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Direct visualization of relativistic quantum scars in graphene quantum dots.
Nature
November 2024
Department of Physics, University of California, Santa Cruz, Santa Cruz, CA, USA.
Quantum scars refer to eigenstates with enhanced probability density along unstable classical periodic orbits. First predicted 40 years ago, scars are special eigenstates that counterintuitively defy ergodicity in quantum systems whose classical counterpart is chaotic. Despite the importance and long history of scars, their direct visualization in quantum systems remains an open field.
View Article and Find Full Text PDFCorrelative Raman spectroscopy and electron microscopy identifies glycogen rich deposits correlated with local structural defects in long bones of type IV osteogenesis imperfecta patients.
J Struct Biol
December 2024
Department of Medical BioSciences, Radboudumc, 6525 GA Nijmegen, the Netherlands; Electron Microscopy Center, Radboudumc, 6525 GA Nijmegen, the Netherlands. Electronic address:
Osteogenesis imperfecta (OI) is a genetic bone disease occurring in approximately 1 in 10,000 births, usually as a result of genetic mutation. OI patients suffer from increased fracture risk and - depending on the severity of the disease - deformation of the limbs, which can even lead to perinatal death. Despite extensive studies, the way in which the genetic mutation is translated into structural and compositional anomalies of the tissue is still an open question.
View Article and Find Full Text PDFRydberg excitons in cuprous oxide: A two-particle system with classical chaos.
Chaos
October 2024
Institut für Theoretische Physik I, Universität Stuttgart, 70550 Stuttgart, Germany.
When an electron in a semiconductor gets excited to the conduction band, the missing electron can be viewed as a positively charged particle, the hole. Due to the Coulomb interaction, electrons and holes can form a hydrogen-like bound state called the exciton. For cuprous oxide, a Rydberg series up to high principle quantum numbers has been observed by Kazimierczuk et al.
View Article and Find Full Text PDFNonlinear Charge Transport and Excitable Phenomena in Semiconductor Superlattices.
Entropy (Basel)
August 2024
Gregorio Millán Institute for Fluid Dynamics, Nanoscience and Industrial Mathematics, Universidad Carlos III de Madrid, 28911 Leganés, Spain.
Semiconductor superlattices are periodic nanostructures consisting of epitaxially grown quantum wells and barriers. For thick barriers, the quantum wells are weakly coupled and the main transport mechanism is a sequential resonant tunneling of electrons between wells. We review quantum transport in these materials, and the rate equations for electron densities, currents, and the self-consistent electric potential or field.
View Article and Find Full Text PDFMagnetic Structure-Dependent Spin Texture Lattice in Hexagonal MnFeCoGe Magnets.
ACS Nano
September 2024
Anhui Provincial Key Laboratory of Magnetic Functional Materials and Devices, School of Materials Science and Engineering, Anhui University, Hefei, Anhui 230601, China.
Topological spin textures are of great significance in magnetic information storage and spintronics due to their high storage density and low drive current. In this work, the transformation of magnetic configuration from chaotic labyrinth domains to uniform stripe domains was observed in MnFeCoGe magnets. This change occurs due to the noncollinear magnetic structure switching to a uniaxial ferromagnetic structure with increasing Co content, as identified by neutron diffraction results and Lorentz transmission electron microscopy (L-TEM).
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