  By using first-principles electronic structure calculations, we predict that
the extreme magnetoresistance (XMR) material LaSb takes a topological phase
transition without breaking any symmetry under a hydrostatic pressure applied
between 3 and 4 GPa, meanwhile the electron-hole compensation remains in its
electronic band structure. Thus LaSb provides an ideal platform for studying
the individual role of topological property playing in the XMR phenomenon, in
addition to the electron-hole compensation. This has general implication to the
relationship of XMR effect and topological property in topological materials.
