Unconventional Quantum Hall Effect and Tunable Spin Hall Effect in MoS2 Trilayers
Abstrak
We analyze the Landau level (LL) structure and spin Hall effect in a MoS2 trilayer. Due to orbital asymmetry, the low-energy Dirac fermions become heavily massive and the LL energies grow linearly with $B$, rather than with $\sqrt{B}$. Spin-orbital couplings break spin and valley degenerate LL's into two time reversal invariant groups, with LL crossing effects present in the valence bands. We find a field-dependent unconventional Hall plateau sequence $ν=...$ $-2M-6$, $-2M-4$, $-2M-2$, $-2M-1$, ..., -5, -3, -1, 0, 2, 4 .... In a p-n junction, spin-resolved fractionally quantized conductance appears in two-terminal measurements with a controllable spin-polarized current that can be probed at the interface. We also show the tunability of zero-field spin Hall conductivity.
Topik & Kata Kunci
Penulis (3)
Xiao Li
Fan Zhang
Qian Niu
Akses Cepat
- Tahun Terbit
- 2012
- Bahasa
- en
- Sumber Database
- arXiv
- Akses
- Open Access ✓