1.1 量子ＸＸＺ鎖におけるsl₂ ループ代数の対称性と準位交差
The sl₂ loop algebra symmetry of the XXZ spin chain and level crossings (6POP)

原著論文　 Original papers

1. T. Deguchi, K. Fabricius and B.M. McCoy,
   The sl₂ loop algebra symmetry of the six-vertex model at roots of unity,
   J. Stat. Phys. 102 (2001) 701-736. (cond-mat/9912141)

2. T. Deguchi,
   Non-regular eigenstate of the XXX model as some limit of the Bethe state,
   J. Phys. A: Math. Gen. 34 (2001) 9755-9775. (cond-mat/0107260)

3. T. Deguchi,
   Construction of some missing eigenvectors of the XYZ spin chain at the discrete coupling constants and the exponentially large spectral degeneracy of the transfer matrix,
   J. Phys. A: Math. Gen.35 (2002) 879-895. (cond-mat/0109078)

4. T. Deguchi,
   The 8V CSOS model and the sl₂ loop algebra symmetry of the six-vertex model at roots of unity, Int. J. Mod. Phys. B 16 (2002) 1899-1905. (cond-mat/0110121)

5. K. Kudo and T. Deguchi,
   Branches in the spectral flow of the inhomogeneous transfer matrix for the XXZ spin chian,
   to appear in J. Phys. Soc. Jpn. 72 No. 7 (2003)

6. T. Deguchi,
   XXZ Bethe states as highest weight vectors of the sl₂ loop algebra at roots of unity, cond-mat/0212217 (revised 23 March 2003)

7. T. Deguchi,
   The sl₂ loop algebra symmetry of the twisted transfer matrix of the six-vertex model at roots of unity, submitted to J. Phys. A for the proceedings of RAQIS03, Annecy, France, March 2003. (cond-mat/0306498)

8. K. Kudo and T. Deguchi,
   Unexpected non-Wigner behavior in level spacing distributions of next-nearest-neighbor coupled XXZ spin chains, to appear in Phys. Rev. B (2003).

国内研究会の報告　 Reports of workshops in Japan

1. 出口哲生、工藤和恵、「可積分量子スピン系における異常な準位交差」 （基研研究会「量子カオス：理論と実験の現状」０２年９月９日−１１日） 物性研究　Vol. 80 No.1 (2003/4) pp. 195-199.