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24 April 2024 |
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Dynamical Piezomagnetic Effect in Time-Reversal Invariant Weyl Semimetals with Axionic Charge-Density Waves | | Jiabin Yu
; Benjamin J. Wieder
; Chao-Xing Liu
; | | Date: |
Mon, 24 Aug 2020 18:00:15 GMT (1870kb,D) | | Abstract: | Charge-density waves (CDWs) in Weyl semimetals (WSMs) have been shown to
induce an exotic axionic insulating phase in which the sliding mode (phason) of
the CDW acts as a dynamical axion field, giving rise to a large positive
magneto-conductance. In this work, we predict that dynamical strain can induce
a bulk orbital magnetization in time-reversal- (TR-) invariant WSMs that are
gapped by a CDW. We term this effect the "dynamical piezomagnetic effect"
(DPME). Unlike in [J. Gooth et al, Nature 575, 315 (2019)], the DPME introduced
in this work occurs in a bulk-constant (i.e., static and spatially homogeneous
in the bulk) CDW, and does not rely on fluctuations, such as a phason. By
studying the low-energy effective theory and a minimal tight-binding (TB)
model, we find that the DPME originates from an effective valley axion field
that couples the electromagnetic gauge field with a strain-induced pseudo-gauge
field. We further find that the DPME has a discontinuous change at a critical
value of the phase of the CDW order parameter. We demonstrate that, when there
is a jump in the DPME, the surface of the system undergoes a topological
quantum phase transition (TQPT), while the bulk remains gapped. Hence, the DPME
provides a bulk signature of the boundary TQPT in a TR-invariant Weyl-CDW. | | Source: | arXiv, 2008.10620 | | Services: | Forum | Review | PDF | Favorites | |
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