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We use scanning tunneling microscopy to study the temperature evolution ofelectronic structure in Ca3Cu2O4Cl2 parent Mott insulator of cuprates. We findthat the upper Hubbard band moves towards the Fermi energy with increasingtemperature, while the charge transfer band remains basically unchanged. Thisleads to a reduction of the charge transfer gap size at high temperatures, andthe rate of reduction is much faster than that of conventional semiconductors.Across the Neel temperature for antiferromagnetic order, there is no suddenchange in the electronic structure. These results shed new light on thetheoretical models about the parent Mott insulator of cuprates.

Temperature dependence of the electronic structure of Ca3Cu2O4Cl2 Mott insulator