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๐Ÿ” john reppy ๐Ÿ“‚ Physics
Showing 5174 results for "john reppy" in Physics
Physics Preprint PDF DOI

Accelerating finite-element-based projector augmented-wave density functional theory calculations with scalable GPU-centric computational methods

Kartick Ramakrishnan, Phani Motamarri ยท 2026

Accurate large-scale Kohn-Sham density functional theory (DFT) calculations are essential for modeling complex material systems, including interfaces, defects, nanoclusters, and twisted two-dimensionaโ€ฆ

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Physics Preprint PDF DOI

Substitutional platinum as an efficient nonradiative recombination center in silicon

Zhenxing Dai, Menglin Huang, Xin-Gao Gong, Shiyou Chen ยท 2026

Platinum (Pt) is widely used for carrier-lifetime control in silicon power devices, yet the microscopic nonradiative recombination mechanism of the substitutional platinum ($\text{Pt}_\text{Si}$) dopaโ€ฆ

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Physics Preprint PDF DOI

Kohn-Sham Hamiltonian from Effective Field Theory: Quasiparticle Band Narrowing from Frozen Core Dynamics

Xiansheng Cai, Han Wang, Kun Chen ยท 2026

Kohn-Sham (KS) eigenvalues are routinely compared with angle-resolved photoemission (ARPES) and used as input for many-body methods, yet density functional theory (DFT) assigns them no physical meaninโ€ฆ

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Physics Preprint PDF DOI

Identifying strong correlation using only the Kohn-Sham density of one-electron states

Daniel D. Rivera, Gustavo M. Dalpian, John P. Perdew ยท 2026

Strongly correlated systems have long been a central and highly non-trivial topic in condensed matter physics. At the non-interacting level, strong correlation can be associated with powerful (near) dโ€ฆ

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Physics Preprint PDF DOI

Modeling the Zero-Phonon Line of Strained SnV Centers in Diamond; Including Reflections on Computational Cost and Accuracy

Danny E. P. Vanpoucke ยท 2026

Among the group-IV vacancy color centers in diamond, the SnV holds promise for photonics based quantum applications. In this work, the Tin-Vacancy (SnV) zero-phonon line (ZPL) and its pressure coefficโ€ฆ

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Physics Preprint PDF DOI

Classifying magnons in itinerant ferromagnets from linear response TDDFT: Fe, Ni and Co revisited

Thorbj{o}rn Skovhus, Thomas Olsen ยท 2026

The magnetic excitation spectrum of itinerant magnets exhibits rich and complex spectral features that often complicate interpretation of the underlying physics. For perturbations in the long wavelengโ€ฆ

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Physics Preprint PDF DOI

Quantum $f$-divergences via Nussbaum-Szko{\l}a Distributions in Semifinite von Neumann Algebras

Theodoros Anastasiadis, George Androulakis ยท 2026

In this article, we prove that the quantum $f$-divergence between two normal states on a semifinite von~Neumann algebra is equal to the classical $f$-divergence between two corresponding classical staโ€ฆ

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Physics Preprint PDF DOI

Stripping Symmetry: Electrochemical Oxidation to a Superconducting Polar Metal in Au2Pb0.914P2

Scott B. Lee, Stephanie R. Dulovic, Joseph W. Stiles, Xin Zhang, Fatmagul Katmer, Sudipta Chatterjee, Jaime Moya, Allana G. Iwanicki, Abby N. Neill, Chris Lygouras, Tieyan Chang, Tyrel M. McQueen, Yu-Sheng Chen, Leslie M. Schoop ยท 2026

Polar metals and noncentrosymmetric superconductors are exceptionally rare, yet their broken inversion symmetry can give rise to emergent electronic phenomena including mixed singlet-triplet supercondโ€ฆ

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Physics Preprint PDF DOI

Photoinduced orbital polarization and Jahn-Teller effect in RNiO$_3$

Sangeeta Rajpurohit, Sheikh Rubaiat Ul Haque, Aaron M. Lindenberg, Peter E. Blochl, Tadashi Ogitsu ยท 2026

The orbital degree of freedom in rare-earth nickelates is typically inactive across the temperature-driven metal-insulator transition, where the system develops two inequivalent Ni sites associated wiโ€ฆ

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Physics Preprint PDF DOI

Spherical-tensor description of the Jahn--Teller--Hubbard molecule and local electron--phonon entanglement

Koichiro Takahashi, Shuichiro Ebata, Naotaka Yoshinaga, Shintaro Hoshino ยท 2026

We investigate the localized-electron character of the Mott-insulating phase in A$_3$C$_{60}$ using a single-site multiorbital electron model coupled to anisotropic molecular vibrations (Jahn--Teller โ€ฆ

