Enjoy the latest episodes from MacStories’ family of podcasts:

AppStories

This week, John and Federico discuss the changing face of the AI-fueled App Store and questionable changes made to TestFlight before going into the nerdiest details of Open Minis, an iOS app that brings desktop-class agents onto the iPhone and iPad.

Then on AppStories+, Federico and John explore Cmux, a Mac terminal app with an iPhone and iPad beta that makes it easier than ever to sync coding projects across devices.

NPC: Next Portable Console

This week, the refreshingly complete announcement by Anbernic of the RG SP, Ticci buys a handheld, and people are tired of months-long hardware reveals.

Then on NPC XL, Cocoon 3.0 and Syncthing!

Comfort Zone

We have a guest! D. Griffin Jones is here to show the gang technology they could only dream of: the MessagePad. After that, we look at the brand new Pastebot 3 and the surprisingly useful Clop, and we close it out by trying to sell Niléane on a 3D printer.

This week’s Cozy Zone is all about the games we’ve been enjoying lately.

MacStories Unwind

This week, John realizes that too much Wi-Fi is never enough, Federico wonders what he’s going to do with a Linux PC, and John recommends Apple TV’s Lucky.

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AppStories, Episode 495, ‘Open Minis Turns iOS into an Agent Playground’ Show Notes

This episode is sponsored by:

• Inoreader – Build Your Own Newsfeed and Cut Through the Noise
• Claude – For problems worth solving — get started with Claude today.
• Scribe – AI-powered workflow documentation. Get your first month free.

App Store Chaos

• App Store Chaos
• See also: A.I. ‘Vibecoded’ Apps Are Flooding Apple’s App Store

TestFlight Woes

• TestFlight: One Step Forward, Two Steps Back
• See also: Apple just improved TestFlight for users with a lot of beta apps

Open Minis

• Open Minis on the App Store
• Open Minis Is the iOS Agent I Wish Siri AI Could Be

AppStories+ Post-Show

• Cmux
• Founder’s Edition ($30) includes iOS beta
• CLIProxyAPI

Subscribe to AppStories+

Visit AppStories.net to learn more about the extended, high bitrate audio version of AppStories that is delivered early each week and subscribe.

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NPC, Episode 90, ‘The Stickless Clamshell Everyone Wanted’ Show Notes

The Latest Portable Gaming News

• Anbernic Announces the RG SP With Almost Everything We Need to Know
• Retroid Pocket Nova Gets Hands-On Treatment Ahead of Release
  • See also Russ’ video at Retro Game Corps
• AYANEO Restocks the Pocket Micro 2 Again
• MANGMI AIR Y and AIR Y Pro Full Spec Sheet Finally Revealed
• Handheld Makers Need to Stop Turning Every New Handheld Into a Month-Long Reveal

Subscribe to NPC XL

NPC XL is a weekly members-only version of NPC with extra content, available exclusively through our new Patreon for $5/month. Each week on NPC XL, Federico, Brendon, and John record a special segment or deep dive about a particular topic that is released alongside the “regular” NPC episodes. You can subscribe here.

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Comfort Zone, Episode 111, ‘I’m the Guest, I Have No Consequences’ Show Notes

Things Discussed

• Griffin’s blog
• Apple MessagePad
• Pastebot 3
• Clop
• Omori on Nintendo Store
• Xenoblade Chronicles: Definitive Edition

Cozy Zone

For even more from the Comfort Zone crew, you can subscribe to Cozy Zone. Cozy Zone is a weekly bonus episode of Comfort Zone where Matt, Niléane, and Chris invite listeners to join them in the Cozy Zone where they’ll cover extra topics, invent wilder challenges and games, and share all their great (and not so great) takes on tech. You can subscribe to Cozy Zone for $5 per month here or $50 per year here.

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MacStories Unwind, ‘Flooding the Wi-Fi Zone’ Show Notes

Networking Projects

• John’s existing setup
  • TP-Link Tri-Band Wi-Fi 7 BE22000 Whole Home Mesh System
  • Added 2 TP-Link Deco 7 Pro BE63 Tri-Band WiFi 7 BE10000 routers
• Federico’s Beelink SER9 Pro mini PC
• More of our networking and other gear is on MacStories Setups.

Picks

• John’s Pick: Lucky on Apple TV

Unwind Deal

• Meet the Parents Triple Feature starring Ben Stiller and Robert DeNiro is on sale for $17.99 in the TV app.

MacStories Unwind+

We deliver MacStories Unwind+ to Club MacStories subscribers ad-free with high bitrate audio every week. To learn more about the benefits of a Club MacStories subscription, visit our Plans page.

