2013年度(平成25年度)

コース名  物理学コース

領域名   量子多体系物理学

教員名   太田 幸則

電子メール ohtafaculty.chiba-u.jp

      ※メール送信の際は、「理」を半角@に変更してください。

 

1)研究論文などのリスト

原著論文

1.       Ground-State Phase Diagram of the Asymmetric Hubbard Model with Geometrical Frustration, S. Yamaki, K. Seki, and Y. Ohta, Phys. Rev. B 87, 125112/1-6 (2013).

2.       Antiferromagnetic Topological Insulator State in the Correlated Bernevig-Hughes-Zhang Model, S. Miyakoshi and Y. Ohta, Phys. Rev. B 87, 195133/1-6 (2013).

3.       Quasiparticle States in the Antiferromagnetic Phase of Double Exchange Systems, K. Nakano, R. Eder, Y. Ohta, and P. Wróbel, Eur. Phys. J. B 86, 314/1-10 (2013).

4.       Exact-Diagonalization Study of Exciton Condensation in Electron Bilayers, T. Kaneko, S. Ejima, H. Fehske, and Y. Ohta, Phys. Rev. B 88, 035312/1-5 (2013).

5.       Magnetic Properties and Mott Transition in the Hubbard Model on the Square Lattice with Frustration, A. Yamada, K, Seki, R. Eder, and Y. Ohta, Phys. Rev. B 88, 075114/1-12 (2013).

6.       Superatomic Crystal Emerging in Transition-Metal Oxides: Molybdenum Hollandite K2Mo8O16, T. Toriyama, M. Watanabe, T. Konishi, and Y. Ohta, Phys. Rev. B 88, 235116/1-8 (2013).

7.       Order, Criticality, and Excitons in the Extended Falicov-Kimball Model, S. Ejima, T. Kaneko, Y. Ohta, and H. Fehske, Phys. Rev. Lett. 112, 026401/1-5 (2014).

8.       BCS-BEC Crossover in the Two-Dimensional Attractive Hubbard Model: Variational Cluster Approach, T. Kaneko and Y. Ohta, J. Phys. Soc. Jpn. 83, 024711/1-6 (2014).

9.       Switching of Conducting Planes by Partial Dimer Formation in IrTe2, T. Toriyama, M. Kobori, T. Konishi, Y. Ohta, K. Sugimoto, J. Kim, A. Fujiwara, S. Pyon, K. Kudo, and M. Nohara, J. Phys. Soc. Jpn. 83, 033701/1-5 (2014).

10.    Important Roles of Te 5p and Ir 5d Spin-Orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir1xPtxTe2, D. Ootsuki, T. Toriyama, M. Kobayashi, S. Pyon, K. Kudo, M. Nohara, T. Sugimoto, T. Yoshida, M. Horio, A. Fujimori, M. Arita, H. Anzai, H. Namatame, M. Taniguchi, N. L. Saini, T. Konishi, Y. Ohta, and T. Mizokawa, J. Phys. Soc. Jpn. 83, xxxxxxx/1-4 (2014), in press.

11.    Excitonic Bose-Einstein Condensation above Room Temperature, K. Seki, Y. Wakisaka, T. Kaneko, T. Toriyama, T. Konishi, T. Sudayama, K. Takubo, N. L. Saini, M. Arita, H. Namatame, M. Taniguchi, N. Katayama, M. Nohara, H. Takagi, T. Mizokawa, and Y. Ohta, Nature Commun., submitted (2014).

12.    Three-dimensional Fermi surfaces of Ir0:95Pt0:05Te2, D. Ootsuki, T. Toriyama, S. Pyon, K. Kudo, M. Nohara, K. Horiba, M. Kobayashi, K. Ono, H. Kumigashira, T. Sugimoto, A. Fujimori, N. L. Saini, T. Konishi, Y. Ohta, and T. Mizokawa, Phys. Rev. Lett., submitted (2014).

13.    Charge and Orbital Orderings Associated with the Metal-Insulator Transition in V6O13, T. Toriyama, T. Nakayama, T. Konishi, and Y. Ohta, Phys. Rev. B, submitted (2014).

 

国際会議録

1.       Variational Cluster Approach to the Hubbard Model on the Honeycomb Lattice, K. Seki and Y. Ohta, J. Korean Phys. Soc. 62, 2150-2154 (2013).

2.       The Book-Keeping Fermion Analysis of the Double Exchange Model with Antiferromagnetic Background, K. Nakano, Y. Ohta, R. Eder, and P. Wróbel, J. Korean Phys. Soc. 63, 751-755 (2013).

3.       Molybdenum Hollandite K2Mo8O16 as a Superatomic Crystal, M. Watanabe, T. Toriyama, T. Konishi, and Y. Ohta, JPS Conf. Proc., in press (2014).

4.       Excitonic BCS-BEC Crossover in Double-Layer Systems, T. Kaneko, S. Ejima, H. Fehske, and Y. Ohta, JPS Conf. Proc., in press (2014).

5.       Electronic Structure of Calcium-Ferrite-Type Cr Oxide NaCr2O4, T. Toriyama, T. Konishi, and Y. Ohta, JPS Conf. Proc., in press (2014).

6.       Spectral Weights of the Square-Lattice Hubbard Model with Frustration in the Magnetic and Mott Insulator Phases, A. Yamada, K. Seki, R. Eder, and Y. Ohta, JPS Conf. Proc., in press (2014).

7.       Spin Excitations in the Square-Lattice Heisenberg Model with Ring-Exchange Interactions, K. Misumi, K. Seki, and Y. Ohta, JPS Conf. Proc., in press (2014).

8.       Variational-Cluster-Approximation Study of the Antiferromagnetic Topological Insulator States, S. Miyakoshi and Y. Ohta, JPS Conf. Proc., in press (2014).

 

2)卒業研究、大学院修士および博士論文修了指導人数

・卒業研究  3 名

・大学院修士 4 名

・大学院博士 0 名

 

3)国際会議出席と招待リスト

1.    International Conference on Strongly Correlated Electron Systems (SCES2013), Tokyo, Japan, 5-9 August 2013, Molybdenum Hollandite K2Mo8O16 as a Superatomic Crystal

 

4)教育業績

1.     統計物理学演習のテキスト「演習で学ぶ統計力学」2013年度版の作成、生協での販売

2.     Moodle2013ウェッブ上での「統計物理バーチャルセミナー」の運営

 

5)学会、国、県などへの協力,地域・社会と連携した教育・研究活動など

1.    Member of the Editorial Board of “ISRN Condensed Matter Physics” (Hindawi Publishing).  

2.    独立行政法人 新エネルギー・産業技術総合開発機構(NEDO ピアレビューア

3.    独立行政法人 日本学術振興会(JSPS 各種審査委員

 

6)特許(発明者名,発明の名称,出願日,出願番号,整理番号等)

・なし

 

7)その他 

   ・なし