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James P. Eisenstein
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<p>James P. Eisenstein (born May 15, 1952) is an American physicist. He is currently the Frank J. Roshek Professor of Physics and Applied Physics, Emeritus, at the <a href="/facts/California_Institute_of_Technology/3FPcp7BL">California Institute of Technology</a>. He received a share of the 2025 <a href="/facts/Wolf_Prize_in_Physics/qDA7Jcmn">Wolf Prize in Physics</a> for his experimental research on strongly interacting two-dimensional electron systems. He co-discovered the 5/2 filling factor state of the <a href="/facts/Fractional_quantum_Hall_effect/bkRtdmxX">fractional quantum Hall effect</a> and demonstrated the <a href="/facts/Bose%E2%80%93Einstein_condensation_of_quasiparticles/xtggrAR7">Bose–Einstein condensation</a> of <a href="/facts/Exciton/aFIBtIqQ">excitons</a> in two dimensions. </p>