Strong correlations in the fermionic system with confining potential

• Project/Area Number: 20740194
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Institute of Technology (2009-2011); Kyoto University (2008)
• Principal Investigator: KOGA Akihisa 東京工業大学, 大学院・理工学研究科, 准教授 (90335373)
• Project Period (FY): 2008 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 強相関系 / 冷却原子系 / 超流動 / 平均場近似 / 量子モンテカルロ法 / 超流動状態 / 原子・分子物理 / 光格子 / 量子閉じ込め / 低温物性

Research Abstract

Strongly correlated fermionic systems with a confining potential have attracted current interest. In this study, we have investigated low temperature properties in the system by means of dynamical mean-field theory. We have considered the optical lattice system which should be described by the attractive Hubbard model and clarified the role of the confining potential in stabilizing the supersolid state.

Research Products

• [Journal Article] Low temperature properties of the fermionic mixtures with mass imbalance in optical lattice (2012)
  • Author(s): N. Takemori and A. Koga
  • Journal Title: J. Phys. Soc. Jpn. Volume: 81 Pages: 0630021-4
  • NAID: 40019308618
  • Peer Reviewed
• [Journal Article] A study on correlation effects in two dimensional topological insulators (2012)
  • Author(s): Y. Tada, R. Peters, M. Oshikawa, A. Koga, N. Kawakami, and S. Fujimoto
  • Journal Title: Phys. Rev. Volume: B85 Pages: 1651381-18
  • Peer Reviewed
• [Journal Article] Low temperature properties of the infinite-dimensional attractive Hubbard model (2011)
  • Author(s): A. Koga and P. Werner
  • Journal Title: Phys. Rev. Volume: A84 Pages: 0236381-7
  • Peer Reviewed
• [Journal Article] Superfluid state in the periodic Anderson model with attractive interactions (2011)
  • Author(s): A. Koga and P. Werner
  • Journal Title: J. Phys.: Conf. Ser. Volume: 302 Pages: 0120401-6
  • Peer Reviewed
• [Journal Article] Superfluid gap formation in a fermionic optical lattice with spin imbalanced populations (2011)
  • Author(s): A. Koga and P. Werner
  • Journal Title: J. Phys.: Conf. Ser. Volume: 273 Pages: 0121161-4
  • Peer Reviewed
• [Journal Article] Pseudogap behavior in the infinite dimensional attractive Hubbard model (2011)
  • Author(s): A. Koga and P. Werner
  • Journal Title: Mod. Phys. Lett. Volume: B25 Pages: 973-978
  • Peer Reviewed
• [Journal Article] Polarized superfluid state in a three-dimensional fermionic optical lattice (2011)
  • Author(s): A. Koga, J. Bauer, P. Werner
  • Journal Title: Th. Pruschke, Physica Volume: E43 Pages: 697-701
  • Peer Reviewed
• [Journal Article] Low temperature properties of the infinite-dimensional attractive Hubbard model (2011)
  • Author(s): A.Koga
  • Journal Title: Physical Review A Volume: 84 Issue: 2 Pages: 0236381-7
  • DOI: 10.1103/physreva.84.023638
  • Peer Reviewed
• [Journal Article] Pseudogap behavior in the infinite dimensional attractive Hubbard model (2011)
  • Author(s): A.Koga
  • Journal Title: Modern Physics Letter B Volume: 25 Issue: 12n13 Pages: 973-978
  • DOI: 10.1142/s0217984911026681
  • Peer Reviewed
• [Journal Article] Superfluid gap formation in a fermionic optical lattice with spin imbalanced populations (2011)
  • Author(s): A.Koga
  • Journal Title: Journal of Physics : Conference Series Volume: 273 Pages: 0121161-4
  • DOI: 10.1088/1742-6596/273/1/012116
  • Peer Reviewed
• [Journal Article] Superfluid state in the periodic Anderson model with attractive interactions (2011)
  • Author(s): A.Koga
  • Journal Title: Journal of Physics : Conference Series Volume: 302 Pages: 0120401-6
  • DOI: 10.1088/1742-6596/302/1/012040
  • Peer Reviewed
• [Journal Article] Polarized superfluid state in a three-dimensional fermionic optical lattice (2011)
  • Author(s): A.Koga
