Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fast, high-resolution surface potential measurements in air with
  heterodyne Kelvin probe force microscopy   Kelvin probe force microscopy (KPFM) adapts an atomic force microscope to
measure electric potential on surfaces at nanometer length scales. Here we
demonstrate that Heterodyne-KPFM enables scan rates of several frames per
minute in air, and concurrently maintains spatial resolution and voltage
sensitivity comparable to frequency-modulation KPFM, the current spatial
resolution standard. Two common classes of topography-coupled artifacts are
shown to be avoidable with H-KPFM. A second implementation of H-KPFM is also
introduced, in which the voltage signal is amplified by the first cantilever
resonance for enhanced sensitivity. The enhanced temporal resolution of H-KPFM
can enable the imaging of many dynamic processes, such as such as
electrochromic switching, phase transitions, and device degredation (battery,
solar, etc.), which take place over seconds to minutes and involve changes in
electric potential at nanometer lengths.

11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an