“School of Nano-Sciences”
Back to Papers HomeBack to Papers of School of Nano-Sciences
| Paper IPM / Nano-Sciences / 17480 |
|
||||
| Abstract: | |||||
|
We study cloaking of a cluster of electrostatically defined coreâ??shell quantum dots in graphene. Guided by the generalized multiparticle Mie theory, the Dirac electron scattering from a cluster of quantum dots is addressed. Indeed distant quantum dots may experience a sort of individual cloaking. But despite the multiple scattering of an incident electron from a set of adjacent quantum dots, collective cloaking may happen. Via a proper choice of the radii and bias voltages of shells, two most important scattering coefficients and hence the scattering efficiency of the cluster dramatically decrease. Energy-selective electron cloaks are realizable. More importantly, clusters simultaneously transparent to electrons of different energies, are achievable. Being quite sensitive to applied bias voltages, clusters of coreâ??shell quantum dots may be used to develop switches with high on-off ratios.
Download TeX format |
|||||
| back to top | |||||