  • Journal Title: Physica E Volume: 43 Pages: 697-701
  • Peer Reviewed
• [Journal Article] Superfluid state in the periodic Anderson model with attractive interactions (2010)
  • Author(s): A. Koga and P. Werner, J. Phys
  • Journal Title: Soc. Jpn. Volume: 79 Pages: 1144011-7
  • Peer Reviewed
• [Journal Article] Superfluid properties of ultracold fermionic atoms in two-dimensional optical lattices (2010)
  • Author(s): Y. Fujihara, A. Koga and N. Kawakami
  • Journal Title: Phys. Rev. Volume: A81 Pages: 0636271-7
  • Peer Reviewed
• [Journal Article] Polarized Superfluidity in the Imbalanced Attractive Hubbard Model (2010)
  • Author(s): A. Koga and P. Werner, J. Phys
  • Journal Title: J. Phys. Soc. Jpn. Volume: 79 Pages: 0644011-6
  • NAID: 40017366100
  • Peer Reviewed
• [Journal Article] Analysis of superfluid state of ultracold fermions with attractive interactions in two-dimensional optical lattices (2010)
  • Author(s): Y. Fujihara, A. Koga, and N. Kawakami
  • Journal Title: Physica Volume: C470
  • Peer Reviewed
• [Journal Article] Magnetic transition in the Hubbard model on the triangular lattice (2010)
  • Author(s): T. Yoshioka, A. Koga, and N. Kawakami
  • Journal Title: Physica Volume: B405
  • Peer Reviewed
• [Journal Article] Mott transition in the Hubbard model on the triangular lattice (2010)
  • Author(s): T. Yoshioka, A. Koga, and N. Kawakami
  • Journal Title: Phys. Status Solidi Volume: B247 Pages: 635-637
  • Peer Reviewed
• [Journal Article] Magnetically Ordered State of Cold Fermions on a Decorated Square Lattice (2010)
  • Author(s): K. Noda, A. Koga, N. Kawakami and Th. Pruschke
  • Journal Title: J. Low Temp. Phys. Volume: 158 Pages: 79-84
  • Peer Reviewed
• [Journal Article] Superfluid state in the periodic Anderson model with attractive interactions (2010)
  • Author(s): A.Koga , P.Werner
  • Journal Title: J.Phys.Soc.Jpn. 79
  • Peer Reviewed
• [Journal Article] Superfluid properties of ultracold fermionic atoms in two-dimensional optical lattices (2010)
  • Author(s): Y.Fujihara, A.Koga, N.Kawakami
  • Journal Title: Phys.Rev.A 81
  • Peer Reviewed
• [Journal Article] Polarized Superfluidity in the Imbalanced Attractive Hubbard Model (2010)
  • Author(s): A.Koga , P.Werner
  • Journal Title: J.Phys.Soc.Jpn. 79
  • NAID: 40017366100
  • Peer Reviewed
• [Journal Article] Polarized Superfluidity in the Imbalanced Attractive Hubbard Model (2010)
  • Author(s): A.Koga
  • Journal Title: Journal of Physical Society of Japan Volume: 79
  • NAID: 40017366100
  • Peer Reviewed
• [Journal Article] Superfluid properties of ultracold fermionic atoms in two-dimensional optical lattices (2010)
  • Author(s): Y.Fujihara
  • Journal Title: Physical Review A Volume: 81
  • Peer Reviewed
• [Journal Article] Superfluid state in the periodic Anderson model with attractive interactions (2010)
  • Author(s): A.Koga
  • Journal Title: Journal of Physical Society of Japan Volume: 79
  • Peer Reviewed
• [Journal Article] Mott transition in the Hubbard model on the triangular lattice (2010)
  • Author(s): T.Yoshioka
  • Journal Title: Physical Status Solid B Volume: 247 Pages: 635-637
  • Peer Reviewed
• [Journal Article] Magnetic transition in the Hubbard model on the triangular lattice (2010)
  • Author(s): T.Yoshioka
  • Volume: 79
  • Peer Reviewed
• [Journal Article] Mott transition in the Hubbard model on the triangular lattice (2010)
  • Author(s): T.Yoshioka
  • Journal Title: Physical B Volume: 405
  • Peer Reviewed
• [Journal Article] Analysis of superfluid state of ultracold fermions with attractive interactions in two-dimensional optical lattices (2010)
  • Author(s): Y.Fujihara
  • Journal Title: Physica C Volume: 470
  • Peer Reviewed
• [Journal Article] Magnetically Ordered State of Cold Fermions on a Decorated Square Lattice (2010)
