Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Environmentally Stable Room Temperature Continuous Wave Lasing in
  Defect-passivated Perovskite   Metal halide perovskites have emerged as promising gain materials for on-chip
lasers in photonic integrated circuits (PICs). However, stable continuous wave
(CW) lasing behavior under optical pumping at room temperature - a prerequisite
for electrically pumped lasing - has not yet been demonstrated. To achieve
stable CW operation, we introduce a multiplex of strategies that include
morphological, structural and interfacial engineering of CH3NH3PbBr3 (MAPbBr3)
thin films to improve perovskite's intrinsic stability, as well as high quality
cavity design to reduce the operational power. We demonstrate for the first
time, over 90-minute-long green CW lasing with 9.4W/cm2 threshold from a
polycarbonate (PC)-defect-passivated, directly patterned MAPbBr3
two-dimensional photonic crystal (PhC) cavity without any substrate cooling. We
also show our approach's effectiveness on the performance of MAPbBr3 under
electrical excitation: we observe a seven-fold current efficiency enhancement
by applying our strategies to a MAPbBr3 LED. This work paves the way to the
realization of electrically pumped lasing in perovskites.

4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex