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α,ω-Alkanedibromides Form Low Conductance Chemisorbed Junctions with Silver Electrodes.
J Am Chem Soc
October 2024
Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.
Chemical groups capable of connecting molecules physically and electrically between electrodes are of critical importance in molecular-scale electronics, influencing junction conductance, variability, and function. While the development of such linkage chemistries has focused on interactions at gold, the distinct reactivity and electronic structure of other electrode metals provides underexplored opportunities to characterize and exploit new binding motifs. In this work we show that α,ω-alkanedibromides spontaneously form well-defined junctions using silver, but not gold, electrodes through application of the glovebox-based scanning tunneling microscope-based break junction method.
View Article and Find Full Text PDFUltra-low-noise transimpedance amplifier with a single HEMT in pre-amplifier for measuring shot noise in cryogenic STM.
Ultramicroscopy
December 2024
Beijing Academy of Quantum Information Sciences, Haidian 100193, Beijing, China; Coll Phys & Elect Engn, Anyang Normal University, Anyang, 455000, Henan, China. Electronic address:
In this work, a design of transimpedance amplifier (TIA) for cryogenic scanning tunneling microscope (CryoSTM) is proposed. TIA with the tip-sample component in CryoSTM is called as CryoSTM-TIA. With transimpedance gain of 1 GΩ, the bandwidth of the CryoSTM-TIA is larger than 200 kHz.
View Article and Find Full Text PDFEvidence of a distinct collective mode in Kagome superconductors.
Nat Commun
July 2024
Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, PR China.
Article Synopsis
- The study explores collective modes within superconductors, specifically in the non-magnetic kagome material CsVTaSb, highlighting the unique behaviors of Cooper pairs.
- The researchers utilize scanning tunneling microscopy to identify a collective mode characterized by both isotropic and anisotropic superconducting gaps, along with an associated bosonic mode that arises from electron interactions.
- As the concentration of the material changes, the gaps converge and eventually shift to a state of equal amplitude before increasing, while the collective mode energy decreases significantly, remaining stable even when charge density wave order diminishes.
Conductance Quantization in 2D Semi-Metallic Transition Metal Dichalcogenides.
Small
September 2024
State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering & Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China.
Conductance quantization of 2D materials is significant for understanding the charge transport at the atomic scale, which provides a platform to manipulate the quantum states, showing promising applications for nanoelectronics and memristors. However, the conventional methods for investigating conductance quantization are only applicable to materials consisting of one element, such as metal and graphene. The experimental observation of conductance quantization in transition metal dichalcogenides (TMDCs) with complex compositions and structures remains a challenge.
View Article and Find Full Text PDFDesigner artificial chiral kagome lattice with tunable flat bands and topological boundary states.
Nanotechnology
January 2024
Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
The kagome lattice is a well-known model system for the investigation of strong correlation and topological electronic phenomena due to the intrinsic flat band, magnetic frustration, etc. Introducing chirality into the kagome lattice would bring about new physics due to the unique symmetry, which is still yet to be fully explored. Here we report the investigation on a two-dimensional chiral kagome lattice utilizing tight binding band calculation and topological index analysis.
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