Program

P.63 -- Poster, NCTP-40

Date: Tuesday, 28 July 2015

Time: 08h30 - 10h00

Quasi-bound states in circular graphene quantum dots

Nhung T. T. Nguyen (1), D. Quang To (1), and H. Chau Nguyen (2)

(1) Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam; (2) Institute for Theoretical Physics - University of Cologne, Germany.

We study quasi-bound states of Dirac electrons in circular graphene quantum dots. We show that known results about the life-times of quasi-bound states in quantum dots modelled by one-step potentials can be derived in a comprehensive way. We then extend this study to investigate the effects of the slope of the confinement potential on the quasi-bound states. We found that while the energy levels stay roughly the same, the life-times of these quasi-bound states are strongly increased by the decreasing of the slope of the confinement potential. This is qualitatively in agreement with known results for one-dimensional confinement potential, which suggest that the life-time of quasi-bound states in two dimension can also be controlled by controlling the slope of the confinement potential.

Presenter: To Duy Quang