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Large-gap quantum anomalous Hall phase in hexagonal organometallic frameworks
摘要： The nontrivial band gap plays a critical role in quantum anomalous Hall (QAH) insulators. In this work, we propose that the intrinsic QAH phase with sizable band gaps up to 367 meV is achieved in two-dimensional hexagonal organometallic frameworks (HOMFs). Based on first-principles calculations and effective model analysis, we uncover that these large band gaps in transition metal based HOMFs are opened by strong spin-orbital coupling of the localized 4d or 5d electrons. Importantly, we reveal that Coulomb correlations can further significantly enhance the nontrivial band gaps. In addition, we suggest a possible avenue to grow these organometallic QAH insulators on a semiconducting SiC(111) substrate, and the topological features are perfectly preserved due to the van der Waals interaction. Our work shows that the correlation remarkably enhances the nontrivial band gaps, providing exotic candidates to realize the QAH states at high temperatures.
关键词： spin-orbital coupling,Coulomb correlations,hexagonal organometallic frameworks,van der Waals interaction,quantum anomalous Hall
更新于2025-09-04 15:30:14
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Entanglement and Gaussian interferometric power dynamics in an optomechanical system with radiation pressure
摘要： We investigate the non-classical correlations existing in the mixed bipartite state consisting of the reflected optical 1 mode and the mechanical mode (movable mirror). The covariance matrix is calculated when the state of each mode is initially in a vacuum. We consider the criterion of positivity of the partially transposed state (PPT criterion) to quantify the dynamical evolution of the entanglement between the reflected optical 1 and the movable mirror modes using the smallest symplectic eigenvalue. Then we use Gaussian quantum steering to measure the steerability between the two modes. We also consider the Gaussian interferometric power to quantify the quantum correlations that exist beyond entanglement.
关键词： Gaussian interferometric power,entanglement,Smallest symplectic eigenvalue,Gaussian quantum steering,PPT criterion,Non-classical correlations
更新于2025-09-04 15:30:14