Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice Vibrational Modes and their Frequency Shifts in Semiconductor
  Nanowires   We have performed first-principles calculations to study the lattice
vibrational modes and their Raman activities in silicon nanowires (SiNWs). Two
types of characteristic vibrational modes are examined: high-frequency optical
modes and low-frequency confined modes. Their frequencies have opposite size
dependence with a red shift for the optical modes and a blue shift for the
confined modes as the diameter of SiNWs decreases. In addition, our
calculations show that these vibrational modes can be detected by Raman
scattering measurements, providing an efficient way to estimate the size of
SiNWs.

35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs