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Area of Science:

  • Condensed Matter Physics
  • Topological Materials

Background:

  • Nodal line semimetals feature unique bulk-band crossings.
  • These crossings create nearly flat drumhead-like surface states (DSS).
  • DSS are promising for studying interaction-induced emergent phenomena.

Purpose of the Study:

  • Investigate the impact of electronic interactions on DSS in nodal line semimetals.
  • Determine if these interactions can lead to novel topological phases.
  • Explore the potential for realizing dissipationless electron transport.

Main Methods:

  • Theoretical analysis of electronic interactions within DSS.
  • Inclusion of spin-orbit coupling effects.
  • Investigation of topological charge and Chern number in surface states.

Main Results:

  • Electronic interactions drive a Stoner ferromagnetic instability in DSS, distinct from the bulk.
  • Combined with spin-orbit coupling, this instability transforms DSS into a 2D Chern insulator.
  • Each DSS segment possesses a half-integer topological charge, leading to a net Chern number of C=-1 for systems with two DSS segments.
  • The resulting topological state is robust against chiral-symmetry breaking.

Conclusions:

  • Nodal line semimetals serve as a viable platform for realizing surface Chern insulators.
  • Exploiting enhanced interaction effects in DSS can lead to dissipationless electron transport.
  • This work opens avenues for novel topological quantum devices.