Going beyond both a simple perturbative theory and Hartree-Fock treatment,the Gutzwiller variational scheme is employed to clarify the possibility of electron site-pairing in doped C_(60).It is shown that this pairing...Going beyond both a simple perturbative theory and Hartree-Fock treatment,the Gutzwiller variational scheme is employed to clarify the possibility of electron site-pairing in doped C_(60).It is shown that this pairing can be induced by electron-phonon interaction rather than electron-electron interaction.Our results are supported by EPR experiments.展开更多
It is found in this letter that the doped C_(60) possesses layer-structure in both bond distortions and electronic states.There are eight layers of carbon atoms in the charged C_(60),and its symmetry is reduced from I...It is found in this letter that the doped C_(60) possesses layer-structure in both bond distortions and electronic states.There are eight layers of carbon atoms in the charged C_(60),and its symmetry is reduced from Ih to D_(5d).This layer-structure indicates that there exist four nonequivalent groups of carbon atoms in the doped C_(60).It contrasts with the pristine C_(60),in which all the sixty carbon atoms are equivalent.One observable consequence of such layer-structure is the split of its NMR spectrum with the ratio 1:1:2:2.展开更多
基金Supported by the National Natural Science Foundation of China,and Advanced Material Committee of China.
文摘Going beyond both a simple perturbative theory and Hartree-Fock treatment,the Gutzwiller variational scheme is employed to clarify the possibility of electron site-pairing in doped C_(60).It is shown that this pairing can be induced by electron-phonon interaction rather than electron-electron interaction.Our results are supported by EPR experiments.
基金Supported by the Advanced Material Committee and the National Natural Science Foundation of China.
文摘It is found in this letter that the doped C_(60) possesses layer-structure in both bond distortions and electronic states.There are eight layers of carbon atoms in the charged C_(60),and its symmetry is reduced from Ih to D_(5d).This layer-structure indicates that there exist four nonequivalent groups of carbon atoms in the doped C_(60).It contrasts with the pristine C_(60),in which all the sixty carbon atoms are equivalent.One observable consequence of such layer-structure is the split of its NMR spectrum with the ratio 1:1:2:2.
