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Michael M. Cawte et al. receive the Select label

13 March 2019

"Snell's Law for a vortex dipole in a Bose-Einstein condensate" by Michael M. Cawte, Xiaoquan Yu, Brian P. Anderson, Ashton S. Bradley has received the Select label. Warm congratulations to the authors!

This paper provides a useful guide for the behaviour of vortex dipoles as they pass through interfaces of sharply changing density, including a thorough numerical study and consequent analysis. As part of this analysis, the authors compare the values of the reflection/refraction vs. incident angles in vortex dipoles with a Snell’s law-like analytical prediction, achieving good agreement between the two before and after the interface. However, the authors found that when passing near the interface the dipole can exhibit dynamics that depart significantly from standard ray optics, involving transient capture by the interface. They conclude that despite the added complexity, an analogue Snell’s law is still applicable for the incoming and outgoing dipole paths when interacting with a sharp interface. This interesting and thorough study could guide future experiments on vortices in flattened geometries.

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Leiden becomes a SciPost Sponsor

26 February 2019

SciPost is very happy to announce that the University of Leiden has become a Sponsor through a generous €10 000 contribution. Based on current estimates, this is sufficient to cover the whole submission and publication process for more than 25 articles. SciPost is extremely thankful for this support, and will devote the resources to its services for the academic community worldwide.

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Shang-Chun Lin and Martin Oettel receive the Select label

26 February 2019

"A classical density functional from machine learning and a convolutional neural network" by Shang-Chun Lin and Martin Oettel has received the Select label. Warm congratulations to the authors!

This brilliant paper presents an inspiring conceptual DFT study, using machine learning methods to approximate a classical density functional, obtaining precise data for density distributions in given external potentials. In addition, they relate these simulations to their theoretical considerations, which encompass a variety of elements from classical liquid state theory to machine learning techniques. Conceptually, this goes far beyond what has been done in electronic structure DFT using machine learning. The hybrid approach of the current paper gives much insight into the formal (analytical) structure of the attractive contribution to the excess free energy functional. With the increasing use of machine learning, this study points towards the future direction on how to use it in the field of DFT.

First Volume of SciPost Physics Proceedings

22 February 2019

This month we have published the first volume of SciPost Physics Proceedings. The conference covered in this issue is the The 15th International Workshop on Tau Lepton Physics (Amsterdam, 24-28 September 2018).

This is the fifteenth workshop of TAU series on physics of the tau lepton, its neutrino, and related processes. The goal of the workshop was to get theorists and experimentalists together to discuss recent progress in the field. New results from high energy machines (e.g LHC experiments: ATLAS, CMS, LHCb), low energy machines (BES-III and other) and B-factories (including Belle-2) will be presented as well as recent results from g-2 and neutrino oscillation experiments. The program also includes related subjects such as hadron cross section measurement at e+e- colliders, lepton universality puzzles in meson decays, searches for Lepton Flavour Violation in τ and μ decays and review talks on the future experiments.

The refereeing of resulting proceedings volume has been managed by our guest fellows Dr. Marcus Matthias Morgenstern and Prof. Olga Igonkina. It contains 53 articles covering topics related to the tau lepton, neutrino and the related processes and possible experiments to detect them.

Full Proceedings

Beenakker et al. receive the Select label

11 February 2019

"Electrical detection of the Majorana fusion rule for chiral edge vortices in a topological superconductor" by C. W. J. Beenakker, A. Grabsch and Y. Herasymenko has received the Select label. Warm congratulations to the authors!

This publication presents a highly novel approach to tackle the demonstration of non-Abelian fusion rules of Majorana zero-modes, which can open a new line of research in the field of Majorana zero-modes. Building on recent research, the authors study how the injection at the edge vortices in systems with chiral Majorana edges affect the non-local fermion parity, and are able to observe this behaviour in electrical measurements.The proposed experiments can be applied to hybrid topological insulator/superconductor systems, and can be an important next step in the rapidly developing field of topological superconductors.

