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METHOD AND DEVICE FOR EVALUATING TOPOLOGICAL INSULATION FROM SOLID SPIN CHARACTERISTICS

外国特許コード F180009370
整理番号 (S2016-1074-N0)
掲載日 2018年4月19日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP027375
国際公開番号 WO 2018042971
国際出願日 平成29年7月28日(2017.7.28)
国際公開日 平成30年3月8日(2018.3.8)
優先権データ
  • 特願2016-167744 (2016.8.30) JP
発明の名称 (英語) METHOD AND DEVICE FOR EVALUATING TOPOLOGICAL INSULATION FROM SOLID SPIN CHARACTERISTICS
発明の概要(英語) In the present invention, a femtosecond pulsed laser 4 is irradiated onto the surface of a solid sample 8 of a topological insulator as excitation light while the polarization state is changed through the rotation of a quarter-wave plate 6; a reverse Faraday effect or reverse Cotton-Mouton effect is induced on the surface of the solid sample 8; through the measurement of the quarter-wave-plate-angle dependency resulting from the effect, localized spin states on the surface of the solid sample 8 and surface band states are evaluated for a topological insulator, or the like; and topological insulation is evaluated.
特許請求の範囲(英語) [claim1]
1. The excitation light with a femtosecond laser pulses, λ/4 wavelength plate is rotated to change the polarization state of the solid-state of the solid sample topological insulator applied to the surface, the surface of a solid, inverse Faraday effect and reverse cotton, will induce one or both of Moutton effect, the effect generated based on a λ/4 measurement angle dependency of the half-wave plate rotator by, topological insulator located on the solid surface at the surface of the spin state and the evaluation of the band state was evaluated, evaluate the insulating topological and topological from solid as the spin characteristics of the method of evaluating the insulating property.
[claim2]
2. λ/4 is the dependency of the angle half-wave plate rotator, coherent spin or magnetizable M band structure and, with a femtosecond laser pulses delayed in time relative to the probe pulse with the detection light, an opaque solid sample is irradiated to the solid-state, magneto-optical effect by the reflected light to detect the rotation angle of the car using can be evaluated through according to claim 1 characterized in that the solid-state spin characteristics of topological from the method of evaluating the insulation.
[claim3]
3. By the Kerr rotation angle, after irradiation with a femtosecond laser pulses detected, the ultra-high speed of 1 pico seconds appearing time inverse Faraday effect or reverse cotton, causes a transient Moutton effect caused by the magnetization induced M spin detection according to claim 2 characterized in that the solid-state spin characteristics of the method of evaluating a topological from insulation.
[claim4]
4. λ/4 is the dependency of the angle half-wave plate rotator, coherent spin or magnetizable M band structure and, with a femtosecond laser pulses delayed in time relative to the probe pulse with the detection light, of a transparent solid sample is irradiated to the solid-state image, the irradiation of the light transmission type can be detected by the angle of Faraday rotation of, characterized in that the evaluation according to claim 1 topological from the solid-state spin characteristics of a method for evaluating the insulating property.
[claim5]
5. The inverse Faraday effect is, femtosecond laser pulses to circularly polarized light irradiating the surface of the solid-state induced in any one of claims 1-4 characterized in that the solid insulation as the spin characteristics of the method of evaluating a topological from.
[claim6]
6. Reverse cotton, Moutton effect, femtosecond laser pulses into linearly polarized light is irradiated on the surface of the solid-state induced in any one of claims 1-4 characterized in that the solid insulation as the spin characteristics of the method of evaluating a topological from.
[claim7]
7. λ/4 Kerr rotation angle of the Faraday rotation angle or a quarter-wave by measuring a rotation angle α dependency, reverse L cotton, Moutton effect when Kerr rotation amplitude indicative, Lsin4 α component presence or absence of any one of claims 2-5 characterized in that the solid insulation as the spin characteristics of the method of evaluating the topological from.
[claim8]
8. The excitation light with a femtosecond laser pulses, λ/4 by rotating the wavelength plate changing the polarization state of the laser light is irradiated to the solid surface at a topological insulator, the surface of a solid, inverse Faraday effect and reverse cotton, will induce one or both of Moutton effect, the effect generated based on a λ/4 half-wave plate rotator by measuring angle dependency, topological solid as the spin characteristics of the method of evaluating the insulation from the apparatus and, femtosecond pulsed laser beam from the excitation light and the detection light is divided into three division device and 2, to change the state of polarization of the excitation light wavelength plate is λ/4, p to p-polarized light detection light and a polarizing plate, a solid sample and detecting light reflected from the mirror and further reflected, the light reflected from the mirror and the horizontal polarization to vertical polarization demultiplexing demultiplexes the polarizing beam splitter and, the vertical polarization and horizontal polarization and the light detector respectively, characterized in that it comprises a device for evaluating a topological insulating properties.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • UNIVERSITY OF TSUKUBA
  • NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
  • 発明者(英語)
  • HASE MUNEAKI
  • MONDAL RICHARJ
  • AIHARA YUKI
  • SAITO YUTA
  • TOMINAGA JUNJI
国際特許分類(IPC)
指定国 (WO201842971)
National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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