We have experimentally investigated the effect of electron temperature on transport in the two-dimensional Dirac surface states of the three-dimensional topological insulator HgTe. We have found that around the minimal conductivity point, where both electrons and holes are present, heating the carriers with a DC current results in a nonmonotonic differential resistance of narrow channels. We have shown that the observed initial increase in resistance can be attributed to electron-hole scattering, while the decrease follows naturally from the change in Fermi energy of the charge carriers. Both effects are governed dominantly by a van Hove singularity in the bulk valence band. The results demonstrate the importance of interband electron-hole scattering in the transport properties of topological insulators.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.nanolett.1c01271 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Collective excitations and low-energy ionization signatures of relativistic particles in silicon detectors.
Commun Phys
December 2024
C. N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, NY 11794 USA.
Solid-state detectors with a low energy threshold have several applications, including searches of non-relativistic halo dark-matter particles with sub-GeV masses. When searching for relativistic, beyond-the-Standard-Model particles with enhanced cross sections for small energy transfers, a small detector with a low energy threshold may have better sensitivity than a larger detector with a higher energy threshold. In this paper, we calculate the low-energy ionization spectrum from high-velocity particles scattering in a dielectric material.
View Article and Find Full Text PDFRoom Temperature Hydrogen Atom Scattering Experiments Are Not a Sufficient Benchmark to Validate Electronic Friction Theory.
J Phys Chem Lett
December 2024
Department of Chemistry, University of Warwick, Gibbet Hill Road, CV4 7AL Coventry, U.K.
In the dynamics of atoms and molecules at metal surfaces, electron-hole pair excitations can play a crucial role. In the case of hyperthermal hydrogen atom scattering, they lead to nonadiabatic energy loss and highly inelastic scattering. Molecular dynamics with electronic friction simulation results, based on an isotropic homogeneous electron gas approximation, have previously aligned well with measured kinetic energy loss distributions, indicating that this level of theoretical description is sufficient to describe nonadiabatic effects during scattering.
View Article and Find Full Text PDFEfficient Light to Heat Conversion in SbSe Nanorods and the Role of Macro-channel Imprinted SbSe Loaded Hybrid Membrane for Superior Desalination Performance.
Small
December 2024
Thin Film and NanoScience Laboratory, Department of Physics, Jadavpur University, Kolkata, 700032, India.
Article Synopsis
- The report highlights the efficiency of SbSe nanorods (NRs) in converting light to heat for solar thermal applications, achieving around 57.8% efficiency with specific lasers and heating hybrid membranes to ≈59°C in just 15 minutes.* -
- Despite their advantages, SbSe NRs have a limited evaporation rate due to hydrophobicity, which restricts water movement to the heated areas, leading to less effective solar evaporation.* -
- A new macro-channel imprinting technique improves water transport in these hybrid membranes, boosting evaporation efficiency to ≈148% under strong lighting and achieving effective heavy metal removal from water, meeting WHO standards for safe drinking water.*
Photoactivity Enhancement of WO Photoanodes Using the Combined Effect of Plasmonic Au and Photoluminescent YO:Eu Nanoparticles.
ACS Omega
November 2024
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Astana 010000, Kazakhstan.
The WO photoanode has great potential application for solar photoelectrochemical water oxidation due to suitable band edge positions with water oxidation potentials. However, it suffers from poor light absorbance in the visible region. Here, we use Eu-doped YO nanoparticles (NPs) in combination with plasmonic gold (Au) NPs to better utilize and adsorb photons from UV and visible regions of sunlight.
View Article and Find Full Text PDFChemical synthesis, characterization, and anticancer potential of CuO/ZrO/TiO/RGO nanocomposites against human breast (MCF-7) cancer cells.
RSC Adv
November 2024
King Abdullah Institute for Nanotechnology, King Saud University Riyadh 11451 Saudi Arabia.
Nanocomposites (NCs) have attractive potential applications in gas-sensing, energy, photocatalysis, and biomedicine. In the present work, the fabrication of CuO/ZrO/TiO/RGO nanocomposites (NCs) was done a simple chemical route. Our aim in this work was to synthesis and investigate the selective anticancer activity of TiO NPs by supporting CuO, ZrO, and RGO toward cancer and normal cells.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!