Full article

Komargodski et al. receive the Select label

9 January 2019

"Comments on abelian Higgs models and persistent order" by Zohar Komargodski, Adar Sharon, Ryan Thorngren and Xinan Zhou has received the Select label. Warm congratulations to the authors!

This paper deals with the question regarding deformations of trivial gapped phases within Quantum Field Theory. In fact, it gives an interesting demonstration of the fact that even simple bosonic systems can have anomalies of discrete symmetries. The existence of anomalies implies that the theory cannot be completely disordered with a trivial gapped phase without topological order. The authors specifically connect these results with possible strong coupling regions. Finally, the authors discuss the important implications regarding whether the symmetries can be disordered or not. The models they discuss also are relevant to condensed matter systems.

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Austrian consortium sponsors SciPost

12 December 2018

We are extremely pleased to announce that Austria will form the first national consortium to sponsor SciPost. Led by the FWF, this consortium includes the Universities of Graz, Innsbruck, Linz, Salzburg and Vienna, the Technical Universities of Graz and of Vienna, the Montanuniversität Leoben, the IST Austria, and the Austrian Academy of Sciences. The consortium will sponsor SciPost for a period of 5 years.

These resources will be entirely dedicated to furthering SciPost's mission to transform scientific publishing by providing a Genuine Open Access solution to researchers worldwide. Our operations naturally align with and fulfil the requirements of the ambitions formulated in Plan S from cOAlition S.

Many Austrian researchers have already adopted and contributed to the SciPost platform, and we hope that this mark of recognition from this consortium will encourage many more to join in and further fuel our expanding operations.

Press release from FWF

Ejima et al. receive the Select label

7 December 2018

"Exotic criticality in the dimerized spin-1 X X Z chain with single-ion anisotropy" by Satoshi Ejima, Tomoki Yamaguchi, Fabian H. L. Essler, Florian Lange, Yukinori Ohta and Holger Fehske has received the Select label. Warm congratulations to the authors!

In this very well written paper, the authors provide a comprehensive study of the phase diagram of the dimerized spin-1 XXZ chain with single-ion anisotropy. In addition, the authors were able to validate their results by an extensive field-theory analysis as well as DMRG, which ensures a quantitatively correct phase diagram. Overall, this paper will not only be important as a theoretical contribution for theoretical quantum physics, but also for experimental studies concerning spin chain compounds.

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Mark et al. receive a Select label

29 November 2018

"Mott-insulator-aided detection of ultra-narrow Feshbach resonances" by Manfred J. Mark, Florian Meinert, Katharina Lauber, Hanns-Christoph Nägerl has received the Select label. Warm congratulations to the authors!

This innovative paper shows a new way of studying bound states in atom-atom scattering, and gives an exact demonstrator on how to measure very narrow Feshbach resonances. Although the authors used cesium in their demonstrator, other atoms with complex and overlapping Feshbach spectra like dipolar lanthanides could also benefit from this study. In general, these results provide a powerful tool to identify and characterise narrow scattering resonances. Therefore, this research has the potential to improve the accuracy of coupled-channels calculations of molecular potentials, may lead to new ways for the field of spectroscopy, and can ultimately give a new impulse to the study of interacting quantum matter.

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Gorbenko et al. receive a Select label

20 November 2018

"Walking, Weak first-order transitions, and Complex CFTs II. Two-dimensional Potts model at Q>4" by Victor Gorbenko, Slava Rychkov, Bernardo Zan has received the Select label. Warm congratulations to the authors!

This theoretical high energy physics paper studies the slow Renormalization Group (RG) evolution using a 2D Potts model with Q > 4. First, the authors define new complex Conformal Field Theories (CFTs). Then, these new CFTs are used to develop a conformal perturbation approach that describe slow real coupling trajectories in the vicinity of these complex CFTs. The Potts model was used to develop these CFTs because, apart from its own significance, it serves as an ideal playground for testing this very general relation. Here, one will find a thorough discussion of all conceptual issues related to the topic, and the theories developed can be further used as a smoking gun for detecting walking in Monte Carlo simulations.

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