Thinning ZrTe₅ switches the dominant carriers from electrons to holes
Hall measurements and quantum oscillations revealed a crossover near 40 nm in the relative contributions of electrons and holes.
Fangdong Tang and colleagues compared electrical transport in ZrTe₅ flakes of different thicknesses. The Hall signal indicated the sign of the dominant charge carriers, while quantum oscillations provided information about the Fermi surface.
Electrons dominated in thicker flakes. Once the thickness fell below about 40 nm, holes dominated instead. This crossover makes sample thickness an important variable when comparing transport measurements in ZrTe₅. Liyuan Zhang co-authored the paper.