We study the tunneling tail of eigenfunctions of the quantum map using arbitrary precision arithmetic and find that nonmonotonic decaying tails accompanied by step structures appear even when the corresponding classical system is extremely close to the integrable limit. Using the integrable basis constructed with the Baker-Campbell-Hausdorff (BCH) formula, we clarify that the observed structure emerges due to the coupling with excited states via the quantum resonance mechanism. Further calculations reveal that the step structure gives stretched exponential decay as a function of the inverse Planck constant, which is not expected to appear in normal tunneling processes.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1103/PhysRevE.106.064205 | DOI Listing |
Nano Lett
March 2025
Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506, United States.
Crystal defects, whether intrinsic or engineered, drive many fundamental phenomena and novel functionalities of quantum materials. Here, we report symmetry-breaking phenomena induced by Sn vacancy defects on the surface of epitaxial Kagome antiferromagnetic FeSn films using low-temperature scanning tunneling microscopy and spectroscopy. Near the single Sn vacancy, anisotropic quasiparticle interference patterns are observed in the differential conductance d/d maps, breaking the 6-fold rotational symmetry of the Kagome layer.
View Article and Find Full Text PDFJ Phys Chem Lett
March 2025
Department of Physics, National Institute of Technology, Durgapur, West Bengal 713209, India.
Molybdenum dichalcogenides are remarkable two-dimensional materials with promising applications in electronics, optoelectronics, and energy storage. Modifying a synthesized MoTe layer by embedding extra metal atoms into lattice voids induces novel electronic and magnetic properties, enabling quantum phenomena. Our density functional theory (DFT) calculations explore post-growth Fe deposition in 2H- and 1T'-MoTe phases, evaluating adatom, interstitial (Int), and substitutional (Sub) configurations.
View Article and Find Full Text PDFNat Commun
March 2025
Nexus for Quantum Technologies, Department of Physics, University of Ottawa, Ottawa, ON, Canada.
Tunnel ionization, the fundamental process in strong field physics and attosecond science, along with the subsequent electron dynamics are typically governed by the polarization and carrier envelope phase of the incident laser pulse. Moreover, most light-matter interactions involve Gaussian beams and rely primarily on dipole-active transitions. In this article, we reveal that Orbital Angular Momentum (OAM) carrying beams enable to control tunnel ionization in atoms and molecules.
View Article and Find Full Text PDFACS Nano
March 2025
Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.
Resonant tunneling, with energy and momentum conservation, has been extensively studied in two-dimensional van der Waals heterostructures and has potential applications in band structure probing, multivalued logic, and oscillators. Lattice alignment is crucial in resonant tunneling transistors (RTTs) for achieving negative differential resistance (NDR) with a high peak-to-valley ratio (PVR) because twist-angle-induced momentum mismatch can break the resonant tunneling condition. Here, we report anisotropic resonant tunneling in twist-stacked ReSe/-BN/ReSe RTTs, where the PVR exhibits a strong dependence on the twist angle between the two ReSe layers, reaching a maximum at the twist angle of 102°.
View Article and Find Full Text PDFNatl Sci Rev
April 2025
Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), TD Lee Institute, Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
The combination of open-shell nanographenes (NGs) and magnetic transition metals holds great promise for generating various new quantum phases applicable in spintronics and quantum information technologies. However, a crucial aspect in accomplishing this is to comprehend the magnetic exchange interactions between unpaired π- and d-electrons, a topic that has been seldom addressed. In this study, we focus on magnetic π-d exchange interactions between open-shell NGs and a magnetic coordination center of Fe or Co by employing scanning tunneling microscopy and spectroscopy.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!