%0 Journal Article %1 PhysRevB.103.115428 %A Liu, Hui %A Franca, Selma %A Moghaddam, Ali G. %A Hassler, Fabian %A Fulga, Ion Cosma %D 2021 %I American Physical Society %J Phys. Rev. B %K a c %N 11 %P 115428 %R 10.1103/PhysRevB.103.115428 %T Network model for higher-order topological phases %U https://link.aps.org/doi/10.1103/PhysRevB.103.115428 %V 103 %X We introduce a two-dimensional network model that realizes a higher-order topological phase (HOTP). We find that in the HOTP the bulk and boundaries of the system are gapped, and a total of 16 corner states are protected by the combination of a fourfold rotation, a phase-rotation, and a particle-hole symmetry. In addition, the model exhibits a strong topological phase at a point of maximal coupling. This behavior is in opposition to conventional network models, which are gapless at this point. By introducing the appropriate topological invariants, we show how a point group symmetry can protect a topological phase in a network. Our work provides the basis for the realization of HOTP in alternative experimental platforms implementing the network model

@article{PhysRevB.103.115428, abstract = {We introduce a two-dimensional network model that realizes a higher-order topological phase (HOTP). We find that in the HOTP the bulk and boundaries of the system are gapped, and a total of 16 corner states are protected by the combination of a fourfold rotation, a phase-rotation, and a particle-hole symmetry. In addition, the model exhibits a strong topological phase at a point of maximal coupling. This behavior is in opposition to conventional network models, which are gapless at this point. By introducing the appropriate topological invariants, we show how a point group symmetry can protect a topological phase in a network. Our work provides the basis for the realization of HOTP in alternative experimental platforms implementing the network model}, added-at = {2023-06-07T14:28:07.000+0200}, author = {Liu, Hui and Franca, Selma and Moghaddam, Ali G. and Hassler, Fabian and Fulga, Ion Cosma}, biburl = {https://www.bibsonomy.org/bibtex/2ee4a083f602fdc097ba88a1ffe70c2a9/ctqmat}, day = 17, description = {Network model for higher-order topological phases}, doi = {10.1103/PhysRevB.103.115428}, interhash = {8ff1f724ec03da6b0996943b653b5ac6}, intrahash = {ee4a083f602fdc097ba88a1ffe70c2a9}, journal = {Phys. Rev. B}, keywords = {a c}, month = {03}, number = 11, numpages = {13}, pages = 115428, publisher = {American Physical Society}, timestamp = {2023-06-07T14:28:07.000+0200}, title = {Network model for higher-order topological phases}, url = {https://link.aps.org/doi/10.1103/PhysRevB.103.115428}, volume = 103, year = 2021 }