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KTH/Nordita/SU seminar in Theoretical Physics

Fractional Charge in Time-Inversion Invariant Systems

by Roman Jackiw (MIT)

Europe/Stockholm
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Description
The essence of quantum mechanics is that dynamical entities, like energy or angular momentum, which can take arbitrary values within classical physics, become quantized within quantum physics. I shall describe an inverse phenomenon: Classical entities like particle number or charge possess an intrinsic integrality; but they can acquire fractional values upon quantization. I shall describe how this phenomenon is realized through zero modes of a Dirac equation, and how the effect manifests itself in condensed matter materials."