We have discovered a new mechanism for the extreme magnetoresistance (XMR) of order 105% recently reported in rocksalt-structure, nonmagnetic semimetals. Under this mechanism, rather than deriving from topological protection or perfect carrier compensation, XMR can also result from the cooperative action of a substantial difference in hole and electron mobility under moderate carrier compensation.
Significance and Impact
This work challenges prevailing views that topologically nontrivial electronic states or perfect carrier compensation are the exclusive mechanisms for XMR.
- Angle-resolved photoemission spectroscopy (ARPES) studies on high quality single crystals show no fingerprints of topologically nontrivial states such as Dirac or Weyl points, in agreement with first-principles density functional theory calculations.
- Measured Fermi surface allows quantitative estimates of electron and hole concentrations.
- Two-band model, constrained by ARPES charge concentrations, leads to XMR and excellent agreement with measured magnetotransport data.
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