Hopf semimetals are 4D gapless phases constructed via unstable homotopy maps from T^3 to S^2 that host nodal lines carrying Hopf flux along with unique gapless Fermi-arc, drumhead, Fermi-surface, and corner states.
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Twinning suppression via substrate step-edge alignment in thin SrIrO3 films on SrTiO3 allows observation of thickness-dependent electronic anisotropy up to twice the value in strain-free films.
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Hopf Semimetals
Hopf semimetals are 4D gapless phases constructed via unstable homotopy maps from T^3 to S^2 that host nodal lines carrying Hopf flux along with unique gapless Fermi-arc, drumhead, Fermi-surface, and corner states.
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Suppression of twinning and enhanced electronic anisotropy of SrIrO3 films
Twinning suppression via substrate step-edge alignment in thin SrIrO3 films on SrTiO3 allows observation of thickness-dependent electronic anisotropy up to twice the value in strain-free films.