Goswami, Srijit and Aamir, Mohammed Ali and Shamim, Saquib and Siegert, Christoph and Pepper, Michael and Farrer, Ian and Ritchie, DavidA and Ghosh, Arindam (2013) Electrostatic modulation of periodic potentials in a two-dimensional electron gas: from antidot lattice to quantum dot lattice. In: 31st International Conference on the Physics of Semiconductors (ICPS), JUL 29-AUG 03, 2012, Zurich, SWITZERLAND, pp. 257-258.
Full text not available from this repository. (Request a copy)Abstract
We use a dual gated device structure to introduce a gate-tuneable periodic potential in a GaAs/AlGaAs two dimensional electron gas (2DEG). Using only a suitable choice of gate voltages we can controllably alter the potential landscape of the bare 2DEG, inducing either a periodic array of antidots or quantum dots. Antidots are artificial scattering centers, and therefore allow for a study of electron dynamics. In particular, we show that the thermovoltage of an antidot lattice is particularly sensitive to the relative positions of the Fermi level and the antidot potential. A quantum dot lattice, on the other hand, provides the opportunity to study correlated electron physics. We find that its current-voltage characteristics display a voltage threshold, as well as a power law scaling, indicative of collective Coulomb blockade in a disordered background.
| Item Type: | Conference Proceedings |
|---|---|
| Series.: | AIP Conference Proceedings |
| Publisher: | AMER INST PHYSICS |
| Additional Information: | Copyright for this article belongs to the AMER INST PHYSICS, USA |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 15 May 2014 05:51 |
| Last Modified: | 11 Feb 2019 05:18 |
| URI: | http://eprints.iisc.ac.in/id/eprint/48894 |
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