Journal
PHYSICAL REVIEW B
Volume 99, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.035403
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Funding
- Singapore National Research Foundation (NRF) [NRF-NRFF2016-05]
- Nanyang Technological University start-up grant (NTU-SUG)
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The spin orientation of electronic wave functions in crystals is an internal degree of freedom, typically insensitive to electrical knobs. We argue from a general symmetry analysis and a k . p perspective, that monolayer 1T'-WTe2 possesses a gate-activated canted spin texture that produces an electrically tunable bulk band quantum geometry. In particular, we find that due to its out-of-plane asymmetry, an applied out-of-plane electric field breaks inversion symmetry to induce both in-plane and out-of-plane electric dipoles. These in-turn generate spin-orbit coupling to lift the spin degeneracy and enable a bulk band Berry curvature and magnetic moment distribution to develop. Further, due to its low symmetry, Berry curvature and magnetic moment in 1T'-WTe2 possess a dipolar distribution in momentum space, and can lead to unconventional effects such as a current induced magnetization and quantum nonlinear anomalous Hall effect. These render 1T'-WTe2 a rich two-dimensional platform for all-electrical control over quantum geometric effects.
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