N.M.R. orbital shifts of 125Te in solids, dependence on ionicity and local structure

Willig, A.; Sapoval, B.

doi:10.1051/jphyslet:0197700380205700

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…Within the LCAO approach (13), the lattice periodic functions within a unit cell are written as a linear combination of the two atomic orbitals. The relative weight between the two orbitals is related to the ionicity and found to be 112,113 α Te ≃ √ 0.8 and α Hg ≃ √ 0.2, (D2)…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Hyperfine interactions in two-dimensional HgTe topological insulators

Lunde

Platero

2013

Phys. Rev. B

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We study the hyperfine interaction between the nuclear spins and the electrons in a HgTe quantum well, which is the prime experimentally realized example of a two-dimensional topological insulator. The hyperfine interaction is a naturally present, internal source of broken time-reversal symmetry from the point of view of the electrons. The HgTe quantum well is described by the so-called Bernevig-Hughes-Zhang (BHZ) model. The basis states of the BHZ model are combinations of both S-and P -like symmetry states, which means that three kinds of hyperfine interactions play a role: (i) the Fermi contact interaction, (ii) the dipole-dipole-like coupling, and (iii) the electron-orbital to nuclear-spin coupling. We provide benchmark results for the forms and magnitudes of these hyperfine interactions within the BHZ model, which give a good starting point for evaluating hyperfine interactions in any HgTe nanostructure. We apply our results to the helical edge states of a HgTe two-dimensional topological insulator and show how their total hyperfine interaction becomes anisotropic and dependent on the orientation of the sample edge within the plane. Moreover, for the helical edge states, the hyperfine interaction due to the P -like states can dominate over the S-like contribution in certain circumstances.

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Section: Acknowledgmentsmentioning

confidence: 99%

“…The relative weight between the two orbitals is related to the ionicity and found to be 112,113 α Te √ 0.8 and α Hg √ 0.2,…”

Section: Appendix B: Normalization Of the Bhz Statesmentioning

confidence: 99%

Hyperfine interactions in two-dimensional HgTe topological insulators

Lunde

Platero

2013

Phys. Rev. B

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“…However, it is also characterized by a long spin-lattice relaxation time T 1 and displays a large chemical shift range of several thousands of ppm that can make high-resolution 125 Te NMR spectroscopy in the solid state experimentally challenging [4]. Nevertheless, 125 Te solid state NMR spectroscopy has been used extensively for establishment of its chemical shift scale and structural characterization of Te coordination environments in inorganic tellurium salts, MTe (M = Pb, Zn) semiconductors, tellurium oxide based (tellurite) crystals and glasses, transition metal tellurides and organo-metallic compounds [4][5][6][7][8]. However, the chemical shift systematics of 125 Te remain practically unexplored in crystalline and amorphous chalcogenide materials in the Ge-Sb-As-Te system.…”

Section: Introductionmentioning

confidence: 99%

125Te NMR chemical shifts and tellurium coordination environments in crystals and glasses in the Ge–As–Sb–Te system

Edwards

Gjersing

Sen

et al. 2011

Journal of Non-Crystalline Solids

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“…25 Semiconducting MTe compounds (M = Hg, Zn, Cd, Pb or Sn) have been studied previously by solid-state NMR spectroscopy. [26][27][28][29] At room temperature the 125 Te shifts range from δ Ϫ1600 to Ϫ1900 ppm in the undoped state. Data on organotellurium compounds are derived from solution studies and they range from δ Ϫ1920 to 530 ppm.…”

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confidence: 99%