Previous works
1. "New variational approach to the periodic Anderson model"
T. Yanagisawa, Physical Review B37, 2050 (1988).
この論文と次の論文ではheavy fermion系のモデルである周期的アンダーソンモデルにおいて、Gutzwiller波動関数に対して摂動展開の計算を行いました。Gutzwiller近似では簡単に強磁性にオーダーしてしまうことへの疑問から計算を始めましが、摂動的に磁性を議論するのはやはり難しいというところです。
2. "Variational theory for the orbital-degenerate periodic Anderson model"
T. Yanagisawa, Physical Review B38, 9099 (1988).
上の方法を軌道縮退のある場合に拡張しました。
3. "On Metal-Insulator Transitions due to Self-Doping"
S. Blawid, H. A. Tuan, T. Yanagisawa and P. Fulde, Physical Review B54, 7771 (1996).
二バンドの伝導系では、下のバンドに電子がつまって絶縁体になるべき場合であっても、上のバンドに電子が励起してself-dopingにより金属的に成りうる、というシナリオを考えた論文です。
4. "Evaluation of the matrix elements with graded-Lie-algebraic operators"
T. Yanagisawa, Physical Review B40, 6666 (1989).
強相関の効果を含んだHubbardの演算子は交換子が再び演算子と成ります。すなわち、相関効果によりフェルミンの交換子ではなく非可換演算子となります。このような演算子に対する摂動展開の方法を考えてみました。すなわち、Wickの定理の拡張ということです。
5. "Ground State and Staggered Susceptibility of the Two-Impurity Problem"
T. Yanagisawa, J. Phys. Soc. Japan 60 (1991) 2823.
近藤問題を拡張した、磁性不純物が二つ存在する近藤問題を厳密対角化により調べました。対角化の結果は一不純物に対する一重項波動関数（芳田奎氏による）を拡張したものでうまく説明できます。数値くりこみ群により、不純物間の相互作用の強さを変えていくと、スタガード帯磁率が発散する特異点があると言われていましたが、モデルを簡単化したために生じたみかけのものであることがわかりました。
6. "Diagonalization Study of the Two-Impurity Anderson Model"
T. Yanagisawa, J. Phys. Soc. Japan 60 (1991) 3449.
7. "Crossover and order-disorder transition in the two-dimensional antiferromagnet
at low temperatures"
T. Yanagisawa, Physical Review Letters 68, 1026 (1992).
非線型シグマモデルにフェルミオンを導入したモデルを考えて、反強磁性の秩序ー無秩序転移を１ループのベータ関数により議論しました。
8. "Renormalization of the quantum antiferromagnet in two dimensions"
T. Yanagisawa, Physical Review B46, 13896 (1992).
9. "Itinerant ferromagnetism in strongly correlated electron systems"
T. Yanagisawa and Y. Shimoi: Physical Review B48, 6104 (1993).
10. "Superconductivity indications of the two-chain Hubbard model due to the two-band effect"
K. Yamaji, Y. Shimoi and T. Yanagisawa, Physica C235-240, 2221 (1994).
11. "Ferromagnetic transition of the Kondo lattice with Coulomb repulsion: Exact results"
T. Yanagisawa and K. Harigaya, Physical Review B50, 9577 (1994).
12. "Ground state of the Kondo-Hubbard model at half filling"
T. Yanagisawa and Y. Shimoi, Physical Review Letters 74, 4939 (1995);
ibid 76, 556 (E) (1996).
13. "Superconducting phase of a two-chain Hubbard model"
T. Yanagisawa, Y. Shimoi and K. Yamaji, Physical Review B52, 3860 (1995).
14. "Exact results in strongly correlated electrons"
T. Yanagisawa and Y. Shimoi, Int. Journal of Modern Physics B10, 3383-3450 (1996).
15. "Variational Monte Carlo Indications of d-Wave Superconductivity in the Two-Dimensional Hubbard Model"
T. Nakanishi, K. Yamaji and T. Yanagisawa, J. Phys. Soc. Japan 66 (1997) 294.
16. "Variational Monte Carlo Study on the Superconductivity in the Two-Dimensional Hubbard Model"
