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Direct observation of chiral edge current at zero magnetic field in a magnetic topological insulator.
Nat Commun
January 2025
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
The chiral edge current is the boundary manifestation of the Chern number of a quantum anomalous Hall (QAH) insulator. The van der Waals antiferromagnet MnBiTe is theorized to be a QAH in odd-layers but has shown Hall resistivity below the quantization value at zero magnetic field. Here, we perform scanning superconducting quantum interference device (sSQUID) microscopy on these seemingly failed QAH insulators to image their current distribution.
View Article and Find Full Text PDFNonmonotonic Hall Effect of Weyl Semimetals under a Magnetic Field.
Phys Rev Lett
October 2024
RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.
The Hall effect of topological quantum materials often reveals essential new physics and possesses potential for application. The magnetic Weyl semimetal is one especially interesting example that hosts an interplay between the spontaneous time-reversal symmetry-breaking topology and the external magnetic field. However, it is less known beyond the anomalous Hall effect thereof, which is unable to account for plenty of magnetotransport measurements.
View Article and Find Full Text PDFSelf-Adaptive Magnetic Liquid Metal Microrobots Capable of Crossing Biological Barriers and Wireless Neuromodulation.
ACS Nano
October 2024
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Magnetic liquid-bodied microrobots (MRs) possess nearly infinite shape adaptivity. However, they currently confront the risk of structure instability/crushes during shape-morphing in tiny biological environments. This article reports that magnetic liquid metal (LM) MRs (LMMRs) show high structure stability and robust magnetic maneuverability.
View Article and Find Full Text PDFUnusual low-temperature behavior in the half-filled band of the one-dimensional extended Hubbard model in atomic limit.
Phys Rev E
August 2024
Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, Svientsitskii Street 1, 79011 L'viv, Ukraine.
Recently, a kind of finite-temperature pseudotransition was observed in several quasi-one-dimensional models. In this work, we consider a genuine one-dimensional extended Hubbard model in the atomic limit, influenced by an external magnetic field and with the arbitrary number of particles controlled by the chemical potential. The one-dimensional extended Hubbard model in the atomic limit was initially studied in the seventies and has been investigated over the past decades, but it still surprises us today with its fascinating properties.
View Article and Find Full Text PDFYu-Shiba-Rusinov States in -Wave Kagome Superconductors: Self-Consistent Bogoliubov-de Gennes Calculations.
J Phys Chem Lett
September 2024
Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, Department of Physics, Zhejiang Sci-Tech University, 310018 Hangzhou, China.
Article Synopsis
- - Recent research into Yu-Shiba-Rusinov (YSR) states in kagome superconductors highlights the need for a deeper understanding of how local superconductivity interacts with magnetic impurities and how this varies with the strength of their interactions.
- - This study employs a numerical approach using Bogoliubov-de Gennes equations to analyze an -wave superconducting kagome model affected by a single magnetic impurity, finding that the local pair potential decreases near the impurity as interaction strength increases.
- - The research identifies a first-order phase transition at high interaction strengths, resulting in stable and metastable states, and indicates that the properties of this transition depend significantly on the chemical potential in the kagome energy spectrum.
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