Superconductivity without Inversion Symmetry: MnSi versus PA Frigeri, DF Agterberg, A Koga, M Sigrist Physical review letters 92 (9), 097001, 2004 | 638 | 2004 |

Orbital-selective Mott transitions in the degenerate Hubbard model A Koga, N Kawakami, TM Rice, M Sigrist Physical review letters 92 (21), 216402, 2004 | 317 | 2004 |

Quantum Phase Transitions in the Shastry-Sutherland Model for A Koga, N Kawakami Physical review letters 84 (19), 4461, 2000 | 176 | 2000 |

Quantum phase transitions in the Hubbard model on a triangular lattice T Yoshioka, A Koga, N Kawakami Physical review letters 103 (3), 036401, 2009 | 112 | 2009 |

Spin, charge, and orbital fluctuations in a multiorbital Mott insulator A Koga, N Kawakami, TM Rice, M Sigrist Physical Review B 72 (4), 045128, 2005 | 97 | 2005 |

Stability of a metallic state in the two-orbital Hubbard model A Koga, Y Imai, N Kawakami Physical Review B 66 (16), 165107, 2002 | 82 | 2002 |

First-order quantum phase transition in the orthogonal-dimer spin chain A Koga, K Okunishi, N Kawakami Physical Review B 62 (9), 5558, 2000 | 67 | 2000 |

Finite-temperature Mott transitions in the multiorbital Hubbard model K Inaba, A Koga, S Suga, N Kawakami Physical Review B 72 (8), 085112, 2005 | 62 | 2005 |

Superconductivity in non-centrosymmetric materials M Sigrist, DF Agterberg, PA Frigeri, N Hayashi, RP Kaur, A Koga, I Milat, ... Journal of Magnetism and Magnetic Materials 310 (2), 536-540, 2007 | 61 | 2007 |

Frustrated Heisenberg antiferromagnet on the pyrochlore lattice A Koga, N Kawakami Physical Review B 63 (14), 144432, 2001 | 59 | 2001 |

Correlation effects in two-dimensional topological insulators Y Tada, R Peters, M Oshikawa, A Koga, N Kawakami, S Fujimoto Physical Review B 85 (16), 165138, 2012 | 49 | 2012 |

Phase diagrams of the two-orbital Hubbard model with different bandwidths K Inaba, A Koga Physical Review B 73 (15), 155106, 2006 | 48 | 2006 |

Low-temperature properties of the infinite-dimensional attractive Hubbard model A Koga, P Werner Physical Review A 84 (2), 023638, 2011 | 43 | 2011 |

Field-induced phase transitions in a Kondo insulator T Ohashi, A Koga, S Suga, N Kawakami Physical Review B 70 (24), 245104, 2004 | 42 | 2004 |

Supersolid state of ultracold fermions in optical lattice A Koga, T Higashiyama, K Inaba, S Suga, N Kawakami Journal of the Physical Society of Japan 77 (7), 073602-073602, 2008 | 40 | 2008 |

J. of Phys.: Cond. Mat. J. of Phys.: Cond. Mat. 16, 7063, 2004 A Koga, K Inaba, N Kawakami Progress of theoretical physics. Supplement 160, 253-273, 2006 | 40 | 2006 |

Competing spin-gap phases in a frustrated quantum spin system in two dimensions Y Takushima, A Koga, N Kawakami Journal of the Physical Society of Japan 70 (5), 1369-1374, 2001 | 40 | 2001 |

SrCu2 (BO3) 2: A unique Mott Hubbard insulator B Sriram Shastry, B Kumar Progress of Theoretical Physics Supplement 145, 1-16, 2002 | 39 | 2002 |

Supersolid state in fermionic optical lattice systems A Koga, T Higashiyama, K Inaba, S Suga, N Kawakami Physical Review A 79 (1), 013607, 2009 | 37 | 2009 |

Quantum phase transitions for the Haldane system in higher dimensions: A mixed-spin cluster expansion approach A Koga, N Kawakami Physical Review B 61 (9), 6133, 2000 | 36 | 2000 |