Electrostatic confinement of electrons in an integrable graphene quantum dot
We compare the conductance of an undoped graphene sheet with a small region subject to an electrostatic gate potential for the cases that the dynamics in the gated region is regular (disc-shaped region) and classically chaotic (stadium). For the disc, we find sharp resonances that narrow upon reduci...
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| Published in | Physical review letters Vol. 102; no. 22; p. 226803 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
05.06.2009
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| Online Access | Get more information |
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| Summary: | We compare the conductance of an undoped graphene sheet with a small region subject to an electrostatic gate potential for the cases that the dynamics in the gated region is regular (disc-shaped region) and classically chaotic (stadium). For the disc, we find sharp resonances that narrow upon reducing the area fraction of the gated region. We relate this observation to the existence of confined electronic states. For the stadium, the conductance loses its dependence on the gate voltage upon reducing the area fraction of the gated region, which signals the lack of confinement of Dirac quasiparticles in a gated region with chaotic classical electron dynamics. |
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| ISSN: | 0031-9007 |
| DOI: | 10.1103/physrevlett.102.226803 |