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2022 Fiscal Year Final Research Report

THz-field-induced phase transition in strongly correlated insulators

Research Project

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Project/Area Number 20K03801
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionThe University of Tokyo

Principal Investigator

Miyamoto Tatsuya  東京大学, 大学院新領域創成科学研究科, 助教 (40755724)

Project Period (FY) 2020-04-01 – 2023-03-31
Keywordsテラヘルツ電場誘起相転移 / ポンプ-プローブ分光 / 強相関系 / 量子トンネル効果 / 絶縁体-金属転移
Outline of Final Research Achievements

A THz pump-broadband optical probe spectroscopy system using intense terahertz pulses with the electric field of over 3 MV/cm as a pump light has been developed. By applying the optical system to the strongly correlated insulators, i.e. the one-dimensional Mott insulator ET-F2TCNQ, the exciton insulator Ta2NiSe5 and the charge-ordered insulator Gd0.55Sr0.45MnO3, it was revealed that carriers are generated via the quantum tunneling effect induced by the THz electric field, resulting in an insulator-metal transition.

Free Research Field

固体の光物性

Academic Significance and Societal Importance of the Research Achievements

本研究で実証したテラヘルツ電場誘起絶縁体-金属転移は、光励起の場合と比較して高効率であった。そのため、テラヘルツパルスを利用した新しい動作原理を持つ省電力の光スイッチへの応用が期待される。また、量子トンネル過程に基づいたキャリア生成は、元素置換による化学的キャリアドープが困難な物質も含め、様々な強相関系物質にキャリアを注入する新しい手法として、広く利用できると考えている。

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Published: 2024-01-30  

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