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駒場生の皆さん、物理工学科へぜひお越しください。

駒場生の皆さん、物理工学科へぜひお越しください。

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  • 【大学院入学希望者対象】2020年度 物理工学専攻 大学院入試説明会[6/15(土)]
    2019.03.15
  •  
  • 2020年度大学院入試説明会及び研究室見学会を下記の通り開催します。物理工学専攻に興味のある方はぜひご参加下さい。(事前申込不要)

    日  時:2019年6月15日(土)13:00より
    場  所:本郷キャンパス 工学部6号館3階セミナー室A
    当日の予定:
        13:00~ 専攻紹介、入試の説明
        13:20~ 研究所の紹介〔物性研究所,生産技術研究所〕
        13:50~ オープンハウス形式の研究室見学会(17:00頃終了予定)

  • 第7回 物理工学科教室談話会(講師:Prof. Natalia Drichko)
    2019.01.18
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  • 日時:2019年 1月25日(金) 16:00~
    場所:工学部6号館3階372号室(セミナー室C)

    講師:Prof. Natalia Drichko
    所属:The Johns Hopkins University, Baltimore, USA
    題目:Signatures of quantum dipole liquid in an organic Mott insulator.

    概要:
    Mott insulators are commonly pictured with electrons localized on lattice sites. Their low-energy physics involves spins only. Recent theoretical work suggests that in molecular systems a new on-site charge degree of freedom can emerge. On a frustrated lattice with charge-spin coupling it would result in a new quantum spin liquid state. We experimentally demonstrate a presence of a charge degree of freedom in molecule-based Mott insulators k-(BEDT-TTF)2Hg(SCN)2X (X=Br,Cl).
    In k-(BEDT-TTF)2Hg(SCN)2Br, when electrons localize on a triangular lattice of molecular dimers at temperatures below 100 K, they form electric dipoles which do not order at low temperatures and fluctuate, resulting in a so-called quantum dipole liquid state. A frequency of dipole fluctuations of 1.3 THz is detected experimentally in our Raman spectroscopy experiments through an observation of a related collective mode [1]. Magnetic properties of the system are currently investigated.
    In k-(BEDT-TTF)2Hg(SCN)2Cl, electric dipoles order on dimer sites below 30 K. However, we demonstrate that below 15 K this charge order starts to melt, and the material shows paramagnetic behavior down to at least 2 K, suggestive of a spin liquid state.
    We show that Raman spectroscopic response of Mott insulators with an on-site charge degree of freedom is different from the response of simple dimer Mott insulators. Raman spectra of the latter show two-magnon excitations at frequencies below 500 cm-1 expected for a S=1/2 antiferromagnet on a triangular lattice with J≈250 K [2]. Our results can be a key to understanding of organic triangular lattice spin liquid candidates.

    [1] N. Hassan et al. Science 360, 1101 (2018).
    [2] N. Hassan et al. Crystals 8, 233 (2018).

    紹介教員:鹿野田 一司 教授(物理工学専攻)、賀川 史敬 准教授(物理工学専攻)

お知らせ
  • 【大学院入学希望者対象】2020年度 物理工学専攻 大学院入試説明会[6/15(土)]
    2019.03.15
  •  
  • 2020年度大学院入試説明会及び研究室見学会を下記の通り開催します。物理工学専攻に興味のある方はぜひご参加下さい。(事前申込不要)

    日  時:2019年6月15日(土)13:00より
    場  所:本郷キャンパス 工学部6号館3階セミナー室A
    当日の予定:
        13:00~ 専攻紹介、入試の説明
        13:20~ 研究所の紹介〔物性研究所,生産技術研究所〕
        13:50~ オープンハウス形式の研究室見学会(17:00頃終了予定)

  • 賀川 史敬 准教授 第40回本多記念研究奨励賞受賞
    2019.02.25
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  • 物理工学専攻の賀川史敬准教授が、第40回本多記念研究奨励賞を受賞しました。本賞は、理工学特に金属及びその周辺材料に関連する研究を行い、優れた研究成果、または、発明を行った者で、将来の発展を期待できる若い研究者に贈呈されるものです。
    受賞の対象となった研究成果は、「急冷を用いた電荷ガラス相の開拓とその不揮発相制御に関する研究」です。贈呈式は2019年5月31日(金)午後1時20分より、学士会館(東京都千代田区神田錦町)にて行われる予定です。

    ・公益財団法人 本多記念会

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談話会・セミナー
  • 第7回 物理工学科教室談話会(講師:Prof. Natalia Drichko)
    2019.01.18
  •  
  • 日時:2019年 1月25日(金) 16:00~
    場所:工学部6号館3階372号室(セミナー室C)

    講師:Prof. Natalia Drichko
    所属:The Johns Hopkins University, Baltimore, USA
    題目:Signatures of quantum dipole liquid in an organic Mott insulator.

