Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robust and tunable Weyl phases by coherent infrared phonons in ZrTe$_5$   Ultrafast optical control of the structural and electronic properties of
various quantum materials has recently sparked great interest. In particular,
photoinduced quantum phase transition between distinct topological phases has
been considered as a promising route to realize ultrafast topological quantum
computers. Here we use first-principles and effective Hamiltonian methods to
show that in ZrTe$_5$, a layered topological material, lattice distortions
corresponding to all three types of zone-center infrared optical phonon modes
can drive the system from the strong or weak topological insulating phase to a
Weyl semimetal by breaking the global inversion symmetry. Thus achieved Weyl
phases are robust, highly tunable and one of the cleanest ones due to the
proximity of the Weyl points to the Fermi level and a lack of other carriers.
We further show that the amount of infrared-mode pumping necessary to induce
such Weyl phases can be reduced if used in conjunction with an A$_g$ Raman-mode
pumping that first drives the system to the Dirac semimetal state. We also find
that Berry curvature dipole moment (BCDM), induced by the dynamical inversion
symmetry breaking, gives rise to various nonlinear effects that oscillate with
the amplitude of the phonon modes. These nonlinear effects present a novel
switch for controlling the Weyltronics enabled quantum system.

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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: econ