Nematic quantum fluids with wavefunctions that break the underlyingcrystalline symmetry can form in interacting electronic systems. We examine thequantum Hall states that arise in high magnetic fields from anisotropic holepockets on the Bi(111) surface. Spectroscopy performed with a scanningtunneling microscope shows that a combination of local strain and many-bodyCoulomb interactions lift the six-fold Landau level (LL) degeneracy to formthree valley-polarized quantum Hall states. We image the resulting anisotropicLL wavefunctions and show that they have a different orientation for eachbroken-symmetry state. The wavefunctions correspond precisely to those expectedfrom pairs of hole valleys and provide a direct spatial signature of a nematicelectronic phase.
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