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Effects of correlation on the conductivity of a two-dimensional weakly disordered lattice with particle-hole symmetric energy bands: Metal-insulator transition at half filling

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Nakhmedov,  E. P.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Prigodin,  V.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Nakhmedov, E. P., Prigodin, V., Çaliskan, S., & Şaşioğlu, E. (2002). Effects of correlation on the conductivity of a two-dimensional weakly disordered lattice with particle-hole symmetric energy bands: Metal-insulator transition at half filling. Physical Review B, 66(23): 233105. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000066000023233105000001&idtype=cvips&gifs=yes.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-367A-1
Abstract
The conductivity sigma(T) of a two-dimensional weakly disordered square lattice is studied at half-filling in the presence of the electron-electron correlations. The particle- hole symmetry, existing in the energy spectrum at half-filling, results in quantum corrections to sigma(T). The negative interaction contribution to sigma(T) in the weak localization regime, taking place far from half-filling, changes the sign due to the Bragg reflection assisted quantum corrections, and sigma(T) logarithmically increases with decreasing the temperature as half-filling is approached.