Tootfinder

Weyl semimetal engineering by symmetry control in NiTe$_2$
Marcos G. O. Junior, Augusto L. Ara\'ujo, Emmanuel V. C. Lopes, Tome M. Schmidt
https://arxiv.org/abs/2506.13908

Weyl semimetal engineering by symmetry control in NiTe$_2$
In this work, we investigate the emergence of Weyl points in an inversion symmetry-breaking 1T-NiTe$_2$ system. Through first-principles calculations based on the density functional theory combined with tight-binding methods, distinct number of Weyl crossings arise under an appropriate symmetry breaking. We identify three sets of Weyl points by breaking the inversion symmetry in NiTe$_2$, resulting in a total of 28 Weyl crossings. The first set comes from the Dirac semimetal, whereas the other …

Shaping Bulk Fermi Arcs in the Momentum Space of Photonic Crystal Slabs
Luigi Frau, Simone Zanotti, Lydie Ferrier, Dario Gerace, Hai Son Nguyen
https://arxiv.org/abs/2506.13698

Shaping Bulk Fermi Arcs in the Momentum Space of Photonic Crystal Slabs
Exceptional points (EPs) are special spectral degeneracies of non-Hermitian operators: at the EP, the complex eigenvalues coalesce, i.e., they become degenerate in both their real and imaginary parts. In two-dimensional (2D) photonic crystal lattices, these elements can be tailored through structural engineering. In particular, it is known that a quadratic degeneracy in the photonic band structure can be split into a pair of Dirac points (DPs) by breaking one of the unit cell symmetries, and ea…

This https://arxiv.org/abs/2503.17838 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Analysis of pitchfork bifurcations and symmetry breaking in the elliptic restricted three-body problem
A unified framework is proposed to quantitatively characterize pitchfork bifurcations and associated symmetry breaking in the elliptic restricted three-body problem (ERTBP). It is known that planar/vertical Lyapunov orbits and Lissajous orbits near the collinear libration points undergo pitchfork bifurcations with varying orbital energy. These bifurcations induce symmetry breaking, generating bifurcated families including halo/quasi-halo orbits, axial/quasi-axial orbits, and their corresponding…

This https://arxiv.org/abs/2412.15104 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Symmetry breaking effects in pion couplings to constituent quark currents
Pseudoscalar and axial neutral and charged pion-constituent quark coupling constants are investigated with nondegenerate quark masses in different kinematical points, off shell and on shell pions and constituent quarks. By considering a large quark mass expansion of a quark determinant in the presence of local pion field and of constituent quark background currents, gluonic effects are considered by means of an effective gluon propagator that dresses quark currents. For the neutral pion, mixing…

This https://arxiv.org/abs/2502.13943 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csAI_…

AdaptiveStep: Automatically Dividing Reasoning Step through Model Confidence
Current approaches for training Process Reward Models (PRMs) often involve breaking down responses into multiple reasoning steps using rule-based techniques, such as using predefined placeholder tokens or setting the reasoning step's length into a fixed size. These approaches overlook the fact that specific words do not typically mark true decision points in a text. To address this, we propose AdaptiveStep, a method that divides reasoning steps based on the model's confidence in predicting the …

Envelopes of lines, unfoldings and breaking symmetry
Peter Giblin, Alexander Wettig
https://arxiv.org/abs/2506.16547 https://arxiv.or…

Envelopes of lines, unfoldings and breaking symmetry
We generalise the well-known ``embroidery'' envelopes of chords joining points at angles $t$ and $mt$ of a single circle in several ways. Firstly we allow $m$ to be rational (possibly negative) instead of integral, finding formulas for the number of cusps, points at infinity and self-intersections of these envelopes. Secondly we use two concentric circles instead of one, taking the chords to join a point of one circle to a point of the other. This construction allows the formation of different …

Kekul\'e order from diffuse nesting near higher-order Van Hove points
Jonas Beck, Jonathan Bodky, Matteo D\"urrnagel, Ronny Thomale, Julian Ingham, Lennart Klebl, Hendrik Hohmann
https://arxiv.org/abs/2505.22725

Kekulé order from diffuse nesting near higher-order Van Hove points
Translation symmetry-breaking order is assumed to be suppressed by the lack of Fermi surface nesting near certain higher-order Van Hove singularities (HOVHS). We show the anisotropic band-flattening inherent to such HOVHS, combined with broadening of the Fermi surface due to elevated critical temperatures, results in the Fermi surface becoming approximately nested at a wavevector unrelated to the precise shape of the Fermi surface - leading to a $\sqrt{3}\times\sqrt{3}$ Kekulé density wave for…

A model for baryon production in spin-dependent string fragmentation
Albi Kerbizi, Xavier Artru
https://arxiv.org/abs/2507.06810 https://

A model for baryon production in spin-dependent string fragmentation
We introduce spin-1/2 baryons in the string+${}^3P_0$ model of hadronization, previously restricted to the production of pseudoscalar and vector mesons. Baryons are modeled as quark-diquark bound states and baryon production is described by the tunneling of diquark-antidiquark pairs at string breaking points. Diquarks can be scalar or pseudovector, the latter being produced in the relative ${}^5D_0$ state. Introducing the quark-baryon-diquark coupling, the relevant splitting amplitudes for the …

From trigonal to triclinic: Symmetry-tuned Rashba effects in buckled honeycomb SrHfO$_{3}$-based heterostructures
Okan K\"oksal
https://arxiv.org/abs/2508.01967 https://

From trigonal to triclinic: Symmetry-tuned Rashba effects in buckled honeycomb SrHfO$_{3}$-based heterostructures
Harnessing the interplay of symmetry breaking and spin-orbit coupling, we investigate Rashba spin splitting in buckled honeycomb (SrHfO$_3$)$_2$/(LaAlO$_3$)$_4$(111) superlattices using density functional theory (DFT) calculations with a Hubbard $U$ term and a Wannier-based tight-binding (TB) model. In the non-centrosymmetric $P1$ phase, pronounced Rashba-type splitting emerges near the $M$ and $K$ points accompanied by a helical in-plane spin texture, while the centrosymmetric $P321$ phase rem…