Weyl Fermions: Type I and Type II (IMAGE)
Caption
Left: Allowed states for the standard type-I Weyl fermion. When energy is tuned from below, at zero energy, a pinch in the number of allowed states guarantees the absence of many-body phenomena such as superconductivity or ordering.
Right: The newly discovered type-II Weyl fermion. At zero energy, a large number of allowed states are still available. This allows for the presence of superconductivity, magnetism, and pair-density wave phenomena.
Credit
B. Andrei Bernevig et al.
Usage Restrictions
B. Andrei Bernevig et al.
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