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You are here: Home News Picture of the Quarter 2nd Quarter 2013 - Emergent randomness from strong electronic interactions

2nd Quarter 2013 - Emergent randomness from strong electronic interactions

In a number of complex materials strong electron interactions induce a metal-to-insulator transition, the so-called Mott-Hubbard transition. Near this 1st-order transition, insulating nanodomains coexist with metallic regions, just like ice cubes can exist in a glass of water.

That is, randomness is spontaneously generated in the originally homogeneous material, with profound consequences on the electric conductivity and other physical quantities.

The picture shows the first calculation of random nanodomains in a Mott-Hubbard insulator, using site-dependent Dynamical Mean Field Theory (DMFT). The axes denote the spatial extension of the sample in units of the lattice spacing. Insulating domains are visible as spherical structures. The color code represents the computed voltage drop at the nanodomain boundaries in a sample with finite voltage bias applied perpendicular to the picture plane. [Q. Liu and J. Kroha, 2013] 

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