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Direct Observation of Composite Fermions and Their Fully-Spin-Polarized Fermi Sea near <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>5</mml:mn><mml:mo stretchy="false">/</mml:mo><mml:mn>2</mml:mn></mml:math>
Probing the Fermi sea and wave vector of composite fermions address whether they are present, and spin-polarized, in a particular fractional Hall state that is of relevance to topological quantum computing.