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Physics Preprint PDF DOI

GPU acceleration of plane-wave density functional theory calculations in Abinit

Ioanna-Maria Lygatsika, Marc Sarraute, Lucas Baguet, Pierre Kestener, Marc Torrent ยท 2026

We report on the GPU porting of the Abinit high-performance simulation code for plane-wave DFT calculations. Large-scale electronic structure calculations require computing the electronic wave functioโ€ฆ

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Strictly correlated electrons in a quantum ring: from Kohn-Sham to Kantorovich potentials

Thiago Carvalho Corso ยท 2026

Our goal in this paper is twofold. First, we characterize the class of pairwise interactions for which the Seidl conjecture on the structure of optimal plans for the symmetric multimarginal optimal trโ€ฆ

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Machine Learning the order-disorder Jahn-Teller transition in LaMnO$_3$

Lorenzo Celiberti, Alexander Ehrentraut, Luca Leoni, Cesare Franchini ยท 2026

We investigate the Jahn-Teller structural phase transition in LaMnO$_3$ at $T_{JT} \simeq 750$ K using molecular dynamics simulations based on machine-learning force fields trained on ab initio data. โ€ฆ

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Reply to 'Comment on "Ideal clocks -- a convenient fiction'' '

Krzysztof Lorek, Jorma Louko, Andrzej Dragan ยท 2026

For a quantum scalar field that is confined in a uniformly linearly accelerated cavity in Minkowski spacetime and interacts linearly with a scalar field that is not confined in the cavity, a de-excitaโ€ฆ

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Reply to "Comment on `Unified neutrino mixing and approximate $\mu-\tau$ reflection symmetry'[arXiv:2603.00885]''

Yuta Hyodo, Teruyuki Kitabayashi ยท 2026

Huang and Li [arXiv:2603.00885] have raised the following two points regarding our previous work [arXiv:2502.18029]:(1) The real-value conditions associated with $\mu$-$\tau$ reflection symmetry were โ€ฆ

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Reply to: Comment on: Discontinuous codimension-two bifurcation in a Vlasov equation (arXiv:2603.22066)

Yoshiyuki Y. Yamaguchi, Julien Barre ยท 2026

The Comment criticizes the bifurcation analysis performed in the original paper on a Vlasov equation. This criticism can be traced back to a discrepancy in the definition of the paramagnetic phase. Apโ€ฆ

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Jahn-Teller distortion on strained La$_3$Ni$_2$O$_7$ thin films

Yuxin Wang, Zhan Wang, Fu-Chun Zhang, Kun Jiang ยท 2026

We present a systematic study of the electronic structure of strained La$_3$Ni$_2$O$_7$ thin films. We show that biaxial compressive strain mainly elongates the outer apical Ni-O bond while leaving thโ€ฆ

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Excitations across the equilibrium and photoinduced `hidden' states of magnetoresistive manganites

Shiyu Fan, Feng Jin, Taehun Kim, Umesh Kumar, Zixun Zhang, Vivek Bhartiya, Jiemin Li, Brandon Yalin, Yanhong Gu, Mingqiang Gu, Wen Hu, Claudio Mazzoli, G. Lawrence Carr, Osor S. Barisic, Andrey S. Mishchenko, Valentina Bisogni, Sobhit Singh, Wenbin Wu, Jonathan Pelliciari ยท 2026

"Hidden" phases, generated using ultrafast laser pulses (few hundred femtoseconds), with properties distinct from thermodynamic equilibrium, are appealing for technologies because they can be long-livโ€ฆ

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First principles electric field gradients at A and B site cations across the NaRTiO4 Ruddlesden Popper series

L. F. Almeida, A. N. Cesario, P. A. Sousa, P. Rocha-Rodrigues, L. V. C. Assali, H. M. Petrilli, J. P. Araujo, A. M. L. Lopes ยท 2026

The $n = 1$ Ruddlesden-Popper titanates, NaRTiO$_{4}$ (R = rare-earth), exhibit a structural behaviour where non-centrosymmetry is driven by cooperative oxygen octahedral rotations (OORs) rather than โ€ฆ

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Remarks on "Further comments on "Rebuttal of "Refutation of "Comment on "Reply to "Comments on "A genuinely natural information measure" " " " " " "

Z. Sommer, A. Winter ยท 2026

It's a bit tedious, but as John Doe and Jean Roe have insisted on offering further comments on our comprehensive refutation of the former's already tiringly obstinate advances, we feel compelled to reโ€ฆ

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