Monday, June 10, 2013

1306.1747 (Joonbum Park et al.)

Spin-Chiral Bulk Fermi Surfaces of BiTeI Proven by Quantum Oscillations    [PDF]

Joonbum Park, E. Kampert, Kyung-Hwan Jin, Man Jin Eom, Jongmok Ok, E. S. Choi, F. Wolff-Fabris, K. D. Lee, N. Hur, J. -S Rhyee, Y. J. Jo, Seung-Hoon Jhi, Jun Sung Kim
We present the Fermi-surface map of the spin-chiral bulk states for the non-centrosymmetric semiconductor BiTeI using de Haas-van Alphen and Shubnikov-de Haas oscillations. We identify two distinct Fermi surfaces with a unique spindle-torus-type topology and the non-trivial Berry phases, confirming the spin chirality with oppositely circulating spin-texture. Near the quantum limit at high magnetic fields, we find a substantial Zeeman effect with an effective g-factor of ~ 60 for the Rashba-split Fermi surfaces. These findings provide clear evidence of strong Rashba and Zeeman coupling in the bulk states of BiTeI, suggesting that BiTeI is a good platform hosting the spin-polarized chiral states.
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