Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Layer-dependent pressure effect on electronic structures of 2D black
  phosphorus   Through infrared spectroscopy, we systematically study the pressure effect on
electronic structures of few-layer black phosphorus (BP) with layer number
ranging from 2 to 13. We reveal that the pressure-induced shift of optical
transitions exhibits strong layer-dependence. In sharp contrast to the bulk
counterpart which undergoes a semiconductor to semimetal transition under ~1.8
GPa, the bandgap of 2 L increases with increasing pressure until beyond 2 GPa.
Meanwhile, for a sample with a given layer number, the pressure-induced shift
also differs for transitions with different indices. Through the tight-binding
model in conjunction with a Morse potential for the interlayer coupling, this
layer- and transition-index-dependent pressure effect can be fully accounted.
Our study paves a way for versatile van der Waals engineering of
two-dimensional BP.

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The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org