AlGaAs/GaAs) double barrier heterostructures. Electron temperature, T_e, in the quantum well (QW) and that in the electrodes are determined from photoluminescence measurements. At 300?K, T_e in the QW is gradually decreased down to 250?K as the bias voltage is increased up to the maximum resonant tunneling condition, whereas T_e in the electrode remains unchanged. This behavior is explained in term of the evaporative cooling process and is quantitatively described by the quantum transport theory.

SUBMITTER: Yangui A

PROVIDER: S-EPMC6776518 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Evaporative electron cooling in asymmetric double barrier semiconductor heterostructures.

Yangui Aymen A Bescond Marc M Yan Tifei T Nagai Naomi N Hirakawa Kazuhiko K

Nature communications 20191003 1

Rapid progress in high-speed, densely packed electronic/photonic devices has brought unprecedented benefits to our society. However, this technology trend has in reverse led to a tremendous increase in heat dissipation, which degrades device performance and lifetimes. The scientific and technological challenge henceforth lies in efficient cooling of such high-performance devices. Here, we report on evaporative electron cooling in asymmetric Aluminum Gallium Arsenide/Gallium Arsenide (AlGaAs/GaAs ...[more]

PMID: 31582747

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Project description:Cryotherapy is the most common non-pharmacological pain-relieving method. The aim of this pilot study was to ascertain whether intranasal evaporative cooling may be an effective intervention in an acute migraine attack. Studies have previously demonstrated effectiveness of a variety of cryotherapy approaches. Intranasal evaporative cooling due to vascular anatomy, allows the transfer of venous blood from nasal and paranasal mucous membranes to the dura mater, thereby providing an excellent anatomical basis for the cooling processes.We conducted a prospective, open-label, observational, pilot study. Twenty-eight patients who satisfied the International Classification of Headache Disorders (ICHD 2) diagnostic criteria for migraine were recruited. A total of 20 treatments were administered in 15 patients. All patients provided pain severity scores and migraine-associated symptoms severity scores (based on a 0-10 visual analogue scale, [VAS]).Out of the 20 treatments, intranasal evaporative cooling rendered patients' pain and symptoms free immediately after treatment, in 8 of the treatments (40%), a further 10 treatments (50%) resulted in partial pain relief (headache reduced from severe or moderate to mild) and partial symptoms relief. At 2 hours, 9 treatments (45%) provided full pain and symptoms relief, with a further 9 treatments (45%) resulting in partial pain and symptoms relief. At 24 hours, 10 treatments (50%) resulted in patients reporting pain and symptom freedom and 3 (15%) provided partial pain relief. In summary 13 patients (87%) had benefit from the treatment within 2 hours that was sustained at 24 hours.Intranasal evaporative cooling gave considerable benefit to patients with migraine, improving headache severity and migraine-associated symptoms. A further randomised, placebo controlled, double blinded, parallel clinical trial is required to further investigate the potential of this application.Clinicaltrials.gov registered trial, ClinicalTrials.gov Identifier: NCT01898455.

Dataset Information

Evaporative electron cooling in asymmetric double barrier semiconductor heterostructures.

Publications

Evaporative electron cooling in asymmetric double barrier semiconductor heterostructures.

Similar Datasets

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