TY - JOUR
T1 - Strongly Enhanced Berry Dipole at Topological Phase Transitions in BiTeI
AU - Facio, Jorge I.
AU - Efremov, Dmitri
AU - Koepernik, Klaus
AU - You, Jhih Shih
AU - Sodemann, Inti
AU - Van Den Brink, Jeroen
N1 - Funding Information:
We thank Ulrike Nitzsche for technical assistance. J. v. d. B. acknowledges support from the German Research Foundation (DFG) via SFB 1143. We are thankful to Snehasish Nandy for discussions and to Liang Fu for suggesting BiTeI as a promising platform to study the Berry curvature dipole.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/12/14
Y1 - 2018/12/14
N2 - Transitions between topologically distinct electronic states have been predicted in different classes of materials and observed in some. A major goal is the identification of measurable properties that directly expose the topological nature of such transitions. Here, we focus on the giant Rashba material bismuth tellurium iodine which exhibits a pressure-driven phase transition between topological and trivial insulators in three dimensions. We demonstrate that this transition, which proceeds through an intermediate Weyl semimetallic state, is accompanied by a giant enhancement of the Berry curvature dipole which can be probed in transport and optoelectronic experiments. From first-principles calculations, we show that the Berry dipole - a vector along the polar axis of this material - has opposite orientations in the trivial and topological insulating phases and peaks at the insulator-to-Weyl critical points, at which the nonlinear Hall conductivity can increase by over 2 orders of magnitude.
AB - Transitions between topologically distinct electronic states have been predicted in different classes of materials and observed in some. A major goal is the identification of measurable properties that directly expose the topological nature of such transitions. Here, we focus on the giant Rashba material bismuth tellurium iodine which exhibits a pressure-driven phase transition between topological and trivial insulators in three dimensions. We demonstrate that this transition, which proceeds through an intermediate Weyl semimetallic state, is accompanied by a giant enhancement of the Berry curvature dipole which can be probed in transport and optoelectronic experiments. From first-principles calculations, we show that the Berry dipole - a vector along the polar axis of this material - has opposite orientations in the trivial and topological insulating phases and peaks at the insulator-to-Weyl critical points, at which the nonlinear Hall conductivity can increase by over 2 orders of magnitude.
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U2 - 10.1103/PhysRevLett.121.246403
DO - 10.1103/PhysRevLett.121.246403
M3 - Article
C2 - 30608737
AN - SCOPUS:85059195208
SN - 0031-9007
VL - 121
JO - Physical Review Letters
JF - Physical Review Letters
IS - 24
M1 - 246403
ER -