PHYS-EV0001 - Quantum field theory in condensed matter physics, Lecture, 9.1.2023-6.4.2023
This course space end date is set to 06.04.2023 Search Courses: PHYS-EV0001
Topic outline
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Dirac equation predicts negative and positive energy solutions. To solve the problem of the free electron ground state, Dirac suggested that negative energy states are occupied. The Dirac equation dispersion relations are reminiscent of condensed matter band structures, and the occupied condensed matter states are referred to as the Fermi sea.
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Dirac equation predicted the existence of antiparticles, such as positrons that could be understood as 'holes' in the Dirac sea. The condensed matter analogy is the hole in the Fermi sea. Solar panels work by absorbing photons that create particle-hole-excitations (called excitons). Also (the first steps of) photosynthesis have the same idea.
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