Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Valence band structure calculations of strained Ge$_{1-x}$Sn$_x$ quantum
  well pFETs   The dependence of valence band structures of Ge$_{1-x}$Sn$_x$ with 0 $\leq$
$x$ $\leq$ 0.2 on Sn content, biaxial strain, and substrate orientation is
calculated using the nonlocal empirical pseudopotential method. The first
valence subband structure in p-type Ge cap/fully strained Ge$_{1-x}$Sn$_x$
quantum well/Ge (001) and (111) inversion layers are theoretically studied
using the 6$\times$6 k$\cdot$p model. A wave-function coupling of a Ge cap with
respect to a strained Ge$_{1-x}$Sn$_x$ quantum well, which is influenced by the
cap thickness, valence band offset, and confined effective mass, changes the
energy dispersion relation in the two-dimensional $k$-space. The increase in Sn
content and the decrease in cap thickness increase the hole population in the
strained Ge$_{1-x}$Sn$_x$ quantum well to reduce the transport effective mass
at the zone center in the Ge/strained Ge$_{1-x}$Sn$_x$/Ge inversion layers.

5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
2
The categories of this paper are: math
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat