Lumped element kinetic inductance detectors based on two-gap MgB2 thin films

被引：14

作者：

Yang, C. ^{[1
]}

Niu, R. R. ^{[1
]}

Guo, Z. S. ^{[1
]}

Cai, X. W. ^{[1
]}

Chu, H. M. ^{[2
]}

Yang, K. ^{[2
]}

Wang, Y. ^{[1
]}

Feng, Q. R. ^{[1
]}

Gan, Z. Z. ^{[1
]}

机构：

[1] Peking Univ, Sch Phys, Appl Superconduct Res Ctr, State Key Lab Artificial Microstruct & Mesoscop P, Beijing 100871, Peoples R China

[2] Univ Elect Sci & Technol China, Inst Astronaut & Aeronaut, Chengdu 611731, Sichuan, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2018年 / 112卷 / 02期

基金：

中国国家自然科学基金;

关键词：

ARRAYS;

D O I：

10.1063/1.5013286

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Lumped element kinetic inductance detectors (LEKIDs) are made from a single layer superconducting thin film. Because of their low noise and highly multiplexibility, LEKIDs provide a sensitive technology for the detection of millimeter and submillimeter waves. In this work, a 5-pixel 50-nm-thick MgB2 array is made. The microwave properties of the array are measured under dark conditions. We show that the loaded quality factor Q of the resonant circuit is 30 000 at 7.5K, which is comparable to that of lower-operating-temperature (usually several hundred mK) LEKIDs made from superconductors such as Al and Nb. Moreover, the temperature dependence of resonance frequency gives the two-gap character of MgB2, Delta(pi) (0) = 2.58 meV and Delta(o) (0) = 8.26 meV. The gap frequency (f = 2 Delta/h) indicates that MgB2 LEKIDs have a promising application on terahertz detection. Published by AIP Publishing.

引用

页数：5

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