  • Author(s): K.Noda
  • Journal Title: Journal of Low Temperature Physics 158 Pages: 79-84
  • Peer Reviewed
• [Journal Article] Ferromagnetism of cold fermions loaded into a decorated square lattice (2009)
  • Author(s): K. Noda, A. Koga, N. Kawakami, and Th. Pruschke
  • Journal Title: Phys. Rev. Volume: A80 Pages: 0636221-7
  • Peer Reviewed
• [Journal Article] Quantum Phase Transitions in the Hubbard Model on a Triangular Lattice (2009)
  • Author(s): T. Yoshioka, A. Koga, and N. Kawakami
  • Journal Title: Phys. Rev. Lett. Volume: 103 Pages: 0364011-4
  • Peer Reviewed
• [Journal Article] Supersolid state in fermionic optical lattice systems (2009)
  • Author(s): A. Koga, T. Higashiyama, K. Inaba, S. Suga and N. Kawakami
  • Journal Title: Phys. Rev. Volume: A79 Pages: 697-701
  • Peer Reviewed
• [Journal Article] Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions (2009)
  • Author(s): Y. Fujihara, A. Koga, and N. Kawakami
  • Journal Title: Phys. Rev Volume: A79 Pages: 0136101-7
  • Peer Reviewed
• [Journal Article] Superfluidity and magnetism in two-dimensional fermionic optical lattice systems (2009)
  • Author(s): Y. Fujihara, A. Koga, and N. Kawakami
  • Journal Title: Physica Volume: B404 Pages: 3324-3327
  • Peer Reviewed
• [Journal Article] Magnetic and Orbital Properties of the two-band Hubbard Model with Different Bandwidths (2009)
  • Author(s): Y. Koyama, A. Koga, N. Kawakami, and P. Werner
  • Journal Title: Physica Volume: B404 Pages: 3267-3270
  • Peer Reviewed
• [Journal Article] Supersolid state in a fermionic optical lattice system (2009)
  • Author(s): A. Koga, T. Higashiyama, K. Inaba, S. Suga and N. Kawakami
  • Journal Title: J. Phys.: Conf. Ser. Volume: 150 Pages: 0320461-4
  • Peer Reviewed
• [Journal Article] Mott insulating state in a quarter-filled two-orbital Hubbard chain with different bandwidths (2009)
  • Author(s): S. Miyashita, Y. Yamashita, K. Yonemitsu, A. Koga, and N. Kawakami
  • Journal Title: J. Phys.: Conf. Ser. Volume: 150 Pages: 0421281-4
  • Peer Reviewed
• [Journal Article] Zero-temperature Phase Diagram of Two Dimensional Hubbard Model (2009)
  • Author(s): K. Inaba, A. Koga, S. Suga, and N. Kawakami
  • Journal Title: J. Phys.: Conf. Ser. Volume: 150 Pages: 0420661-4
  • Peer Reviewed
• [Journal Article] Ferromagnetism of cold fermions loaded into a decorated square lattice (2009)
  • Author(s): K.Noda, A.Koga, N.Kawakami, Th.Pruschke
  • Journal Title: Phys.Rev.A 80
  • Peer Reviewed
• [Journal Article] Quantum Phase Transitions in the Hubbard Model on a Triangular Lattice (2009)
  • Author(s): T.Yoshioka, A.Koga, N.Kawakami
  • Journal Title: Phys.Rev.Lett. 103
  • Peer Reviewed
• [Journal Article] Quantum Phase Transitions in the Hubbard Model on a Triangular Lattice (2009)
  • Author(s): T.Yoshioka
  • Journal Title: Physical Review Letters 103
  • Peer Reviewed
• [Journal Article] Ferromagnetism of cold fermions loaded into a decorated square lattice (2009)
  • Author(s): K.Noda
  • Journal Title: Physical Review A 80
  • Peer Reviewed
• [Journal Article] Magnetic and Orbital Properties of the two-band Hubbard Model with Different Bandwidths (2009)
  • Author(s): Y.Koyama
  • Journal Title: Physica B 404 Pages: 3267-3270
  • Peer Reviewed
• [Journal Article] Superfluidity and magnetism in two-dimensional fermionic optical lattice systems (2009)
  • Author(s): Y.Fujihara
  • Journal Title: Physica B 404 Pages: 3324-3327
  • Peer Reviewed
• [Journal Article] Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions (2009)
  • Author(s): Y. Fujihara
  • Journal Title: Physical Review A 79 Pages: 0136101-71
  • Peer Reviewed
• [Journal Article] Supersolid state in fermionic optical lattice systems (2009)
