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Muta, Hiroaki*; Nishikane, Ryoji*; Ando, Yusuke*; Matsunaga, Junji*; Sakamoto, Kan*; Harjo, S.; Kawasaki, Takuro; Oishi, Yuji*; Kurosaki, Ken*; Yamanaka, Shinsuke*
Journal of Nuclear Materials, 500, p.145 - 152, 2018/03
Times Cited Count:11 Percentile:77.59(Materials Science, Multidisciplinary)Nakamura, Yusuke*; Mine, Makoto*; Okumura, Masahiko; Yamanaka, Yoshiya*
Soryushiron Kenkyu, 116(2), p.B67 - B69, 2008/06
no abstracts in English
Nakamura, Yusuke*; Mine, Makoto*; Okumura, Masahiko; Yamanaka, Yoshiya*
Physical Review A, 77(4), p.043601_1 - 043601_6, 2008/04
Times Cited Count:18 Percentile:64.33(Optics)The condition for the appearance of dynamical instability of the Bose- condensed system, characterized by the emergence of complex eigenvalues in the Bogoliubov-de Gennes equations, is studied analytically. It is concluded that the degeneracy between a positive- norm eigenmode and a negative-norm one is essential for the emergence of complex modes. Based on the conclusion, we justify the two-mode approximation applied in our previous work, in which we analytically studied the condition for the existence of complex modes when the condensate has a highly quantized vortex.
Nakamura, Yusuke*; Mine, Makoto*; Okumura, Masahiko; Yamanaka, Yoshiya*
no journal, ,
no abstracts in English
Yamaguchi, Kenji; Matsumura, Seidai*; Yamanaka, Yusuke*; Hojo, Kiichi; Udono, Haruhiko*
no journal, ,
no abstracts in English
Matsumura, Seidai*; Yamanaka, Yusuke*; Udono, Haruhiko*; Yamaguchi, Kenji; Esaka, Fumitaka; Hojo, Kiichi
no journal, ,
no abstracts in English