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Ferroelectric switching of quantum anomalous Hall effects in MnBi2Te4 films
Jiaheng Li, Quansheng Wu, Hongming Weng
https://arxiv.org/abs/2506.07653 https:…

Ferroelectric switching of quantum anomalous Hall effects in MnBi2Te4 films
The integration of ferroelectric and topological materials offers a promising avenue for advancing the development of quantum material devices. In this work, we explore the strong coupling between topological states and ferroelectricity in the heterostructure formed by interfacing MnBi2Te4 (MBT) thin films and monolayer In2Te3. Our first-principles calculations demonstrate that the polarization direction in In2Te3 can strongly alter electronic band structures in the MBT/In2Te3 heterostructure, …

Bose-Hubbard Model on a Honeycomb Superlattice: Quantum Phase Transitions and Lattice Effects
Wei-Wei Wang, Jin Yang, Jian-Ping Lv, Chao Zhang
https://arxiv.org/abs/2506.06984

Bose-Hubbard Model on a Honeycomb Superlattice: Quantum Phase Transitions and Lattice Effects
We investigate the ground-state and finite-temperature phase diagrams of the Bose-Hubbard model on a honeycomb superlattice. The interplay between the superlattice potential depth $Δ/t$ and the onsite interaction $U/t$ gives rise to three distinct quantum phases at zero temperature: a superfluid phase, a Mott insulator I phase with unit filling on each site, and a Mott insulator II phase characterized by density imbalance-double occupancy on one sublattice and vacancy on the other at unit fill…

Effective normalization of sub-Riemannian connections
Erlend Grong, Jan Slovak
https://arxiv.org/abs/2508.00108 https://arxiv.org/pdf/2508.00108

Effective normalization of sub-Riemannian connections
We give a new normalization condition for connections on sub-Riemannian manifolds with constant symbols. The condition is formulated in terms of Cartan connections and depends only on the first degree of homogeneity of the curvature. The essential part of our result is to show how a Cartan connection can be uniquely determined by a partial connection on the horizontal bundle. Viewed from the manifold, this observation is equivalent to the following claim: a compatible partial affine connection …

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Effect of Berry connection on attosecond transient absorption spectroscopy in gapped graphene
Jiayu Yan, Hongxuan Er, Wei Dang, Jiahuan Ren, Chao Chen, Dianxiang Ren, Fulong Dong
https://arxiv.org/abs/2506.19286

Effect of Berry connection on attosecond transient absorption spectroscopy in gapped graphene
We investigated the attosecond transient absorption spectroscopy (ATAS) in gapped graphene by numerically solving the four-band density-matrix equations. Our results reveal that, in contrast to graphene whose fishbone-shaped spectra primarily oscillates at twice the frequency of the pump laser, the ATAS of gapped graphene exhibits a first-order harmonic component induced by the Berry connection. To gain insight into this interesting results, we employ a simplified model that considers only the …

This https://arxiv.org/abs/2502.18262 has been replaced.
initial toot: https://mastoxiv.page/@a…

Analytic approach to creating homogeneous fields with finite-size magnets
Homogeneous magnetic fields can be generated through the strategic arrangement of permanent magnets. The Halbach array serves as a prominent example of an effective design following this principle. However, it is a two-dimensional approach because it is optimal when placing infinitely long magnets -- line dipoles -- on a circle. If shorter, more realistic magnets are to be used, the optimal arrangement of magnetic moments diverges from the classical Halbach geometry. This paper presents optimal…

Fronts and patterns with a dynamic parameter ramp
Montie Avery, Odalys Garcia-Lopez, Ryan Goh, Benjamin Hosek, Ethan Shade
https://arxiv.org/abs/2506.12142

Fronts and patterns with a dynamic parameter ramp
We examine the effect of a slowly-varying time-dependent parameter on invasion fronts for which an unstable homogeneous equilibrium is invaded by either another homogeneous state or a spatially periodic state. We first explain and motivate our approach by studying asymptotically constant invasion fronts in a scalar FKPP equation with time-dependent parameter which controls the stability of the trivial state. Following recent works in the area, we use a linearized analysis to derive formal predi…