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We study the effect of electron-electron interactions on the charge and spinstructures of a Quantum Hall strip in a triangularly confined potential. Wefind that the strip undergoes a spin-unpolarized to spin-polarized transitionas a function of magnetic field perpendicular to the strip. For sharpconfinements the spin-polarization transition is spontaneous and first developsat the softer side of the triangular potential which shows up as an"eye-structure" in the electron dispersion. For sufficiently weak confinementsthis spin-polarization transition is preceded by a charge reconstruction of asingle spin species, which creates a spin-polarized strip of electrons with awidth of the order of the magnetic length detached from the rest of the system.Relevance of our findings to the recent momentum resolved tunneling experimentsis also discussed.

Charge and Spin Reconstruction in Quantum Hall Strips