    概要:
    Mott insulators are commonly pictured with electrons localized on lattice sites. Their low-energy physics involves spins only. Recent theoretical work suggests that in molecular systems a new on-site charge degree of freedom can emerge. On a frustrated lattice with charge-spin coupling it would result in a new quantum spin liquid state. We experimentally demonstrate a presence of a charge degree of freedom in molecule-based Mott insulators k-(BEDT-TTF)2Hg(SCN)2X (X=Br,Cl).
    In k-(BEDT-TTF)2Hg(SCN)2Br, when electrons localize on a triangular lattice of molecular dimers at temperatures below 100 K, they form electric dipoles which do not order at low temperatures and fluctuate, resulting in a so-called quantum dipole liquid state. A frequency of dipole fluctuations of 1.3 THz is detected experimentally in our Raman spectroscopy experiments through an observation of a related collective mode [1]. Magnetic properties of the system are currently investigated.
    In k-(BEDT-TTF)2Hg(SCN)2Cl, electric dipoles order on dimer sites below 30 K. However, we demonstrate that below 15 K this charge order starts to melt, and the material shows paramagnetic behavior down to at least 2 K, suggestive of a spin liquid state.
    We show that Raman spectroscopic response of Mott insulators with an on-site charge degree of freedom is different from the response of simple dimer Mott insulators. Raman spectra of the latter show two-magnon excitations at frequencies below 500 cm-1 expected for a S=1/2 antiferromagnet on a triangular lattice with J≈250 K [2]. Our results can be a key to understanding of organic triangular lattice spin liquid candidates.

    [1] N. Hassan et al. Science 360, 1101 (2018).
    [2] N. Hassan et al. Crystals 8, 233 (2018).

    紹介教員:鹿野田 一司 教授(物理工学専攻)、賀川 史敬 准教授(物理工学専攻)

  • もっと詳しく
  • 第6回 物理工学科教室談話会(講師:Prof. Daniel Khomskii)
    2019.01.04
  •  
  • 日時:2019年 1月16日(水) 14:00~
    場所:工学部6号館1階103号室(大会議室)

    講師:Prof. Daniel Khomskii
    所属:II.Physikalisches Institut, Universitaet zu Koeln, Germany
    題目:Negative charge transfer gaps and ligand holes: Oxides vs peroxides

    概要:
    In this talk I will discuss some effects occurring in transition metal compounds with small or negative charge transfer gap and with large contribution of ligand (e.g. oxygen) holes. In this case, when a lot of holes are transferred to oxygens (or in general to ligands, e.g. S, Se, Te) one of the options is that instead of the usual oxides, like say Ti4+(O2-)2 one could form peroxides, e.g. with pyrite structure, such as for example Mg2+(O2)2- or Fe2+(S2)2-. This is a very interesting class of compounds, having nontrivial magnetic and sometimes orbital properties. Specifically we consider the recently synthesized material FeO2 [1], which, according to our theoretical calculations [2], is a system “in between” the usual dioxides like TiO2, VO2, and peroxides M2+(O2)2- : in FeO2 the valence of Fe is neither 4+ as in dioxides nor 2+ as in pyrite, but 3+. This specific material can play a very important role in the physics of the deep Earths mantle, especially at the early stages of the Earths history. Ligand holes and anion bonding also plays significant role in the properties of gold telluride AuTe2 – one of rare cases of minerals with incommensurate crystal structure [3]. Peroxides can also be important ingredients in the attempts to make better cathode materials for rechargeable batteries, and in many other applications.
    [1] Hu, Q. et al. ‘’FeO2 and FeOOH under deep lower-mantle conditions and Earth’s oxygen–hydrogen cycles’’, Nature 534, 241–244 (2016).
    [2] S.V. Streltsov, A.O. Shorikov, S.L. Skornyakov, A.I. Poteryaev, D.I. Khomskii, ‘’ Unexpected 3+ valence of iron in FeO2 , a geologically important material lying “in between” oxides and peroxides ‘’, Sci. Rep. 7, 13005 (2017)
    [3] S.V. Streltsov, V.V. Roizen, A.V. Ushakov, A.R. Oganov, and D. I. Khomskii, “Solving the old puzzle of incommensurate crystal structure of calaverite AuTe2 and predicted stability of novel AuTe compound ”, Proc. Natl. Acad. Sci. USA, 115, 9945-9950 (2018)

    紹介教員:求幸年教授(物理工学専攻)、石渡晋太郎准教授(物理工学専攻)

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