Abstract
Electronic states in disordered conductors on the verge of localization are predicted to exhibit critical spatial characteristics indicative of the proximity to a metal-insulator phase transition. We used scanning tunneling microscopy to visualize electronic states in Ga1-xMnxAs samples close to this transition. Our measurements show that doping-induced disorder produces strong spatial variations in the local tunneling conductance across a wide range of energies. Near the Fermi energy, where spectroscopic signatures of electron-electron interaction are the most prominent, the electronic states exhibit a diverging spatial correlation length. Power-law decay of the spatial correlations is accompanied by log-normal distributions of the local density of states and multifractal spatial characteristics.
Original language | English (US) |
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Pages (from-to) | 665-669 |
Number of pages | 5 |
Journal | Science |
Volume | 327 |
Issue number | 5966 |
DOIs | |
State | Published - Feb 5 2010 |
All Science Journal Classification (ASJC) codes
- General