Tootfinder

A plasmoid-model for mass loss from stars on the upper red giant branch: The mass loss rate is controlled by the number of density scale heights in the convection zone
J. MacDonald, D. J. Mullan
https://arxiv.org/abs/2508.05480

A plasmoid-model for mass loss from stars on the upper red giant branch: The mass loss rate is controlled by the number of density scale heights in the convection zone
Recent asteroseismic determinations of ΔM, the integrated mass loss on the red giant branch (RGB), for fields stars show a trend of ΔM decreasing as metallicity increases. This trend among field stars is inconsistent with many existing models of RGB mass loss. The present paper is motivated by a 'plasmoid' model of RGB mass loss in which magnetic flux loops, generated by a shear dynamo operating below the convection zone, are buoyed up to the stellar surface starting at the evolutionary stage…

A Screen-printed, Silver-nanowire-based Optically Transparent Wideband Reconfigurable Intelligent Surface for 5G mmWave Applications
Yiming Yang, Mohammad Vaseem, Ruiqi Wang, Behrooz Makki, Atif Shamim
https://arxiv.org/abs/2509.05981

A Screen-printed, Silver-nanowire-based Optically Transparent Wideband Reconfigurable Intelligent Surface for 5G mmWave Applications
The reconfigurable intelligent surface (RIS) can help establish secondary line-of-sight links for 5G mmWave and beyond applications to cater for the large path loss and blockage in millimeter-wave direct links. It is desirable that the RISs are optically transparent so that they can be placed on building windows, etc. However, traditional transparent designs with indium tin oxide films have challenges of high loss and low transparency, while metallic meshes suffer from a large feature size for …

Spin-orbit interaction, band topology, and spin texture in BiInO3(001) surface
Ramsamoj Kewat, Nirmal Ganguli
https://arxiv.org/abs/2506.21438 https://

Spin-orbit interaction, band topology, and spin texture in BiInO3(001) surface
This research investigates the implication of spin-orbit interaction (SOI) and symmetry on the band topology and spin texture at the (001) surface of BiInO$_3$. Using density functional theory (DFT) and symmetry analysis, the study explores the impact of surface termination on the electronic structure, particularly focusing on how the loss of translational symmetry at the surface influences the band topology of the surface states. Key findings include discovering two dangling surface states (na…

Active IRS-Enabled Integrated Sensing and Communications with Extended Targets
Yuan Fang, Xianxin Song, Huazhou Hou, Ziguo Zhong, Xianghao Yu, Jie Xu, Yongming Huang
https://arxiv.org/abs/2508.00379

Active IRS-Enabled Integrated Sensing and Communications with Extended Targets
This paper studies the active intelligent reflecting surface (IRS)-enabled integrated sensing and communications (ISAC), in which an active IRS is deployed to assist the base station (BS) in serving multiple communication users (CUs) and simultaneously sensing an \emph{extended} target at the non-line-of-sight (NLoS) area of the BS. The active IRS has the capability of amplifying the reflected signals so as to overcome significant reflection path loss in NLoS communication and sensing. In parti…

Great comet C/2023 A3 (Tsuchinshan-ATLAS): dust loss before perihelion
Bin Liu, Man-To Hui, Xiaodong Liu
https://arxiv.org/abs/2507.12756 https://

Great comet C/2023 A3 (Tsuchinshan-ATLAS): dust loss before perihelion
In this study, the dust loss of comet C/2023 A3 (Tsuchinshan-ATLAS) is investigated through the analysis of archival images. By measuring the surface brightness profile of the coma, we determined that the comet maintained nearly in a steady state during the observations. Analysis of the dust distribution perpendicular to the orbital plane reveals that the ejection velocity is $v_{\perp}\sim(65\pm5)\,β^{1/2}$ m s$^{-1}$, where $β$ is inversely proportional to the size of the dust grains. From …

Diversity in Hydrogen-rich Envelope Mass of Type II Supernovae. (III). The mass-loss and evolutionary pathways of the red supergiant progenitors
Qiliang Fang, Takashi J. Moriya, Keiichi Maeda, Andris Dorozsmai, Javier Silva-Farf\'an
https://arxiv.org/abs/2507.14665

Diversity in Hydrogen-rich Envelope Mass of Type II Supernovae. (III). The mass-loss and evolutionary pathways of the red supergiant progenitors
We present a comprehensive analysis of 32 type II supernovae (SNe II) with plateau phase photometry and late phase ($nebular$) spectroscopy available, aiming to bridge the gap between the surface and core of their red supergiant (RSG) progenitors. Using \texttt{MESA}\,+\texttt{STELLA}, we compute an extensive grid of SN II light curve models originating from RSG with effective temperatures $T_{\rm eff}$ around 3650\,K and hydrogen-rich envelopes artificially stripped to varying degrees. These m…

Comparison of spin-qubit architectures for quantum error-correcting codes
Mauricio Guti\'errez, Juan S. Rojas-Arias, David Obando, Chien-Yuan Chang
https://arxiv.org/abs/2506.17190

Comparison of spin-qubit architectures for quantum error-correcting codes
We investigate the performance of two quantum error-correcting codes, the surface code and the Bacon-Shor code, for implementation with spin qubits in silicon. In each case, we construct a logical qubit using a planar array of quantum dots, exploring two encoding schemes: one based solely on single-electron Zeeman qubits (Loss-DiVincenzo qubits), and a hybrid approach combining Zeeman and singlet-triplet qubits. For both codes, we evaluate key performance metrics, including logical state prepar…

