Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tuning the topological insulator states of artificial graphene   We develop a robust, non-perturbative approach to study the band structure of
artificial graphene. Artificial graphene, as considered here, is generated by
imposing a superlattice structure on top of a two dimensional hole gas in a
semiconductor heterostructure, where the hole gas naturally possesses large
spin-orbit coupling. Via tuning of the system parameters we demonstrate how
best to exploit the spin-orbit coupling to generate time reversal
symmetry-protected topological insulator phases. Our major conclusion is the
identification of a second set of topological Dirac bands in the band structure
(with spin Chern number $C=3$), which were not reliably obtainable in previous
perturbative approaches to artificial graphene. Importantly, the second Dirac
bands host more desirable features than the previously studied first set of
Dirac bands (with $C=1$). Moreover, we find that upon tuning of the system
parameters, we can drive the system to the highly desirable regime of the
topological flat band. We discuss the possibilities this opens up for exotic,
strongly correlated phases.

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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
19
The categories of this paper are: eess
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The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn