Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hole transport in p-type GaAs quantum dots and point contacts   Strong spin-orbit interaction characteristic for p-type GaAs systems, makes
such systems promising for the realization of spintronic devices. Here we
report on transport measurements in nanostructures fabricated on p-type,
C-doped GaAs heterostructures by scanning probe oxidation lithography. We
observe conductance quantization in a quantum point contact, as well as
pronounced Coulomb resonances in two quantum dots with different geometries.
Charging energies for both dots, extracted from Coulomb diamond measurements
are in agreement with the lithographic dimensions of the dots. The absence of
excited states in Coulomb diamond measurements indicates that the dots are in
the multi-level transport regime.

25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex