4.8 Article

Zitterbewegung of Moire Excitons in Twisted MoS2/WSe2 Heterobilayers

期刊

PHYSICAL REVIEW LETTERS
卷 127, 期 10, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.106801

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资金

  1. Brazilian Council for Research (CNPq), through the PRONEX/FUNCAP program
  2. Brazilian Council for Research (CNPq) through Universal program
  3. Brazilian Council for Research (CNPq) through PQ program
  4. Brazilian National Council for the Improvement of Higher Education (CAPES)
  5. Research Foundation-Flanders (FWO)

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The study reveals that moire excitons in heterobilayers exhibit a band structure similar to Dirac-Weyl fermions and demonstrate Zitterbewegung motion on long timescales, providing an advantageous solid-state platform for exploring Zitterbewegung.
The moire pattern observed in stacked noncommensurate crystal lattices, such as heterobilayers of transition metal dichalcogenides, produces a periodic modulation of their band gap. Excitons subjected to this potential landscape exhibit a band structure that gives rise to a quasiparticle dubbed the moire exciton. In the case of MoS2/WSe2 heterobilayers, the moire trapping potential has honeycomb symmetry and, consequently, the moire exciton band structure is the same as that of a Dirac-Weyl fermion, whose mass can be further tuned down to zero with a perpendicularly applied field. Here we show that, analogously to other Dirac-like particles, the moire exciton exhibits a trembling motion, also known as Zitterbewegung, whose long timescales are compatible with current experimental techniques for exciton dynamics. This promotes the study of the dynamics of moire excitons in van der Waals heterostructures as an advantageous solid-state platform to probe Zitterbewegung, broadly tunable by gating and interlayer twist angle.

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