Book

“New many-body theories for soft x-ray spectroscopy of insulating solids”
                 N. Tomita and K. Nasu, World Scientific, Singapore, 2002, ( ISBN 981-02-4682-X ).

Original Articles

1.       Anomalies in spin of SDW solitons and in charge of CDW solitons in the 1d extended Hubbard model with a bond alternation,
N. Tomita and H. Fukutome, Solid State Commun. 81(1992)659-662.

2.       Regular density waves in the half-filled 1d extended Hubbard model with a bond alternation,
  N. Tomita and H. Fukutome, Solid State Commun. 81(1992)663-666.

3.       Halfon excitation connecting SDW and CDW,
N. Tomita and H. Fukutome, Synth. Met. 55-57(1993) 2761-2766.

4.       Elementary defects, halfons, connecting the SDW and CDW in the one dimensional extended Hubbard model 
N. Tomita and H. Fukutome, J. Phys. Soc. Jpn. 62(1993)1634-1652.

5.       Resonating Hartree-Fock studies on electron correlation and bond alternation in the one dimensional half filled Hubbard model,
N. Tomita, A. Ikawa and H. Fukutome, J. Phys. Soc. Jpn. 62(1993) 4338-4351.

6.       Resonating Hartree-Fock studies on electronic structures of excited states in the one dimensional bond alternated Hubbard model,
N. Tomita, A. Ikawa and H. Fukutome, J. Phys. Soc. Jpn. 63(1994)191-208.

7.       The SDW-CDW phase transition and quantum fluctuations in the one dimensional extended Hubbard model,
      N. Tomita, A. Ikawa and H. Fukutome, Synth. Met. 69(1995)679-680.
 

8.       The SDW-CDW phase transition in the one dimensional extended Hubbard model,
     N. Tomita, A. Ikawa and H. Fukutome, J. Phys. Soc. Jpn. 65(1996)195-206.

9.       Ab initio molecular orbital calculations by the resonating Hartree-Fock approach : Superposition of non-orthogonal Slater determinants,
N. Tomita, S. Tenno, and Y. Tanimura, Chem. Phys. Lett. 263(1996) 687-690.

10.   Path-integral theory for light absorption spectra of many-electron systems in insulating states due to strong long-range Coulomb repulsion : Nonlinear coupling between charge and spin excitations,
N. Tomita and K. Nasu, Phys. Rev. B56(1997)3779-3786.

11.   Difference between the small one-electron gap and the large optical gap in one-, two-, and three-dimensional half-filled Hubbard models,
N. Tomita and K. Nasu, Solid State Commun. 111(1999)175-179.

12.   Predominance of the multimagnon incoherent component and minuteness of the zero-magnon coherent component in one-body Green’s functions of half-filled Hubbard models,
N. Tomita and K. Nasu, Phys. Rev. B60(1999)8602-8609.

13.   Nonlinear excitations in charge- and spin-density-wave materials - Excitons, solitons and (bi) polarons,
      K. Iwano, S. Hasanuzzaman, N. Tomita and K. Nasu, Synth. Met. 103 (1999)2620-2623.
 

14.   Difference between the one-electron small gap and the wide optical gap in 1-, 2-, and 3-dimensional insulating states coming from the strong Coulomb repulsion, N. Tomita and K. Nasu, J. Electron Spectrosc. Relat. Phenom. 101-103 (1999)729-732.

15.   Fluctuation effects of nonlinear coupling between spin and charge excitations on dynamical correlation functions of the one-dimensional extended Hubbard model, N. Tomita and K. Nasu, Phys. Rev. B61(2000) 2488-2496.

16.   Minute zero-magnon component and predominant multi-magnon one in photoemission spectrum of the two-dimensional half-filled Hubbard system,
N. Tomita and K. Nasu, Physica B281&282(2000)842-844.

17.   One-body green function of half-filled Hubbard model predominated by multi-magnon incoherent component,
N. Tomita and K. Nasu, J. Phys. Chem. Solids 62(2001)293-296.

18.   Quantum fluctuation effects on light absorption spectra of the one-dimensional extended Hubbard model,  
N. Tomita and K. Nasu, Phys. Rev. B63(2001)085107-1-7.

19.   Unified theory for photoemission and light absorption spectra of a one-dimensional interacting electron system,
N. Tomita and K. Nasu, Phys. Rev. B64(2001)125118-1-5.

20.   One-body Green functions of half-filled Hubbard models; Predominance of multi-magnon incoherent component and minuteness of zero-magnon coherent one,
      N. Tomita and K. Nasu, J. Electron Spectrosc. Relat. Phenom. 114-116 (2001)759-763.


21.  
Unified theory on the angle-resolved photoemission and light absorption spectra of strongly correlated electron systems,
      N. Tomita and K. Nasu, J. Phys. Chem. Solids 63(2002)1583-1586. 

22.   Exciton effects on the light absorption and photoemission spectra of the one-dimensional Mott insulator [Ni(chxn)2Br]Br2(chxn=1r, 2r-cyclo-hexanediamine),
N. Tomita and K. Nasu, Journal of Nonlinear Optics 29(2002)247-255.
 

23.   Non-grassmann path integral theory for momentum specified photoemission and light absorption spectra of many-electron system with strong long range Coulomb repulsion, K. Nasu and N. Tomita, J. Electron Spectrosc. Relat. Phenom. 124(2002) 317-333.

