CMP Journal 2025-01-15

Statistics

Physical Review Letters: 4

Physical Review X: 1

Physical Review Letters

Disentangling Centrality Bias and Final-State Effects in the Production of High-\({p}_{T}\) Neutral Pions Using Direct Photon in \(d+\mathrm{Au}\) Collisions at \(\sqrt{ {s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}\)

Research article | Particle production | 2025-01-15 05:00 EST

N. J. Abdulameer et al. (PHENIX Collaboration)

PHENIX presents a simultaneous measurement of the production of direct $$ and \({\pi }^{0}\) in \(d+\mathrm{Au}\) collisions at \(\sqrt{ {s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}\) over a \({p}_{T}\) range of 7.5 to \(18\text{ }\text{ }\mathrm{GeV}/c\) for different event samples selected by event activity, i.e., charged-particle multiplicity detected at forward rapidity. Direct-photon yields are used to empirically estimate the contribution of hard-scattering processes in the different event samples. Using this estimate, the average nuclear-modification factor, \({R}_{d\mathrm{Au},\mathrm{EXP}}^{ {\pi }^{0}}\), is \(0.925\pm{}0.023(\mathrm{stat})\pm{}0.15(\mathrm{scale})\), consistent with unity for minimum-bias (MB) \(d+\mathrm{Au}\) collisions. For event classes with low and moderate event activity, \({R}_{d\mathrm{Au},\mathrm{EXP}}^{ {\pi }^{0}}\) is consistent with the MB value within 5% uncertainty. This result confirms that the previously observed enhancement of high-\({p}_{T}\) \({\pi }^{0}\) production found in small-system collisions with low event activity is a result of a bias in interpreting event activity within the Glauber framework. In contrast, for the top 5% of events with the highest event activity, \({R}_{d\mathrm{Au},\mathrm{EXP}}^{ {\pi }^{0}}\) is suppressed by 20% relative to the MB value with a significance of $4.5$, which may be due to final-state effects. This suppression corresponds to a \({p}_{T}\) shift of \(\delta {p}_{T}=0.213\pm{}0.055\text{ }\text{ }\mathrm{Gev}/c\) at \(9\text{ }\text{ }\mathrm{Gev}/c\).

Phys. Rev. Lett. 134, 022302 (2025)

Particle production, Relativistic heavy-ion collisions, Photons, Pions, Hadron colliders

Coherence of an Electronic Two-Level System under Continuous Charge Sensing by a Quantum Dot Detector

Research article | Carrier dynamics | 2025-01-15 05:00 EST

Subhomoy Haldar, Morten Munk, Harald Havir, Waqar Khan, Sebastian Lehmann, Claes Thelander, Kimberly A. Dick, Peter Samuelsson, Patrick P. Potts, and Ville F. Maisi

We investigate experimentally the quantum coherence of an electronic two-level system in a double quantum dot under continuous charge detection. The charge state of the two-level system is monitored by a capacitively coupled single quantum dot detector that imposes a backaction effect on the system. The measured backaction is well described by an additional decoherence rate, approximately linearly proportional to the detector electron tunneling rate. We provide a model for the decoherence rate arising due to level detuning fluctuations induced by detector charge fluctuations. The theory predicts a factor of 2 lower decoherence rates than observed in the experiment, suggesting the need for a more elaborate theory accounting for additional sources of decoherence.

Phys. Rev. Lett. 134, 023601 (2025)

Carrier dynamics, Coulomb blockade, Optical & microwave phenomena, Quantum coherence & coherence measures, Quantum fluctuations & noise, Quantum measurements, Radio frequency techniques, Transport phenomena, Double quantum dots, Quantum dots, Cavity resonators, Charge, Dilution refrigerator, Jaynes-Cummings model, Master equation, Spectroscopy

Magnon Spin Transport through Atomic Ferrimagnetic Domain Walls

Research article | Domain walls | 2025-01-15 05:00 EST

Zhaozhuo Zeng and Peng Yan

It is a well-established notion that the spin of a magnon should be flipped when it passes through a 180^ domain wall (DW) in both ferromagnets and antiferromagnets, while the magnon spin transport through ferrimagnetic DW is still elusive. In this Letter, we report that the magnon preserves its spin after the transmission through an atomically sharp DW in ferrimagnets due to the intriguing interband magnon scattering at the domain interface. This finding may provide significant insight to resolve the puzzling insensitivity of magnon spin diffusion to the 180^ ferrimagnetic DWs observed by recent experiments. Our results reveal the unique role of ferrimagnetic DWs in manipulating the magnon spin and may facilitate the design of novel magnonic devices based on ferrimagnets.

Phys. Rev. Lett. 134, 026701 (2025)

Domain walls, Magnons, Micromagnetism, Spin waves, Ferromagnets

Critical Avalanches in Excitation-Inhibition Balanced Networks Reconcile Response Reliability with Sensitivity for Optimal Neural Representation

Research article | Bifurcations | 2025-01-15 05:00 EST

Zhuda Yang, Junhao Liang, and Changsong Zhou

A new model reveals that bursts of neural activity known as critical avalanches underlie the brain's ability to respond consistently to stimuli.

Phys. Rev. Lett. 134, 028401 (2025)

Bifurcations, Neural encoding, Neuronal avalanches, Neuronal dynamics, Neuroscience, neural computation & artificial intelligence, Biological neural networks, Spiking neuron models

Physical Review X

Atomic-Scale Tracking of Topological Defect Motion and Incommensurate Charge Order Melting

Research article | Charge order | 2025-01-15 05:00 EST

Noah Schnitzer, Berit H. Goodge, Gregory Powers, Jaewook Kim, Sang-Wook Cheong, Ismail El Baggari, and Lena F. Kourkoutis

A cryogenic microscope reveals the atomic-scale processes that disrupt the charge-ordered state in a material as the temperature rises.

Phys. Rev. X 15, 011007 (2025)

Charge order, Topological defects, Oxides, Cryo-transmission electron microscopy, Scanning transmission electron microscopy