2014/12/31 by Cheng-Cheng Liu, Cheng‐Cheng Liu, Jin-Jian Zhou +1
Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Ferromagnetism #Geometric phase #Honeycomb #Magnetic field #Magnetization #Materials science #Monolayer #Nanotechnology #Phase (matter) #Physics #Quantum Hall effect #Quantum anomalous Hall effect #Quantum many-body systems #Quantum mechanics #Spintronics #Topological Materials and Phenomena #Topology (electrical circuits) #Valleytronics #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.other
paper · pdf · doi:10.1103/physrevb.91.165430
published as PhysRevB.91.165430, 2015 · 9 figures
openalex publication_date 2015/04/27 · arxiv created 2015/04/28 · arxiv updated 2015/04/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Based on first-principles calculations, we find novel valley-polarized quantum anomalous Hall (VP-QAH) phases with a large gap---0.19 eV at an appropriate buckled angle and tunable topological phase transitions driven by the spontaneous magnetization within a half-hydrogenated Bi honeycomb monolayer. Depending on the magnetization orientation, four different phases can emerge, i.e., two VP-QAH phases, ferromagnetic insulating, and metallic states. When the magnetization is reversed from the +z to the \ensuremath-z directions, accompanied with a sign change in the Chern number (from \ensuremath-1 to +1), the chiral edge state is moved from valley K to K^\ensuremath'. Our findings provide a platform for designing dissipationless electronics and valleytronics in a more robust manner through the tuning of the magnetization orientation.