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Rattling-Induced Heavy Fermion State in the Anharmonic Holstein Model
Rattling-Induced Heavy Fermion State in the Anharmonic Holstein Model
Fuse, Takahiro
Ono, Yoshiaki
Copyright (C) 2011 The Physical Society of Japan
polarons
bipolarons
bipolaronic transition
Holstein model
rattling
anharmonic potential
heavy fermion
We investigate the heavy fermion states in the half-filled anharmonic Holstein model by using the dynamical mean-field theory combined with the exact diagonalization method at low temperatures down to 1/10^4 of the conduction bandwidth. For the weak anharmonic cases with single-well or shallow double-well potentials, the bipolaronic first order phase transition takes place at a critical value of the electron-phonon coupling below a critical temperature as recently observed in the harmonic Holstein model. On the other hand, for the strong anharmonic case with deep double-well potential, the bipolaronic transition is suppressed and changes to a crossover where the heavy fermion state with a large effective mass is realized due to the effect of largely anharmonic local oscillations called rattling.
Proceedings of the International Conference on Heavy Electrons 2010 (ICHE2010)
日本物理学会
2011-07
eng
journal article
http://hdl.handle.net/10191/26830
https://niigata-u.repo.nii.ac.jp/records/2119
info:doi/10.1143/JPSJS.80SA.SA136
http://journals.jps.jp/doi/abs/10.1143/JPSJS.80SA.SA136
AA00704814
00319015
Journal of the Physical Society of Japan
Journal of the Physical Society of Japan
80
Supplement A
SA136-1
SA136-3
https://niigata-u.repo.nii.ac.jp/record/2119/files/978.pdf
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2019-07-29