Fractional corner charges in spin-orbit coupled crystals
نویسندگان
چکیده
منابع مشابه
Filling-enforced quantum band insulators in spin-orbit coupled crystals
An early triumph of quantum mechanics was the explanation of metallic and insulating behavior based on the filling of electronic bands. A complementary, classical picture of insulators depicts electrons as occupying localized and symmetric Wannier orbitals that resemble atomic orbitals. We report the theoretical discovery of band insulators for which electron filling forbids such an atomic desc...
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We determine conditions on the filling of electrons in a crystalline lattice to obtain the equivalent of a band insulator--a gapped insulator with neither symmetry breaking nor fractionalized excitations. We allow for strong interactions, which precludes a free particle description. Previous approaches that extend the Lieb-Schultz-Mattis argument invoked spin conservation in an essential way an...
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ژورنال
عنوان ژورنال: Physical Review Research
سال: 2019
ISSN: 2643-1564
DOI: 10.1103/physrevresearch.1.033074