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We present observations of an anisotropic resistance state at Landau levelfilling factor $\nu=5/2$ in a two-dimensional hole system (2DHS), which occursfor certain values of hole density $p$ and average out-of-plane electric field$E_\perp$. The 2DHS is induced by electric field effect in an undopedGaAs/AlGaAs quantum well, where front and back gates allow independent tuningof $p$ and $E_\perp$, and hence the symmetry of the confining potential. For$p\approx2\times10^{11}$~cm$^{-2}$ and $E_\perp \approx -2 \times10^{5}$~V/m,the magnetoresistance along $\langle01\bar1\rangle$ greatly exceeds that along$\langle011\rangle$, suggesting the formation of a quantum Hall nematic or`stripe' phase. Reversing the sign of $E_\perp$ rotates the stripes by$90^{\circ}$. We suggest this behavior may arise from the mixing of the holeLandau levels and a combination of the Rashba and Dresselhaus spin-orbitcoupling effects.

Orientation of hole quantum Hall nematic phases in an out-of-plane electric field