Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higher-Order Topological Instanton Tunneling Oscillation   We propose a new type of instanton interference effect in two-dimensional
higher-order topological insulators. The intercorner tunneling consists of the
instanton and the anti-instanton pairs that travel through the boundary of the
higher-order topological insulator. The Berry phase difference between the
instanton pairs causes the interference of the tunneling. This topological
effect leads to the gate-tunable oscillation of the energy splitting between
the corner states, where the oscillatory nodes signal the perfect suppression
of the tunneling. We suggest this phenomenon as a unique feature of the
topological corner states that differentiate from trivial bound states. In the
view of experimental realization, we exemplify twisted bilayer graphene, as a
promising candidate of a two-dimensional higher-order topological insulator.
The oscillation can be readily observed through the transport experiment that
we propose. Thus, our work provides a feasible route to identify higher-order
topological materials.

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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
1
The categories of this paper are: cs
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The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio