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• W2024257325 abstract "In a single free two-valence-electron atom, the motion of the electron spin is a consequence of quantum statistics and the Pauli exclusion principle. Subsequently, during an electron impact exchange excitation from a ${}^{1}{S}_{0}phantom{rule{0.16em}{0ex}}{M}_{S}=0$ to a ${}^{3}{S}_{1}phantom{rule{0.16em}{0ex}}{M}_{S}=0$ state, the electron spin is ``parallel transported'' around a closed path with a geometrical Berry phase of ensuremath{pi} radians creating an aligned exchange spin angular momentum. This alignment is observed via the Stokes parameter ${P}_{2}$ of the photon decay into a ${}^{3}P$ state. The geometric phase is in addition to the dynamic phase. Measurements from zinc and mercury atoms in different laboratories show the effect close to the excitation threshold where there are no competing excitation processes. Similar effects are expected in other atomic and molecular quantum scattering processes where comparable geometrical or topological paths exist. Electron quantum scattering theories use antisymmetrized wave functions but none include this geometrical exchange angular momentum." @default.
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• W2024257325 date "2012-02-06" @default.
• W2024257325 modified "2023-10-14" @default.
• W2024257325 title "Topological angular momentum in electron exchange excitation of a single atom" @default.
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• W2024257325 doi "https://doi.org/10.1103/physreva.85.022701" @default.
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