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Nov 1, 2024 | 
pubs.aip.org | Département de Physique |École Normale Supérieure |Université PSL
Global data transmission is witnessing an unprecedented surge in daily data flows and keeps on increasing the need for dependable high-speed data communication. Free-Space Optics (FSO) has attracted interest as a possible solution to the so-called “last mile” connectivity problems,1 to replace fiber connections whenever their installation is too expensive or not permanent.
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Oct 11, 2024 | 
link.aps.org | Lu Chen |Institut quantique |Département de Physique |Université de Sherbrooke
Popular Summary The conventional thermal Hall effect—the thermal analog of the electrical Hall effect—is a powerful technique to probe neutral excitations in various quantum materials. Typically, the effect describes the emergence of a heat current perpendicular to a thermal gradient after the introduction of an orthogonal magnetic field.
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Jul 2, 2024 | 
link.aps.org | Institut quantique |Département de Physique |Université de Sherbrooke
Universal quantum computers require a large network of qubits robust against errors. Recent theoretical and experimental studies on donor nuclear spins in silicon, engineered on semiconductor platforms compatible with industrial fabrication, show their coherent behavior and potential for scalability. Here we present a hardware-efficient quantum protocol that corrects phase flips of a nuclear spin using explicit experimentally feasible operations.
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Jun 13, 2024 | 
opg.optica.org | Pierre Bernard |Département de Physique |Jerald R. Izatt |Montée Ste-Julie
An intracavity double-resonance technique has been used to study three K-type doublets in the portion of the CH3OH torsional–rotational–vibrational level structure which can be pumped by the CO2 10R(38) laser line to produce submillimeter (SMM) laser action. Measurements of the doublet spacings yield a value of S(4) = 2.1(1) × 10−9 for the first excited state of the ν8 vibrational mode.
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Jun 5, 2024 | 
academic.oup.com | Denys Wilkinson Building |Keble Road |Département de Physique |Université Laval
Results from the past two decades of optical imaging (e.g. the Sloan Digital Sky Survey, SDSS; York et al. 2000) of the local (redshifts z ≲ 0.1) Universe have revealed the existence of a bimodality in the distribution of local galaxies: blue star-forming late-type galaxies (LTGs) form a so-called star-forming ‘main sequence’ and red quiescent early-type galaxies (ETGs) form a ‘red sequence’ (e.g. Kauffmann et al. 2003; Cirasuolo et al. 2007).
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Jun 5, 2024 | 
academic.oup.com | Denys Wilkinson Building |Keble Road |Cambridge MA |Département de Physique
Early-type galaxies (ETGs) are known to harbour dense spheroids of stars but scarce star formation (SF). Approximately a quarter of these galaxies have rich molecular gas reservoirs yet do not form stars efficiently. We study here the ETG NGC 524, with strong shear suspected to result in a smooth molecular gas disc and low star-formation efficiency (SFE).
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Apr 15, 2024 | 
link.aps.org | Département de Physique |Institut quantique |Université de Sherbrooke |Stony Brook
Abstract In cosmology, the axion is a hypothetical particle that is currently considered as candidate for dark matter. In condensed matter, a counterpart of the axion (the “axion quasiparticle”) has been predicted to emerge in magnetoelectric insulators with fluctuating magnetic order and in charge-ordered Weyl semimetals. To date, both the cosmological and condensed-matter axions remain experimentally elusive or unconfirmed.
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Feb 6, 2024 | 
link.aps.org | Mathieu Belanger |Département de Physique |Institut quantique |Université de Sherbrooke
We study a one-band Hubbard model of twisted bilayer cuprates with a twist angle of 53.13∘. By introducing an interlayer bias, we simulate heterobilayers of different dopings. Using the variational cluster approximation, we probe the effect of this bias on the time-reversal symmetry-breaking (TRSB) phase. Doping differences between layers affect the region where TRSB occurs; we construct a phase diagram mapping out the TRSB phase in the n1−n2 plane, with nℓ being the electron density on layer ℓ.
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Dec 9, 2023 | 
academic.oup.com | Département de Physique |Space Exploration
The JWST Early Release Observations (ERO) included a NIRISS/SOSS (0.6–2.8 μm) transit of the ∼ 850 K Saturn-mass exoplanet HAT-P-18 b. Initial analysis of these data reported detections of water, escaping helium, and haze. However, active K dwarfs like HAT-P-18 possess surface heterogeneities — starspots and faculae — that can complicate the interpretation of transmission spectra, and indeed, a spot-crossing event is present in HAT-P-18 b’s NIRISS/SOSS light curves.
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Aug 16, 2023 | 
link.aps.org | Alexander McDonald |Institut quantique |Département de Physique |Université de Sherbrooke
The connections between standard theoretical tools used to study open quantum systems can sometimes seem opaque. Whether it is a Lindblad master equation, the equation of motion for the Wigner function, or a dissipative Keldysh action, features evident in one formalism are often masked in another. Here, we reformulate the technique of third quantization in a way that explicitly connects all three methods.
