Comment on "Piezoelectricity in planar boron nitride via a geometric phase"
Abstract
Using the strain-dependent effective Hamiltonian and the geometric phase, Droth et al. [Phys. Rev. B 94, 075404 (2016), 10.1103/PhysRevB.94.075404] obtain an analytical expression for the electronic contribution to the piezoelectricity of planar hexagonal boron nitride (h -BN). Their analytical results of piezoelectric constants for h -BN are invalid because of the mistakes in constructing the adiabatic process of the piezoelectricity. In this Comment, we reconstruct a proper adiabatic process for piezoelectricity and formulate a general Berry phase expression for the piezoelectric coefficients of two-dimensional piezoelectric crystals by means of the modern theory of polarization. The corrected analytical results of the piezoelectric constants are in complete consistency with the first-principles calculations and hence manifest the validity and generality of the Berry phase expression of piezoelectric coefficients.
- Publication:
-
Physical Review B
- Pub Date:
- October 2018
- DOI:
- 10.1103/PhysRevB.98.167403
- arXiv:
- arXiv:1708.00384
- Bibcode:
- 2018PhRvB..98p7403L
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- Phys. Rev. B 98, 167403 (2018)