Optical Properties of Dirac Electrons in a Parabolic Well
- Authors
- Kim, S. C.; Lee, J. W.; Yang, S. -R. Eric
- Issue Date
- 9월-2013
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Graphene; Dirac Electron; Parabolic Well
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.13, no.9, pp.6345 - 6348
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 13
- Number
- 9
- Start Page
- 6345
- End Page
- 6348
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/102342
- DOI
- 10.1166/jnn.2013.7709
- ISSN
- 1533-4880
- Abstract
- A single electron transitor may be fabricated using qunatum dots. A good model for the confinement potential of a quantum dot is a parabolic well. Here we consider such a parabolic dot made of graphene. Recently, we found counter intuitively that resonant quasi-boundstates of both positive and negative energies exist in the energy spectrum. The presence of resonant quasi-boundstates of negative energies is a unique property of massless Dirac fernnions. As magnetic field B gets smaller the energy width of these states become broader and for sufficiently weak value of B resonant quasi-bound states disappear into a quasi-continuum. In the limit of small B resonant and non-resonant states transform into discrete anomalous states with a narrow probability density peak inside the well and another broad peak under the potential barrier. In this paper we compute the optical strength between resonant quasi-bound states as a function of B, and investigate how the signature of resonant quasi-bound states of Dirac electrons may appear in optical measurements.
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