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Spin-orbit proximity in MoS/bilayer graphene heterostructures.
Nat Commun
October 2024
Solid State Physics Laboratory, ETH Zürich, 8093, Zürich, Switzerland.
Article Synopsis
- Van der Waals heterostructures allow for the customization of electronic properties by combining two-dimensional materials, particularly bilayer graphene and transition metal dichalcogenides (TMDs).
- The study confirms two types of spin-orbit coupling (SOC) in bilayer graphene when in contact with molybdenum disulfide: Ising and Rashba coupling, with respective energy values of 1.55 meV and 2.5 meV.
- Observations include a unique pattern in conductivity as the electric displacement field changes, attributed to Ising SOC-induced gaps, and noticeable spikes in magnetoconductivity that challenge current theoretical understandings.
Weak antilocalization in the topological semimetal candidate YbAuSb.
J Phys Condens Matter
September 2024
Department of Physics, Indian Institute of Technology, Kanpur 208016, India.
We report a study of the magnetic and magnetotransport properties of YbAuSb single crystals, which were grown using the bismuth flux. The x-ray diffraction data indicate that YbAuSb crystallizes in LiGaGe-type hexagonal structure with space group6. Our magnetic measurements revealed that YbAuSb is nonmagnetic with a divalent state of ytterbium ion.
View Article and Find Full Text PDFInterplay of structural chirality, electron spin and topological orbital in chiral molecular spin valves.
Nat Commun
August 2023
Department of Physics, Florida State University, Tallahassee, FL, 32306, USA.
Article Synopsis
- Chirality is crucial in various scientific fields and has been linked to spin polarization of electrons when they pass through chiral materials, a phenomenon known as chirality-induced spin selectivity (CISS).
- This study investigates how chiral structures influence electronic spin by comparing magnetoconductance in spin valves using magnetic semiconductors with different types of metal electrodes.
- Findings indicate that the spin-orbit coupling (SOC) in the metal electrode plays a significant role in converting orbital polarization from chiral molecules into spin polarization, providing insights into CISS effects.
Robust Weak Antilocalization Effect Up to ∼120 K in the van der Waals Crystal FeGeTe with Near-Room-Temperature Ferromagnetism.
J Phys Chem Lett
June 2023
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
The van der Waals FeGeTe is a 3d ferromagnetic metal with a high Curie temperature of 275 K. We report herein the observation of an exceptional weak antilocalization (WAL) effect that can persist up to 120 K in an FeGeTe nanoflake, indicating the dual nature with both itinerant and localized magnetism of 3d electrons. The WAL behavior is characterized by the magnetoconductance peak around zero magnetic field and is supported by the calculated localized nondispersive flat band around the Fermi level.
View Article and Find Full Text PDFFermi-Arc Metals.
Phys Rev Lett
May 2023
Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany.
We predict a novel metallic state of matter that emerges in a Weyl-semimetal superstructure with spatially varying Weyl-node positions. In the new state, the Weyl nodes are stretched into extended, anisotropic Fermi surfaces, which can be understood as being built from Fermi arclike states. This "Fermi-arc metal" exhibits the chiral anomaly of the parental Weyl semimetal.
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