Department of Physics
Condensed Matter Seminar

The area of strongly correlated electrons continues attracting the attention of the condensed matter community. Besides its well-known relevance for the description of some bulk materials, such as transition metal oxides, strong correlation is important to address issues of transport related with Kondo effects in quantum dots and small molecules, and it is also important to study properties of oxide superlattices. In this presentation, recent theoretical results in this context will be summarized. This includes (a) Monte Carlo studies of double-exchange manganite models that show the colossal magnetoresistance effect [1], (b) investigations of manganite and manganite/cuprate superlattices using a variety of techniques [2], and (c) a study of transport in quasi one-dimensional systems using the time-dependent density matrix renormalization group technique [3]. Future work will also be discussed. This work is supported by NSF and DOE, and it represents a collaboration with K. Al-Hassanieh, G. Alvarez, C. Busser, A. Feiguin, A. Fujimori, I. Gonzalez, F. Heidrich-Meisner, S. Kancharla, G. Martins, R. Melko, A. Moreo, S. Okamoto, F. Popescu, J. Riera, C. Sen, I. Sergienko, and S. Yunoki [1] C. Sen et al., Phys. Rev. Lett. 98, 127202 (2007). E. Dagotto,Science 309, 257 (2005). [2] S. Yunoki et al., cond-mat/07050498, PRB to appear; S. Yunoki et al., in preparation. [3] K. A. Al-Hassaniehet al., Phys. Rev. B 73, 195304 (2006),and work in progress.