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MacStories launched its first podcast in 2017 with AppStories. Since then, the lineup has expanded to include a family of weekly shows that also includes MacStories Unwind, Magic Rays of Light, Comfort Zone, NPC: Next Portable Console, and First, Last, Everything that collectively, cover a broad range of the modern media world from Apple’s streaming service and videogame hardware to apps for a growing audience that appreciates our thoughtful, in-depth approach to media.

If you’re interested in advertising on our shows, you can learn more here or by contacting our Managing Editor, John Voorhees.

Playing as recent arrival Lena, your challenges include learning a new language and uncovering family secrets – its developer hopes it will spread ‘a little more compassion’

The cosy house-sorting sim has become a much-loved staple of the PC indie scene. Titles such as Unpacking, A Little to the Left and Momento charm players with their detailed interiors and quiet narratives of lives lived and shared within the same four walls. For Clean Start, Polish developer Serious Sim has taken a different approach – here you play as domestic cleaner, Lena, an immigrant who has arrived in an unspecified western country with little knowledge of the local language, and a family to support back home.

From here, you’re tasked with cleaning a series of houses and apartments, polishing tables, tidying shelves and scrubbing muddy pawprints from kitchen floors. It seems you’re able to rearrange the rooms, giving them a personal feel, which is after all one of the most pleasing elements of the genre. You can also, we are reassured, pet the dog.

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© Photograph: Serious Sim, Amplified Games

© Photograph: Serious Sim, Amplified Games

© Photograph: Serious Sim, Amplified Games

Hidden gems can be unearthed, but you have to dig deep into the bargain bins of countless outdated Fifas, Wii Fits without the controllers and partially finished quizshow games

As an eternally optimistic charity shop fan, I hold on to the fantasy that one day I’ll walk into my local Oxfam and find a pristine copy of the Sega Saturn shooter Burning Rangers for £1.50. Or perhaps a box full of old Neo Geo carts for a quid each. Sadly, this is now unlikely. Charity shops have caught on to the fact that old video games – like old vinyl albums – are highly collectible, and so they’re putting the good stuff on eBay. That’s fine, it’s their job to raise money, not to provide opportunist swine like me with bargains. But what games can you find tucked away in your local branch of Barnardo’s? To find out I visited about 40 charity stores across the country. Here is what I discovered on the shelves … And please do share your own charity shop gaming finds in the comments!

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© Photograph: Keith Stuart/The Guardian

© Photograph: Keith Stuart/The Guardian

© Photograph: Keith Stuart/The Guardian

One of the most striking discoveries in condensed matter physics over the past few years is that simply rotating one atomically thin crystal on top of an identical layer can create entirely new electronic behavior. This idea became famous in 2018, when physicists found that graphene sheets stacked at a very particular “magic angle” could turn into a superconductor, even though a single sheet of graphene is not. That discovery launched an entire field, sometimes called twistronics, built around moiré patterns: the large-scale interference patterns that appear when two crystal lattices are laid on top of each other with a slight mismatch in angle or spacing. In many materials, these patterns reshape how electrons move, sometimes producing superconductivity or other exotic collective states.

Moiré collapse

Most of this research has focused on materials whose crystal structure looks roughly the same in every direction, such as graphene, where the interesting physics shows up only at very small twist angles, close to perfect alignment. Now, a team of researchers instead looks at a strongly directional material: bilayer black phosphorus, whose atomic structure behaves very differently along two perpendicular directions in the plane, somewhat like a fabric that stretches easily one way but not the other. That built-in directionality turns out to change the whole logic of moiré physics, producing an effect the authors call moiré collapse. ¹

In black phosphorus, the two layers start out rotated 90 degrees relative to each other. As that angle is dialed away from 90 degrees, the moiré pattern does something unusual. Rather than staying a two-dimensional pattern, like a slowly shifting checkerboard, it stretches more and more along one direction until, at a specific angle that depends only on the material’s own geometry, it effectively stops repeating in the other direction altogether. What remains behaves like a one-dimensional crystal, even though the material is still built from ordinary two-dimensional atomic sheets. For twisted bilayer black phosphorus, the calculations place this collapse at a twist of about 71.6 degrees, or equivalently about 18.4 degrees away from the initial 90-degree arrangement.

Pure geometry

This transformation has nothing to do with how electrons repel or attract each other; it is pure geometry. The mathematical description of the moiré pattern, expressed in terms of the directions in which its periodicity repeats, is squeezed from two independent directions down to one. In ordinary space, this means the pattern keeps a well-defined repeat distance along one axis while stretching out indefinitely along the other, with no repeating pattern left in that direction at all.