24.   Unified theory on angle-resolved photoemission and light absorption spectra of strongly correlated electron systems,
N. Tomita and K. Nasu, Surface Review and Letters 9(2002)1017-1021.

25.   Intermediately Correlated Many-electron Systems Studied by Quantum Monte Carlo Method,
      M. Yamazaki, N. Tomita and K. Nasu, J. Phys. Soc. Jpn.72(2003)611-617.

 26.   Path-integral theory on the metal-insulator transition in the three- dimensional Hubbard model,
       N. Tomita, M. Yamazaki and K. Nasu, Phys. Rev. B68(2003)035117-1-5.

 27.   Metal-insulator transition in the three-dimensional Hubbard model,
N. Tomita, M. Yamazaki, and K. Nasu,
J. Electron Spectrosc. Relat. Phenom. 137-140(2004)613-617.

28.   New aspects of Mott transition in intermediately correlated one-dimensional Hubbard systems,
      M. Yamazaki, N. Tomita, and K. Nasu, J. Electron Spectrosc. Relat. Phenom. 137-140 (2004) 647-650.

29. Many-body wave functions approximated by the superposition of spin-projected nonorthogonal Slater determinants in the resonating Hartree-Fock method,
N. Tomita, Phys. Rev. B69(2004)045110-1-10.

30.  Coexistence of both coherent and incoherent peaks in photoemission spectra of intermediately correlated many-electron systems,
K. Nasu, M. Yamazaki, N. Tomita, H. Zhao and C. Wu, J. Electron Spectrosc. Relat. Phenom. 136(2004)49-56
.

 

31.   High energy angle resolved photoemission spectroscopy probing bulk correlated electronic states in quasi-one-dimensional V6O13 and SrCuO2,
     S.Suga, A.Shigemoto, A.Sekiyama, S.Imada, A.Yamasaki, A.Irizawa, S.Kasai, Y.Saitoh, T.Muro, N.Tomita, K.Nasu, H.Eisaki and Y.Ueda, Phys. Rev. B70(2004).155106-1-7.
 
32.   Theoretical aspects of photoemission spectroscopy on strongly correlated electron systems,  
  N. Tomita, M. Yamazaki, and K. Nasu, J. Electron Spectrosc. Relat. Phenom. 144-147(2005) 1237-1240.

33. Quantum coherence and decoherence of the correlated electron states in the one-dimensional CDW-SDW phase transition,
N. Tomita, Phys.
Rev. B73(2006)115105.

34. Electron correlation effects on Lehmann spectra of one-body Green functions for insulating states caused by the Coulomb repulsion,
N. Tomita
and K. Nasu,
Phys. Rev. B75(2007) 115132
-1-8

35. Antiferromagnetic fluctuations in the quantum phase transition of the one-dimensional electron system,
N. Tomita, J. Appl. Phys.
101 (2007) 09G509.

36. Visualization of quantum fluctuations by superposition of optimized nonorthogonal Slater determinants,
N. Tomita
, Phys. Rev. B79(2009)075113.

37. Quantum fluctuations in the one dimensional doped Hubbard model,
N Tomita
, J. Phys. Conference Series 150(2009)042214.

38. Quantum fluctuations due to spinons, polarons, and stripes in the two-dimensional Hubbard model,
N. Tomita and S. Watanabe, Phys. Rev. Lett. 103(2009)116401.

39. Visualization of electronic structures in the two-dimensional Hubbard model -spinon, polaron and stripes- ,
N. Tomita and S. Watanabe, J. Appl. Phys. 107(2010)09E127.

40. Resonating Hartree-Fock Studies on magnetic states in the Hubbard model on the uniform triangular lattice ,
T. Maruyama, F. Sato and N. Tomita, Journal of Physics, Conference Series 320(2011) 012061.

41. Group-theoretical and resonating Hartree-Fock studies for spin fluctuations in two-dimensional Hubbard model on triangular lattice ,
F. Sato, T. Maruyama, M. Ozaki and N. Tomita, Phys. Rev. B84(2011) 245101.

42. Visualization of quantum electronic and lattice fluctuations in the Hubbard model by using a resonating Hartree-Fock method ,
N. Tomita, S. Watanabe, K, Shida, H. Gomi, and A. Takahashi, Journal of Physics, Conference Series 410(2013) 012159.

43. Resonating Hartree-Fock studies on the electronic structures of the two-dimensional hole-doped Hubbard model ,
S. Watanabe, M. Kato and N. Tomita, J. Phys. Soc. Jpn. 82(2013) 044705.

44. Time-Dependent Configuration Interaction Approach for Multielectron System Confined in Two-Dimensional Quantum Dot ,
T. Okunishi, R. Clark, K. Takeda, K. Kusakabe, and N. Tomita, Jpn. J. App. Phys. 52(2013)022801.

Review  in Japanese

1.       強相関絶縁体の一電子状態密度におけるインコヒーレント成分の優勢、富田憲一、那須奎一 郎,
物性研究72(1999)513-515、基研研究会報告、強結合超伝導、pseudo-gapを中心として

 
2.
強相関絶縁系の光電子スペ クトルの理論−そのピークはバンド状態を反映しているのか−、

富田憲一、那須奎一郎、 固体物理(アグネ技術センタ−)35(2000)176-184.

 
3.
共鳴Hartree-Fock法を用いた量子揺らぎの視覚化 、

富田憲一 日本物理学会学会誌2011年6月号430.