Collective Charge Excitation in a Dimer Mott Insulating System
Collective Charge Excitation in a Dimer Mott Insulating System
Charge dynamics in a dimer Mott insulating system, where a non-polar dimer-Mott (DM) phase and a polar charge-ordered (CO) phase compete with each other, are studied. In particular, collective charge excitations are analyzed in the three different models where the internal-degree of freedom in a dimer is taken into account. …