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Coexisting Charge Density Waves in Twisted Bilayer NbSe2.

Christopher T S Cheung1, Zachary A H Goodwin2, Yixuan Han3

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Twisted bilayer niobium diselenide (NbSe2) exhibits coexisting charge density wave states. Different ordered states appear in stacking regions and domain walls, offering tunable electronic properties.

Keywords:
2D materialscharge density wavesfirst-principles simulationtwistronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • Twisted bilayers of 2D materials offer a tunable platform for exploring broken symmetry phases.
  • Investigating twisted bilayers composed of monolayers with inherent ordered states can lead to novel phenomena.
  • Niobium diselenide (NbSe2) monolayers exhibit charge density wave (CDW) order.

Purpose of the Study:

  • To investigate the atomic structure and emergent phenomena in twisted bilayer NbSe2.
  • To understand the interplay between constituent monolayer CDW states and bilayer stacking.
  • To predict the ground state CDW configurations in twisted bilayer NbSe2.

Main Methods:

  • Utilized first-principles density-functional theory (DFT) calculations.
  • Analyzed the atomic structure of twisted bilayer NbSe2 at various stacking configurations.
  • Simulated the charge density wave states within the twisted bilayer system.

Main Results:

  • Identified the coexistence of distinct CDW states in the twisted bilayer NbSe2 ground state.
  • Observed monolayer-like 3x3 triangular and hexagonal CDW states in low-energy stacking regions.
  • Found stripe CDW states localized in the domain walls surrounding these low-energy regions.

Conclusions:

  • The ground state of twisted bilayer NbSe2 hosts a complex interplay of different CDW phases.
  • Stacking configurations significantly influence the resulting CDW order in the bilayer.
  • These findings provide testable predictions for scanning tunneling microscopy (STM) experiments and highlight potential for complex CDW engineering.