THz emission from intrinsic Josephson junctions under the layer parallel magnetic field

2014 Fiscal Year Final Research Report

• Project/Area Number: 24510181
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Microdevices/Nanodevices
• Research Institution: National Institute for Materials Science
• Principal Investigator: HATANO Takeshi 独立行政法人物質・材料研究機構, 超伝導物性ユニット, グループリーダー (50354337)
• Co-Investigator(Kenkyū-buntansha): WANG Huabing 独立行政法人物質・材料研究機構, 超伝導物性ユニット, 主幹研究員 (70421427)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 固有ジョセフソン接合 / 空洞共振 / テラヘルツ / 交流ジョセフソン効果 / ビスマス系高温超伝導体

Outline of Final Research Achievements

High-Tc superconducting oxides have layered Perovskite crystal structures. Among these, in highly anisotropic Bi2Sr2CaCu2O8+, “superconducting” CuO2 double layers are interleaved with “insulating” SrO-BiO-BiO-SrO layers. Such an alternating layered structure was found to exhibit a “Josephson effect”. Namely, a device structure is naturally embedded in the crystals. The number of Josephson junctions in a crystal having a thickness of 1 μm is as much as 650, which can never be realized by a thin film fabrication technique.
Furthermore, the energy gap of a high-Tc superconductor is one order larger than that of a conventional metal superconductor (Nb), which results in the generation of a one order higher frequency microwave becoming possible, i. e. from 1 THz to 10 THz from the enormous number of junctions in the array. Thus, one can expect a powerful THz generation from a Bi2Sr2CaCu2O8+d single crystal.

Free Research Field

超伝導物性