Such a dramatic structural change reshapes the electrons riding on top of it. At the untwisted 90-degree configuration, the anisotropy of one layer happens to cancel out the anisotropy of the other, so electrons move about equally well in every in-plane direction. As the twist angle approaches the collapse point, that cancellation breaks down. The electron energy bands become sharply directional, and electrons increasingly travel along one preferred line rather than spreading across the plane. Their energy spectrum starts to show the telltale fingerprints of one-dimensional systems, including sharp spikes in the density of available electron states known as one-dimensional van Hove singularities.

Luttinger liquid physics

One-dimensional conductors behave very differently from ordinary metals. In a three-dimensional metal, electrons can mostly be treated as independent particles that only weakly notice one another. Confine them to a single dimension, however, and that picture stops working: electrons cannot slip past each other, so they are forced to move collectively, in a coordinated wave-like fashion. The framework that describes this collective behavior, called Luttinger liquid theory, traces back to work by Sin-Itiro Tomonaga in 1950 and Joaquin Luttinger in 1963, and it has since been confirmed experimentally in systems such as carbon nanotubes. In a Luttinger liquid, the basic excitations are not single electrons at all, but collective ripples of charge and spin, and this leads to electrical transport properties that look qualitatively different from those of a normal metal.

The calculations in this study show that moiré collapse naturally sets up the conditions Luttinger liquid physics requires. As the collapse angle is approached, the one-dimensional electronic channels that form become progressively less coupled to their neighbors, making the correlated, wave-like behavior increasingly favorable. The analysis estimates a Luttinger parameter of about 0.3 for the collapsed black phosphorus system, a value indicating strong electron-electron interactions, and it predicts distinctive collective charge oscillations and unusual, non-metallic patterns in electrical conduction that could, in principle, be measured in the laboratory.

A notable feature of this mechanism is that the electron bands stay quite dispersive even at collapse, with electron speeds exceeding 100 kilometers per second. This sets it apart from most previously studied moiré systems, including twisted graphene, where strong correlations usually arise because the electronic bands become extremely flat and electrons effectively slow to a crawl. Here, the correlated behavior instead comes from the geometric collapse of the moiré lattice itself, with fast-moving electrons confined to one dimension rather than slow ones spread over two.

Moiré collapse is not a peculiarity of one material

To test these ideas, the researchers combined simplified mathematical models with detailed first-principles calculations of the atomic and electronic structure. Beyond black phosphorus, they found the same collapse in twisted bilayer tin selenide, another layered material with strongly directional bonding. The details of the electronic structure differ somewhat because of the specific atomic orbitals involved, but the same geometric collapse into quasi-one-dimensional channels appears, suggesting the phenomenon is not a peculiarity of one material but a general consequence of twisting any sufficiently anisotropic crystal.

Taken together, the findings outline a different strategy for engineering exotic quantum matter. Instead of hunting for a special magic angle that flattens electronic bands, as in twisted graphene, this approach relies on a purely geometric collapse angle at which a two-dimensional moiré material naturally turns one-dimensional. If confirmed in experiments, it would offer a new and versatile platform for studying Luttinger liquids and other correlated electronic phases that only emerge when electrons are squeezed into moving along a single line.

 

Author: César Tomé López is a science writer and the editor of Mapping Ignorance

Disclaimer: Parts of this article may have been copied verbatim or almost verbatim from the referenced research paper/s.

The post Moiré collapse, when a twisted crystal becomes one-dimensional appeared first on Mapping Ignorance.

Deep underground the player joins a colony of ruthlessly exploited pit workers who could be taking on the bosses. How things play out will depend on you

It is rare for video games to feature industrial action as a key theme, but it does happen. There’s the shady Dockworker’s Union in Disco Elysium and the Orbital Workers Union in space adventure Tacoma; then there is Lynx, the evil union-bashing corp in Hardspace: Shipbreaker. Soon we can add A Line Held Tight, a visual novel that puts workers’ rights – and workers’ lives – at the very centre of the narrative.

In the distant future, a colony of miners digs far beneath the surface of an isolated planet, searching for veins of some exotic ore, protected from the poisonous atmosphere within giant mech suits. But the working conditions are woeful and as a strike looms, an unpopular employee named the Canary must decide whether or not to stand with colleagues and fight against suppression. The player, of course, takes on the role of the Canary, navigating personal as well as political struggles in a world rendered in stark monochrome.

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© Photograph: Humble Grove

© Photograph: Humble Grove

© Photograph: Humble Grove