Abstract:
In this article, we study non-trivial topological phase and electron-hole compensation in extremely large
magnetoresistance (XMR) material YSb under hydrostatic pressure using first-principles calculations. YSb is
topologically trivial at ambient pressure, but undergoes a reentrant topological phase transition under hydrostatic
pressure. The reentrant behavior of topological quantum phase is then studied as a function of charge
density ratio under pressure. From the detailed investigation of Fermi surfaces, it is found that electron to hole
densities ratio increases with pressure, however a non-trivial topological phase appears without perfect electronhole
compensation. The results indicate that the non-trivial topological phase under hydrostatic pressure may not
have maximal influence on the magnetoresistance, and need further investigations through experiments to
determine the exact relationship between topology and XMR effect.
