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Combination of the finite-temperature density-matrix renormalization-groupand the maximum entropy presents a new method to calculate dynamic quantitiesof one-dimensional many-body systems. In the present paper, density of states,local dynamic spin and charge correlation functions of the one-dimensionalKondo insulator are discussed. Excitation gaps open with decreasing temperatureand the gaps take different values depending on channels. The excitationspectra change qualitatively around the characteristic temperaturecorresponding to the spin gap which is the lowest energy scale of the Kondoinsulator.Comment: 6 pages, 3 Postscript figures, REVTeX, submitted to Phys. Rev. Let

physical review letters

Temperature-Induced Gap Formation in Dynamic Correlation Functions of the One-Dimensional Kondo Insulator: Finite-Temperature Density-Matrix Renormalization-Group Study