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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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  • 談話会・セミナー
  • 【教養学部生対象】物理工学科見学会のお知らせ[12/15(土)]
    2018.12.13
  •  
  • 教養学部生を対象とした物理工学科見学会を開催しますので、興味のある方は是非ご参加下さい。
    事前申し込みは不要です。

    日  時:平成30年12月15日(土)14:00-16:15
    集合場所:本郷キャンパス工学部6号館1階大会議室
    プログラム:
    14:00-14:15 学科紹介(学科長 求幸年教授)
    14:15-15:15 研究室見学
    石坂研究室 – 光で拓く物質科学 -   
    石渡研究室 – 極限環境を利用した強相関物質の開拓 –
    賀川研究室 – 非平衡状態を活用した物性・機能開拓 –
    15:15-16:15 先輩学生との懇親会
    (10名程度の大学院生が参加予定)

    物理工学科見学会ポスター(PDF)

  • 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)

お知らせ
  • 【教養学部生対象】物理工学科見学会のお知らせ[12/15(土)]
    2018.12.13
  •  
  • 教養学部生を対象とした物理工学科見学会を開催しますので、興味のある方は是非ご参加下さい。
    事前申し込みは不要です。

    日  時:平成30年12月15日(土)14:00-16:15
    集合場所:本郷キャンパス工学部6号館1階大会議室
    プログラム:
    14:00-14:15 学科紹介(学科長 求幸年教授)
    14:15-15:15 研究室見学
    石坂研究室 – 光で拓く物質科学 -   
    石渡研究室 – 極限環境を利用した強相関物質の開拓 –
    賀川研究室 – 非平衡状態を活用した物性・機能開拓 –
    15:15-16:15 先輩学生との懇親会
    (10名程度の大学院生が参加予定)

    物理工学科見学会ポスター(PDF)

  • 教員公募のお知らせ(応募締切:2018/12/17)
    2018.11.20
  •  
  • 物理工学専攻では、このたび助教1名を公募いたします。本公募の詳細についてはこちらをご覧ください。

もっと詳しく

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)

  • もっと詳しく

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