  • Author(s): A. Koga
  • Journal Title: Physical Review A 79 Pages: 0136071-6
  • Peer Reviewed
• [Journal Article] Frustration effects in an anisotropic checkerboard lattice Hubbard model (2008)
  • Author(s): T. Yoshioka, A. Koga, and N. Kawakami
  • Journal Title: Phys. Rev. Volume: B78 Pages: 1651131-6
  • Peer Reviewed
• [Journal Article] Mott Transition in the Hubbard Model on Checkerboard Lattice (2008)
  • Author(s): T. Yoshioka, A. Koga, and N. Kawakami
  • Journal Title: J. Phys. Soc. Jpn. Volume: 77 Pages: 1047021-7
  • NAID: 110006969298
  • Peer Reviewed
• [Journal Article] Supersolid state of ultracold fermions in an optical lattice (2008)
  • Author(s): A. Koga, T. Higashiyama, K. Inaba, S. Suga, and N. Kawakami
  • Journal Title: J. Phys. Soc. Jpn. Volume: 77 Pages: 736021-4
  • NAID: 110006821281
  • Peer Reviewed
• [Journal Article] Variational Monte Carlo analysis of singlet-pairing state in a system with inhomogeneous potential (2008)
  • Author(s): Y. Fujihara, A. Koga, and N. Kawakami
  • Journal Title: J. Phys. Chem. Solid Volume: 69 Pages: 3388-3391
  • Peer Reviewed
• [Journal Article] Supersolid state of ultracold fermions in an optical lattice (2008)
  • Author(s): A. Koga
  • Journal Title: Journal of Physical Society of Japan 77 Pages: 0736021-4
  • NAID: 110006821281
  • Peer Reviewed
• [Journal Article] Mott Transition in the Hubbard Model on Checkerboard Lattice (2008)
  • Author(s): T. Yoshioka
  • Journal Title: Journal of Physical Society of Japan 77 Pages: 1047021-7
  • Peer Reviewed
• [Journal Article] Frustration effects in an anisotropic checkerboard lattice Hubbard model (2008)
  • Author(s): T. Yoshioka
  • Journal Title: Physical Review B 78 Pages: 1651131-6
  • Peer Reviewed
• [Journal Article] Variational Monte Carlo analysis of singlet-pairing state in a system with inhomogeneous potential (2008)
  • Author(s): Y. Fujihara
  • Journal Title: Journal of Physics and Chemistry of Solids 69 Pages: 3388-3391
  • Peer Reviewed
• [Presentation] 相互作用のあるトポロジカル絶縁体に関する研究 (2011)
  • Author(s): 多田靖啓
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-23
• [Presentation] 二層構造を持つ光格子系におけるFFLO状態の安定性 (2011)
  • Author(s): 大川内康晴
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-22
• [Presentation] サイト依存した相互作用をもつ光格子系における金属絶縁体転移 (2011)
  • Author(s): 齋藤孝允
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-22
• [Presentation] フェルミ粒子系光格子系における擬ギャップ的振る舞い (2011)
  • Author(s): 古賀昌久
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-22
• [Presentation] 光格子フェルミ粒子系における超流動状態の安定性 (2010)
  • Author(s): 古賀昌久
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-24
• [Presentation] 光格子フェルミ粒子系における超流動状態の安定性 (2010)
  • Author(s): 古賀昌久、P.Werner
  • Organizer: 2010年秋季大会 (24aRP-1)
  • Place of Presentation: 大阪府大学
  • Year and Date: 2010-09-24
• [Presentation] フェルミ原子光格子系におけるトラップ中での超流動状態のノイズ相関 (2010)
  • Author(s): 藤原祐介、古賀昌久、川上則雄
  • Organizer: 第65回年次大会 (21pPSB-22)
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-21
• [Presentation] 光格子フェルミ粒子系における粒子数インバランスの効果 (2010)
  • Author(s): 古賀昌久
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-20
• [Presentation] 光格子フェルミ粒子系における粒子数インバランスの効果 (2010)
  • Author(s): 古賀昌久、P.Werne
  • Organizer: 第65回年次大会 (20aTB-13)
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-20
• [Presentation] 二次元フェルミ粒子光格子系における超固体状態の解析 (2009)
  • Author(s): 藤原祐介、古賀昌久、川上則雄
  • Organizer: 2009年秋季大会 (25pZE-3)
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] 軌道自由度を有するHubbard模型における磁気・軌道秩序に対する軌道間混成の影響 (2009)
  • Author(s): 小山洋太、古賀昌久、川上則雄、Philipp Werner
  • Organizer: 日本物理学会第64回年次大会(27aVL-10)
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27
• [Presentation] トラップされた光格子フェルミ粒子系における超固体状態 (2008)
  • Author(s): 古賀昌久
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22