Weyl Semimetal
H(k) = v_F k·σ near Weyl node
Topological charge (Chern number):
C = ±1 (monopole of Berry curvature)
Nielsen-Ninomiya: Weyl points come in ±1 pairs
Fermi arcs: surface states connecting projections of bulk Weyl points
Chiral anomaly: B·E pumps charge between nodes → negative magnetoresistance
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H(k) = v_F k·σ near Weyl node
Topological charge (Chern number):
C = ±1 (monopole of Berry curvature)
Nielsen-Ninomiya: Weyl points come in ±1 pairs
Fermi arcs: surface states connecting projections of bulk Weyl points
Chiral anomaly: B·E pumps charge between nodes → negative magnetoresistance
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