Quantisation of hopping magnetoresistance prefactor in strongly correlated two-dimensional electron systems

✍ Scribed by Matthias Baenninger; Arindam Ghosh; Michael Pepper; Harvey E. Beere; Ian Farrer; Paula Atkinson; Dave A. Ritchie

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 491 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2007.08.099

✦ Synopsis

We report an universal behaviour of hopping transport in strongly interacting mesoscopic two-dimensional electron systems (2DES). In a certain window of background disorder, the resistivity at low perpendicular magnetic fields follows the expected relation

The prefactor r B decreases exponentially with increasing electron density but saturates to a finite value at higher densities. Strikingly, this value is found to be universal when expressed in terms of absolute resistance and and shows quantisation at R B % h=e 2 and R B % 1 2 h=e 2 . We suggest a strongly correlated electronic phase as a possible explanation.