https://flatland-pi.vercel.app/materials/bi4br4.html The newest items tagged Bi₄Br₄ in the Flatland news feed. en Mon, 05 Oct 2026 08:10:53 GMT https://arxiv.org/abs/2605.24153v1 https://arxiv.org/abs/2605.24153v1 Fri, 22 May 2026 19:21:09 GMT arXiv: Charge density wave (CDW) implies a periodic modulation of the charge density. Typically observed in metallic systems, CDWs arise from Fermi surface instabilities, resulting in the total or partial gapping of the Fermi surface. Here, we present experimental evidence for a CDW state emerging in a band insulator which… Theory Experiment Bi₄Br₄ https://arxiv.org/abs/2604.23969v1 https://arxiv.org/abs/2604.23969v1 Mon, 27 Apr 2026 02:30:13 GMT arXiv: Three-dimensional (3D) topological ferroelectric (FE) insulators, in which topological and FE orders naturally coexist, enable field-controlled spintronic devices. In this work, we predict a new structure of bismuth monohalides Bi4Br4 and Bi4I4, denoted γ phase, and demonstrate that it is an ideal 3D topological FE… Theory Bi₄Br₄ https://arxiv.org/abs/2604.23969v1 https://arxiv.org/abs/2604.23969v1 Mon, 27 Apr 2026 02:30:13 GMT arXiv: Three-dimensional (3D) topological ferroelectric (FE) insulators, in which topological and FE orders naturally coexist, enable field-controlled spintronic devices. In this work, we predict a new structure of bismuth monohalides Bi4Br4 and Bi4I4, denoted γ phase, and demonstrate that it is an ideal 3D topological FE… Theory Bi₄Br₄ https://arxiv.org/abs/2603.29189v1 https://arxiv.org/abs/2603.29189v1 Tue, 31 Mar 2026 02:54:15 GMT arXiv: The quasi-one-dimensional material Bi4I4 hosts two crystallographically similar polymorphs that realize distinct topological insulating phases separated by a first-order structural transition near room temperature. This transition occurs without a change in space group, arising instead from a subtle rearrangement of… Theory Experiment Bi₄Br₄ https://arxiv.org/abs/2602.09660v1 https://arxiv.org/abs/2602.09660v1 Tue, 10 Feb 2026 11:10:58 GMT arXiv: Topological insulators host exotic quantum phenomena such as the quantum spin Hall (QSH) effect, which enables dissipationless one-dimensional edge conduction. Realizing such states at room temperature and on a macroscopic scale is essential for energy-efficient electronics and quantum technologies, yet remains a… Theory Experiment Bi₄Br₄