Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical study of Klein quantum dots in graphene system   Klein quantum dot (KQD) refers to a QD with quasi-bound states and a finite
trapping time, which has been observed in experiments focused on graphene
recently. In this paper, we develop a numerical method to calculate local
density of states (LDOS) of KQD and apply it to monolayer graphene. By
investigating the variation of LDOS in a circular quantum dot, we obtain the
dependence of the quasi-bound states on the quantum dot parameters (e.g. the
electron energy, radius, confined potential, etc). Based on these results, not
only can we well explain the experimental phenomena, but also demonstrate how
quasi-bound states turn to real bound states when intervalley scattering is
taken into considered. We further study the evolution of the LDOS for KQD
varying from a circle shape to a semicircle shape, which reveals the mechanism
of whispering gallery mode on the quasi-bound states.

2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