The Optical Activity of Tellurium

Stolze, Hans H.; Lutz, M.; Große, Peter

doi:10.1002/pssb.2220820206

Cited by 21 publications

(8 citation statements)

References 15 publications

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“…1c ), around which the bottoms of the conduction bands and the tops of the valence bands are located 20 , 21 . The energy dispersion of the uppermost valence band near the H and H’ points is well approximated by , where k = ( k x , k y , k z ) is a wave vector measured from the H or H′ points, A = − 32.6 eV Å 2 , B = − 36.4 eV Å 2 , S = ± 2.47 eV Å ( − for P 3 1 21 and + for P 3 2 21), Δ = 63 meV, and E 0 = 2.4 meV 20 – 26 . Tellurium has spin-polarized isoenegetic surfaces as a result of its strong spin-orbit interaction and inversion asymmetry.…”

Section: Resultsmentioning

confidence: 99%

Observation of current-induced bulk magnetization in elemental tellurium

et al. 2017

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The magnetoelectric effect in bulk matter is of growing interest both fundamentally and technologically. Since the beginning of the century, the magnetoelectric effect has been studied intensively in multiferroic materials. However, magnetoelectric phenomena in materials without any (anti-)ferroic order remain almost unexplored. Here we show the observation of a new class of bulk magnetoelectric effect, by revisiting elemental trigonal tellurium. We demonstrate that elemental tellurium, which is a nonmagnetic semiconductor, exhibits current-induced magnetization. This effect is attributed to spin splitting of the bulk band owing to the lack of inversion symmetry in trigonal tellurium. This finding highlights magnetoelectricity in bulk matter driven by moving electrons without any (anti-)ferroic order. Notably, current-induced magnetization generates a magnetic field that is not circular around but is parallel to the applied current; thus, this phenomenon opens a new area of magnetic field generation beyond Ampere’s law that may lead to industrial applications.

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Section: Resultsmentioning

confidence: 99%

Observation of current-induced bulk magnetization in elemental tellurium

et al. 2017

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“…In Refs. [37,38] it was concluded that the plane of polarization of light rotates in the same sense as the bonded atoms in the spiral chains (with our sign convention, that means ρ 0 > 0 for the right-handed structure), and this has become the "accepted wisdom" in the literature [5,31,39,40]. However, the authors of the most recent study [36] arrived at the opposite conclusion, see Er-ratum [41]: right-handed Te has a negative ρ 0 , in agreement with our calculations.…”

Section: Absolute Sign Of the Optical Rotationmentioning

confidence: 90%

“…12, ρ inter 0 remain negative over the entire doping range. At first its magnitude decreases slightly with increasing N a , due to a depopulation of the upper valence band that blocks some of the interband transitions [40]. It reaches a minimum at N a ≈ 2.5 • 10 18 cm −3 , and then increases rapidly in magnitude.…”

Section: Natural Optical Activity Of Doped Telluriummentioning

confidence: 96%

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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“…3 )tellurium [19]. The chirality of the covalent-bond helices determines the polarities of many physical properties, such as the angular-momentum texture in the k space [20][21][22], natural optical rotatory power [23][24][25][26], secondharmonic generation [27], piezoelectricity [28,29], shapes of etch pits [30], resonant diffraction with circularly polarized x rays [31,32], polarized neutron scattering [33], and NMR chemical shift [34] (see Supplemental Material [19]).…”

Section: Crystal and Electronic Structures Of Trigonal Telluriummentioning

confidence: 99%

Chirality-Induced Electrical Generation of Magnetism in Nonmagnetic Elemental Tellurium

Furukawa,

Watanabe,

Ogasawara

et al. 2020

Preprint

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Chiral matter has a structure that lacks inversion, mirror, and rotoreflection symmetry; thus, a given chiral material has either a right-or left-handed structure. In chiral matter, electricity and magnetism can be coupled in an exotic manner beyond the classical electromagnetism (e.g., magneto chiral effect in chiral magnets). In this paper, we give a firm experimental proof of the linear electric-current-induced magnetization effect in bulk nonmagnetic chiral matter elemental trigonal tellurium. We measured a 125 Te nuclear magnetic resonance (NMR) spectral shift under a pulsed electric current for trigonal tellurium single crystals. We provide general symmetry considerations to discuss the electrically (electric-field-and electric-current-) induced magnetization and clarify that the NMR shift observed in trigonal tellurium is caused by the linear current-induced magnetization effect, not by a higher-order magnetoelectric effect. We also show that the current-induced NMR shift is reversed by a chirality reversal of the tellurium crystal structure. This result is the first direct evidence of crystal-chirality-induced spin polarization, which is an inorganic-bulk-crystal analogue of the chirality-induced spin selectivity in chiral organic molecules. The present findings also show that nonmagnetic chiral crystals may be applied to spintronics and coil-free devices to generate magnetization beyond the classical electromagnetism.

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The Optical Activity of Tellurium

Cited by 21 publications

References 15 publications

Observation of current-induced bulk magnetization in elemental tellurium

Observation of current-induced bulk magnetization in elemental tellurium

Gyrotropic effects in trigonal tellurium studied from first principles

Chirality-Induced Electrical Generation of Magnetism in Nonmagnetic Elemental Tellurium

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