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Particle exchange statistics beyond fermions and bosons.
Nature
January 2025
Department of Physics and Astronomy, Rice University, Houston, TX, USA.
Article Synopsis
- There are generally two known types of particle statistics in quantum mechanics: fermions and bosons, along with a rare exception called anyons in two dimensions.
- The concept of parastatistics, previously thought to be equivalent to fermions and bosons, is now shown to allow for unique particle types that follow distinct exclusion principles.
- This research introduces a new theory involving these "paraparticles," leading to the discovery of new quasiparticle behaviors in quantum spin models, potentially paving the way for new elementary particle categories in physics.
Direct Observation of Anisotropic Coulomb Interaction in a Topological Nodal Line Semimetal.
Adv Sci (Weinh)
January 2025
Department of Physics, Chung-Ang University, Seoul, 06974, Republic of Korea.
The fundamental characteristics of collective interactions in topological band structures can be revealed by the exploration of charge screening in topological materials. In particular, distinct anisotropic screening behaviors are predicted to occur in Dirac nodal line semimetals (DNLSMs) due to their peculiar anisotropic low-energy dispersion. Despite the recent extensive theoretical research, experimental observations of exotic charge screening in DNLSMs remain elusive, which is partly attributed to the coexisting trivial bands near the Fermi energy.
View Article and Find Full Text PDFSupercarbon assembly inspired two-dimensional hourglass fermion.
J Chem Phys
January 2025
MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China.
By using a tight-binding model, first-principles calculations, and ab initio molecular dynamics simulations, we theoretically demonstrate that the C76-Td-assembled two-dimensional (2D) honeycomb lattice is stable at room temperature and is resistant to mechanical deformation. We disclose that each C76-Td mimics a single carbon atom (geometrically and electronically); hence, it plays the role of one supercarbon. This inspires that the 2D material exhibits an exotic hourglass-like fermion at the Fermi level.
View Article and Find Full Text PDFCorrelated Dirac Fermions in Twisted Bilayers of MoS.
Nano Lett
January 2025
Beijing Computational Science Research Center, Beijing 100193, China.
Artificial honeycomb lattices are essential for understanding exotic quantum phenomena arising from the interplay between Dirac physics and electron correlation. This work shows that the top two moiré valence bands in rhombohedral-stacked twisted MoS bilayers (tb-MoS) form a honeycomb lattice with massless Dirac fermions. The hopping and Coulomb interaction parameters are explicitly determined based on large-scale ab initio calculations.
View Article and Find Full Text PDFEpitaxial Stabilization of a Pyrochlore Interface between Weyl Semimetal and Spin Ice.
Nano Lett
January 2025
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, United States.
Pyrochlore materials are known for their exotic magnetic and topological phases arising from complex interactions among electron correlations, band topology, and geometric frustration. Interfaces between different pyrochlore crystals characterized by complex many-body ground states hold immense potential for novel interfacial phenomena due to the strong interactions between these phases. However, the realization of such interfaces has been severely hindered by limitations in material synthesis methods.
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