Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intra-cell dynamics and cyclotron motion without magnetic field   Intra-cell motion endows rich non-trivial phenomena to a wide variety of
quantum materials. The most prominent example is a transverse current in the
absence of a magnetic field (i.e. the anomalous Hall effect). Here we show
that, in addition to a dc Hall effect, anomalous Hall materials possess
circulating currents and cyclotron motion without magnetic field. These are
generated from the intricate wavefunction dynamics within the unit cell, and
correspond to interband transitions (coherences) in much the same way that
cyclotron resonances arise from inter-Landau level transitions in
magneto-optics. Curiously, anomalous cyclotron motion exhibits an intrinsic
decay in time (even in pristine materials) displaying a characteristic power
law decay. This reveals an intrinsic dephasing similar to that of inhomogeneous
broadening of spinors. Circulating currents can manifest as the emission of
circularly polarized light pulses in response to incident linearly polarized
(pulsed) electric field, and provide a direct means of interrogating the
intra-unit-cell dynamics of quantum materials.

18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th