Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Individual electron and hole localization in submonolayer InN quantum
  sheets embedded in GaN   We investigate sub-monolayer InN quantum sheets embedded in GaN(0001) by
temperature-dependent photoluminescence spectroscopy under both continuous-wave
and pulsed excitation. Both the peak energy and the linewidth of the emission
band associated with the quantum sheets exhibit an anomalous dependence on
temperature indicative of carrier localization. Photoluminescence transients
reveal a power law decay at low temperatures reflecting that the recombining
electrons and holes occupy spatially separate, individual potential minima
reminiscent of conventional (In,Ga)N(0001) quantum wells exhibiting the
characteristic disorder of a random alloy. At elevated temperatures, carrier
delocalization sets in and is accompanied by a thermally activated quenching of
the emission. We ascribe the strong nonradiative recombination to extended
states in the GaN barriers and confirm our assumption by a simple rate-equation
model.

17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int