Zengwei Zhu

Field-induced polarization of Dirac valleys in bismuth

Multiple valleys in the electronic structure of certain crystal lattices could enable the development of so-called valleytronic devices. But to do so, the degeneracy of these valleys must be lifted. Measurements of the anisotropic magnetoelectric response of bismuth suggest that its three-fold valley degeneracy breaks spontaneously at low temperatures and high fields.

Antiferromagnetic transition in EuFe2As2: a possible parent compound for superconductors

Ternary iron arsenide EuFe

Unconventional Fermi surface in an insulating state

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Effects of cobalt doping and phase diagrams of LFe1-xCox AsO (L=La and Sm)

As

Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor

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Metamagnetic transition in EuFe2As2 single crystals

with ThCr

Fermi Surface of the Most Dilute Superconductor

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Metamagnetic transition in EuFe 2 As 2 single crystals

Si

Angle-resolved Landau spectrum of electrons and holes in bismuth

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Nernst effect and dimensionality in the quantum|[nbsp]|limit

-type structure has been studied by magnetic susceptibility, resistivity, thermopower, Hall and specific heat measurements. The compound undergoes two magnetic phase transitions at about 200 K and 20 K, respectively. The former was found to be accompanied with a slight drop in magnetic susceptibility (after subtracting the Curie-Weiss paramagnetic contribution), a rapid decrease in resistivity, a large jump in thermopower and a sharp peak in specific heat with decreasing temperature, all of which point to a spin-density-wave-like antiferromagnetic transition. The latter was proposed to be associated with an A-type antiferromagnetic ordering of Eu