Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong Transport Anisotropy in a Ge/SiGe Quantum Well in Tilted Magnetic
  Fields   We report on a strong transport anisotropy in a 2D hole gas in a Ge/SiGe
quantum well, which emerges only when both perpendicular and in-plane magnetic
fields are present. The ratio of resistances, measured along and perpendicular
to the in-plane field, can exceed $3\times 10^4$. The anisotropy occurs in a
wide range of filling factors where it is determined {\em primarily} by the
tilt angle. The lack of significant anisotropy without an in-plane field, easy
tunability, and persistence to higher temperatures and filling factors set this
anisotropy apart from nematic phases in GaAs/AlGaAs.

19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th