Pancharatnam-Berry phase and kinetic magnetoelectric effect in trigonal tellurium

Şahin, Cüneyt; Rou, Janvida; Ma, Jing; Pesin, D. A.

doi:10.1103/physrevb.97.205206

Cited by 41 publications

(35 citation statements)

References 44 publications

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“…Note added: After this work was submitted, a complementary theoretical study of the kME in p-Te appeared [48]. The authors used a k·p model to investigate extrinsic as well as intrinsic contributions to the kFE.…”

Section: Discussionmentioning

confidence: 99%

Gyrotropic effects in trigonal tellurium studied from first principles

2018

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We present a combined ab initio study of several gyrotropic effects in p-doped trigonal tellurium (effects that reverse direction with the handedness of the spiral chains in the atomic structure). The key ingredients in our study are the k-space Berry curvature and intrinsic orbital magnetic moment imparted on the Bloch states by the chirality of the crystal structure. We show that the observed sign reversal with temperature of the circular photogalvanic effect can be explained by the presence of Weyl points near the bottom of the conduction band acting as sources and sinks of Berry curvature. The passage of a current along the trigonal axis induces a rather small parallel magnetization, which can nevertheless be detected by optical means (Faraday rotation of transmitted light) due to the high transparency of the sample. In agreement with experiment, we find that when infrared light propagates antiparallel to the current at low doping the current-induced optical rotation enhances the natural optical rotation. According to our calculations the plane of polarization rotates in the opposite sense to the bonded atoms in the spiral chains, in agreement with a recent experiment that contradicts earlier reports.

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Section: Discussionmentioning

confidence: 99%

Gyrotropic effects in trigonal tellurium studied from first principles

2018

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“…1, top left panel). The GME tensor α ij also characterizes the 'inverse GME' 45,[91][92][93][94][95][96][97] , where a magnetization M i is produced in response to an applied electric field (in the presence of time-reversal symmetry):…”

Section: B the Gyrotropic Magnetic Effectmentioning

confidence: 99%

Chiral optical response of multifold fermions

et al. 2018

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Multifold fermions are generalizations of two-fold degenerate Weyl fermions with three-, four-, sixor eight-fold degeneracies protected by crystal symmetries, of which only the last type is necessarily non-chiral. Their low energy degrees of freedom can be described as emergent relativistic particles not present in the Standard Model of particle physics. We propose a range of experimental probes for multifold fermions in chiral symmetry groups based on the gyrotropic magnetic effect (GME) and the circular photo-galvanic effect (CPGE). We find that, in contrast to Weyl fermions, multifold fermions can have zero Berry curvature yet a finite GME, leading to an enhanced response. The CPGE is quantized and independent of frequency provided that the frequency region at which it is probed defines closed optically-activated momentum surfaces. We confirm the above properties by calculations in symmetry-restricted tight binding models with realistic density functional theory parameters. We identify a range of previously-unidentified ternary compounds able to exhibit chiral multifold fermions of all types (including a range of materials in the families AsBaPt and Gd3Cl3C), and provide specific predictions for the known multifold material RhSi. arXiv:1806.09642v2 [cond-mat.mes-hall]

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“…This effect corresponds to a current induced longitudinal magnetization present in all chiral conductors [11] and therefore implies the existence of a strong eMChA in t-Te. Theoretical work has addressed several contributions to the inverse eMChA in t-Te (see [25] and references therein) but cannot be straightforwardly adapted to make quantitative predictions for the direct eMChA effect. Single crystals of zone refined t-Te (purity better than 99,9999%) were commercially obtained [27].…”

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confidence: 99%