K. Yamaji, T. Yanagisawa, T. Nakanishi and S. Koike: Physica C304 (1998) 225-239.
17. "Off-diagonal wave function Monte Carlo studies of Hubbard model I"
T. Yanagisawa, S. Koike and K. Yamaji: J. Phys. Soc. Jpn. 67 (1998) 3867-3874.
18. "Effect of the Medium-Range Transfer Energies to the Superconductivity in the Two-Chain Hubbard Model"
S. Koike, K. Yamaji and T. Yanagisawa: J. Phys. Soc. Jpn. 68 (1999) 1657.
19. "Fermi surface properties and de Haas-van Alphen oscillation in both the normal and superconducting mixed states of URu$_2$Si$_2$"
H. Ohkuni, Y. Inada, Y. Tokiwa, K. Sakurai, R. Settai, T. Honma, Y. Haga,
E. Yamamoto, Y. Onuki, H. Yamagami, S. Takahashi and T. Yanagisawa:
Philosophical Magazine B79, 1045-1077 (1999).
20. "Fermi Surface and de Haas-van Alphen Oscillation in both the Normal and Superconducting Mixed States of UPd$_2$Al$_3$"
Y. Inada, H. Yamagami, Y. haga, K. Sakurai. Y. Tokiwa, T. Honma, E.
Yamamoto, Y. Onuki and T. Yanagisawa: J. Phys. Soc. Jpn. 68 (1999) 3643-3654.
21. "Superconducting Condensation Energy of the Two-Chain Hubbard Model in the Bulk Limit"
S. Koike, K. Yamaji and T. Yanagisawa: J. Phys. Soc. Jpn. 69 (2000) 2199-2208.
22. "Superconducting and SDW condensation energies in the 2D Hubbard model and the meaning to the stripe phase"
K. Yamaji, T. Yanagisawa, S. Koike: J. Phys. Chem. Solids 62, 237-241 (2001).
23. "Anisotropic Optical Conductivity of Nd$_{2-x}$Ce$_x$CuO$_4$ Thin Films"
T. Yanagisawa, S. Koikegami, H. Shibata, S. Kimura, S. Kashiwaya, A. Sawa,
N. Matsubara and K. Takita: J. Phys. Soc. Jpn. 70 (2001) 2833.
24. "Ground state of the Three-band Hubbard model"
T. Yanagisawa, S. Koike, and K. Yamaji: Phys. Rev. B64, 184509 (2001).
25. "Stripe formation in high-T$_c$ superconductors"
T. Yanagisawa, S. Koike, M. Miyazaki and K. Yamaji: J. Phys. Condensed Matter 14, 21 (2002).
26. "Quantum Interference Oscillation in DHvA Effect in Two- and Three- dimensional systems"
K. Kishigi, Y. Hasegawa and T. Yanagisawa: J. Phys. Soc. Jpn. 71, Suppl. 214-216 (2002).
27. "Possible coexistence of superconductivity and static SDW stripes in the
two- dimensional Hubbard model"
M. Miyazaki, K. Yamaji and T. Yanagisawa: J. Phys. Chem. Solids 63, 1403 (2002).
28. "Lattice distortions, incommensurability, and stripes in the electronic model for high-T$_c$ cuprates"
T. Yanagisawa, S. Koikegami, M. Miyazaki, S. Koike, and K. Yamaji: Phys. Rev. B67, 132408 (2003).
29. "Superconductivity in Sr$_2$RuO$_4$ mediated by Coulomb scatterings"
S. Koikegami, Y. Yoshida, and T. Yanagisawa: Phys. Rev. B67, 134517 (2003).
30. "Dynamical Stripe Correlation in the d-p Model at 1/8-filling"
S. Koikegami, T. Yanagisawa, M. Kato: Physica B329-333, 781 (2003).
31. "Lattice distortions and stripes in the underdoped region of high-$T_c$
cuprates"
T. Yanagisawa: Journal of Physics A36 (2003) 9337-9349.
Invited Talk at the Conference Strongly Correlated Electrons in New Materials
(Loughborough, England, 2002).
32. "Orbital-dependent two-band superconductivity in MgB$_2$"
T. Yanagisawa and H. Shibata: J. Phys. Soc. Japan 72 (2003) 1619.
33. "Striped metal in two-dimensional d-p model"
S. Koikegami, T. Yanagisawa and M. Kato: Physica C392 (2003) 213-215.
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