Full-body WPT: wireless powering with meandered e-textiles
Ryo Takahashi, Takashi Sato, Wakako Yukita, Tomoyuki Yokota, Takao Someya, Yoshihiro Kawahara
https://arxiv.org/abs/2506.17606

Full-body WPT: wireless powering with meandered e-textiles
We present Full-body WPT, wireless power networking around the human body using a meandered textile coil. Unlike traditional inductive systems that emit strong fields into the deep tissue inside the body, the meander coil enables localized generation of strong magnetic field constrained to the skin surface, even when scaled to the size of the human body. Such localized inductive system enhances both safety and efficiency of wireless power around the body. Furthermore, the use of low-loss conduc…

ASTARS empowered Satellite Positioning Approach for Urban Canyons and Indoor Environments
Yu Zhang, Xin Sun, Tianwei Hou, Anna Li, Sofie Pollin, Yuanwei Liu, Arumugam Nallanathan
https://arxiv.org/abs/2507.01783

ASTARS empowered Satellite Positioning Approach for Urban Canyons and Indoor Environments
To mitigate the loss of satellite navigation signals in urban canyons and indoor environments, we propose an active simultaneous transmitting and reflecting reconfigurable intelligent surface (ASTARS) empowered satellite positioning approach. Deployed on building structures, ASTARS reflects navigation signals to outdoor receivers in urban canyons and transmits signals indoors to bypass obstructions, providing high-precision positioning services to receivers in non-line-of-sight (NLoS) areas. Th…

Effect of Matter Accretion on Lithium Enhancement of Giants
Xuefeng Li, Jianrong Shi, Yan Li, Hongliang Yan, Jinghua Zhang, Fei Guo
https://arxiv.org/abs/2508.00405 https://

Effect of Matter Accretion on Lithium Enhancement of Giants
A subset of low-mass giants ($<2.2\,M_{\odot}$) exhibit anomalous lithium enhancement behavior, which is still an open topic. Given that more massive giants retain more surface lithium, increasing mass by accreting circumstellar matter could be a channel to enrich lithium. We evaluate this process in the current work. Using MESA, we construct a model of matter accretion, including mass loss, that evolves a star from the main sequence turnoff to the red giant branch tip. The mean accretion rate …

A Haldane-Anderson Hamiltonian Model for Hyperthermal Hydrogen Scattering from a Semiconductor Surface
Xuexun Lu, Nils Hertl, Reinhard J. Maurer
https://arxiv.org/abs/2508.13360

A Haldane-Anderson Hamiltonian Model for Hyperthermal Hydrogen Scattering from a Semiconductor Surface
Collisions of atoms and molecules with metal surfaces create electronic excitations in the metal, leading to nonadiabatic energy dissipation, inelastic scattering, and sticking. Mixed quantum-classical molecular dynamics simulation methods, such as molecular dynamics with electronic friction, are able to capture nonadiabatic energy loss during dynamics at metal surfaces. Hydrogen atom scattering on semiconductors, on the other hand, exhibits strong adsorbate-surface energy transfer only when th…

Replaced article(s) found for physics.acc-ph. https://arxiv.org/list/physics.acc-ph/new
[1/1]:
- Analysis of RF Surface Loss in a Planar 2D Qubit
Andrei Lunin, Mustafa Bal, Akshay Murthy, Shaojiang Zhu, Anna Grassellino, Alexander Romanenko

Improving the lifetime of aluminum-based superconducting qubits through atomic layer etching and deposition
Neha Mahuli (AWS Center for Quantum Computing, Pasadena, CA, USA), Joaquin Minguzzi (AWS Center for Quantum Computing, Pasadena, CA, USA), Jiansong Gao (AWS Center for Quantum Computing, Pasadena, CA, USA), Rachel Resnick (Google Research), Sandra Diez (National Institute of Standards and Technology), Cosmic Raj (AWS Center for Quantum Computing, Pasadena, CA, USA), Guillaume Mar…

Improving the lifetime of aluminum-based superconducting qubits through atomic layer etching and deposition
We present a dry surface treatment combining atomic layer etching and deposition (ALE and ALD) to mitigate dielectric loss in fully fabricated superconducting quantum devices formed from aluminum thin films on silicon. The treatment, performed as a final processing step prior to device packaging, starts by conformally removing the native metal oxide and fabrication residues from the exposed surfaces through ALE before \textit{in situ} encapsulating the metal surfaces with a thin dielectric laye…

Energy relaxation in superthermal collisions of carbon with oxygen: the influence of isotopic substitution
Cheikh T. Bop, Marko Gacesa
https://arxiv.org/abs/2508.12807 https://

Energy relaxation in superthermal collisions of carbon with oxygen: the influence of isotopic substitution
The transition from a once-dense Martian atmosphere to the thin one observed today implies a substantial loss of carbon, either through atmospheric escape or surface deposition. Accurately modeling this carbon escape necessitates accounting for collisions between energetic carbon atoms and the primary atmospheric constituents, including oxygen. To this end, we computed a highly accurate and comprehensive set of potential energy curves (PECs) for the C($^3$P) + O($^3$P) system. Based on these PE…