Including the previously ignored dispersion of phonons we revisit the metal-insulator transition problem in one-dimensional electron-phonon systems on the basis of a modified spinless fermion Holstein model. Using matrix-product-state techniques we determine the global ground-state phase diagram in the thermodynamic limit for the half-filled band case, and show that in particular the curvature of the bare phonon band has a significant effect, not only on the transport properties characterized by the conductance and the Luttinger liquid parameter, but also on the phase space structure of the model as a whole. While a downward curved (convex) dispersion of the phonons only shifts the Tomonaga-Luttinger-liquid to charge-density-wave quantum phase transition towards stronger EP coupling, an upward curved (concave) phonon band leads to a new phase-separated state which, in the case of strong dispersion, can even completely cover the charge-density wave. Such phase separation does not occur in the related Edwards fermion-boson model.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11300790 | PMC |
| http://dx.doi.org/10.1038/s41598-024-68811-y | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Artificial Photothermal Nociceptor Using Mott Oscillators.
Adv Sci (Weinh)
December 2024
Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Bioinspired sensory systems based on spike neural networks have received considerable attention in resolving high energy consumption and limited bandwidth in current sensory systems. To efficiently produce spike signals upon exposure to external stimuli, compact neuron devices are required for signal detection and their encoding into spikes in a single device. Herein, it is demonstrated that Mott oscillative spike neurons can integrate sensing and ceaseless spike generation in a compact form, which emulates the process of evoking photothermal sensing in the features of biological photothermal nociceptors.
View Article and Find Full Text PDFStudy on the piezoresistivity of Cr-doped VO thin film for MEMS sensor applications.
Microsyst Nanoeng
December 2024
Micro- and Nanosystems, Department of Electrical Engineering, KU Leuven, Kasteelpark Arenberg 10, 3001, Leuven, Belgium.
Cr-doped VO thin film shows a huge resistivity change with controlled epitaxial strain at room temperature as a result of a gradual Mott metal-insulator phase transition with strain. This novel piezoresistive transduction principle makes Cr-doped VO thin film an appealing piezoresistive material. To investigate the piezoresistivity of Cr-doped VO thin film for implementation in MEMS sensor applications, the resistance change of differently orientated Cr-doped VO thin film piezoresistors with external strain change was measured.
View Article and Find Full Text PDFShot Noise in a Metal Close to the Mott Transition.
Nano Lett
December 2024
Department of Physics, Emory University, Atlanta, Georgia 30322, United States.
SrIrO is a metallic complex oxide with unusual electronic and magnetic properties believed to originate from electron correlations due to its proximity to the Mott metal-insulator transition. However, the nature of its electronic state and the mechanism of metallic conduction remain poorly understood. We demonstrate that the shot noise produced by nanoscale SrIrO junctions is strongly suppressed, inconsistent with diffusive quasiparticle transport.
View Article and Find Full Text PDFFlat band fine-tuning and its photonic applications.
Nanophotonics
September 2024
Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), 34126, Daejeon, Republic of Korea.
Article Synopsis
- Flat bands in tight-binding lattices are unique energy bands that can exhibit macroscopic degeneracies and respond interestingly to changes, making them candidates for exotic physical phases.
- The review explores methods to create these flat band networks, focusing on symmetry and precise adjustments, and how these methods can handle perturbations in single-particle and many-body contexts.
- Notable discoveries from this strategy include non-perturbative metal-insulator transitions and fractal phases, with potential applications in designing advanced nanophotonic systems like photonic crystals and metasurfaces.
Dynamic control of the directional scattering of single Mie particle by laser induced metal insulator transitions.
Nanophotonics
August 2024
Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China.
Interference between the electric and magnetic dipole-induced in Mie nanostructures has been widely demonstrated to tailor the scattering field, which was commonly used in optical nano-antennas, filters, and routers. The dynamic control of scattering fields based on dielectric nanostructures is interesting for fundamental research and important for practical applications. Here, it is shown theoretically that the amplitude of the electric and magnetic dipoles induced in a vanadium dioxide nanosphere can be manipulated by using laser-induced metal-insulator transitions, and it is experimentally demonstrated that the directional scattering can be controlled by simply varying the irradiances of the excitation laser.
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!