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Vanishing Altermagnetism and Emergent Ferromagnetism at the Two-Dimensional Limit of CrSb
Yunlong Liu, Zixuan Wu, Qinxi Liu +8
Altermagnets offer a promising route to spintronic devices by combining spin-split electronic states with zero net magnetization, but how reduced dimensionality reshapes their magn…
Chiral charge density wave and backscattering-immune orbital texture in monolayer 1T-TiTe2
Mingqiang Ren, Fangjun Cheng, Yufei Zhao +7
Non-trivial electronic states are attracting intense attention in low-dimensional physics. Though chirality has been identified in charge states with a scalar order parameter, its…
Honeycomb lattice in metal-rich chalcogenide Fe2Te
Jia-Qi Guan, Li Wang, Pengdong Wang +7
Two-dimensional honeycomb crystals have inspired intense research interest for their novel properties and great potential in electronics and optoelectronics. Here, through molecula…
Charge density waves and Fermi level pinning in monolayer and bilayer SnSe
Shu-Ze Wang, Yi-Min Zhang, Jia-Qi Fan +4
Materials with reduced dimensionality often exhibit exceptional properties that are different from their bulk counterparts. Here we report the emergence of a commensurate 2 $\times…
Semiconductor-metal phase transition and emergent charge density waves in 1T-ZrX (X = Se, Te) at the two-dimensional limit
Ming-Qiang Ren, Sha Han, Jia-Qi Fan +7
Charge density wave (CDW) is a collective quantum phenomenon in metals and features a wave-like modulation of the conduction electron density. A microscopic understanding and exper…
Experimental realization of an intrinsic magnetic topological insulator
Yan Gong, Jingwen Guo, Jiaheng Li +21
Intrinsic magnetic topological insulator (TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can p…
Realizing an Epitaxial Stanene with an Insulating Bandgap
Yunyi Zang, Tian Jiang, Yan Gong +12
Stanene, a single atomic layer of Sn in a honeycomb lattice, is predicted a candidate wide bandgap two-dimensional (2D) topological insulator and can host intriguing topological st…
Spin-Polarized Quantum Well States on BiFeSe
Michael M. Yee, Z. -H. Zhu, Anjan Soumyanarayanan +8
Low temperature scanning tunneling microscopy is used to image the doped topological insulator BiFeSe. Interstitial Fe defects allow the detection of quasiparticle…
Molecular beam epitaxy growth and scanning tunneling microscopy study of TiSe ultrathin films
Jun-Ping Peng, Jia-Qi Guan, Hui-Min Zhang +5
Molecular beam epitaxy is used to grow TiSe2 ultrathin films on graphitized SiC(0001) substrate. TiSe2films proceed via a nearly layer-by-layer growth mode and exhibit two dominant…
Mass acquisition of Dirac fermions in Cr-doped topological insulator Sb2Te3 films
Yeping Jiang, Zhi Li, Canli Song +7
We introduce time-reversal-symmetry breaking by doping Cr atoms into the topmost quintuple layer or into the bulk of Sb2Te3 thin films. We find that even at a high Cr-doping level…
Landau quantization and the thickness limit of topological insulator thin films of Sb2Te3
Yeping Jiang, Yilin Wang, Mu Chen +7
We report the experimental observation of Landau quantization of molecular beam epitaxy grown Sb2Te3 thin films by a low-temperature scanning tunneling microscope. Different from a…
Fermi Level Tuning of Epitaxial Sb2Te3 Thin Films on Graphene by Regulating Intrinsic Defects and Substrate Transfer Doping
Yeping Jiang, Y. Y. Sun, Mu Chen +9
High-quality Sb2Te3 films are obtained by molecular beam epitaxy on graphene substrate and investigated by in situ scanning tunneling microscopy/spectroscopy. Intrinsic defects res…
Crossover of Three-Dimensional Topological Insulator of Bi2Se3 to the Two-Dimensional Limit
Yi Zhang, Ke He, Cui-Zu Chang +13
Bi2Se3 is theoretically predicted1 2and experimentally observed2,3 to be a three dimensional topological insulator. For possible applications, it is important to understand the ele…