# Resources

## Publications

• ### New Relativistic Theory for Modified Newtonian Dynamics

Author(s): Constantinos Skordis and Tom Złośnik A cosmological model that doesn’t require dark matter has passed a major hurdle in matching observations from the cosmic microwave background. [Phys. Rev. Lett. 127, 161302] Published Fri Oct 15, 2021
• ### Electron Pulse Compression with Optical Beat Note

Author(s): Zhexin Zhao, Kenneth J. Leedle, Dylan S. Black, Olav Solgaard, Robert L. Byer, and Shanhui Fan The beat note generated by two near-infrared lasers can be used to compress an electron pulse with the duration of hundreds of optical cycles into a single density peak. [Phys. Rev. Lett. 127, 164802] Published Thu Oct 14, 2021
• ### Atomic Structure Optimization with Machine-Learning Enabled Interpolation between Chemical Elements

Author(s): Sami Kaappa, Casper Larsen, and Karsten Wedel Jacobsen A machine learning technique that includes interpolation between chemical elements provides an efficient means to identify likely candidates for minimum-energy bulk, surface, and cluster structures. [Phys. Rev. Lett. 127, 166001] Published Thu Oct 14, 2021
• ### Stretch-Induced Bending of Soft Ribbed Strips

Author(s): Emmanuel Siéfert, Nicolas Cattaud, Etienne Reyssat, Benoît Roman, and José Bico Patterning grooves into the surface of an elastic ribbon can cause the ribbon to curl into a tube shape when it is stretched. [Phys. Rev. Lett. 127, 168002] Published Thu Oct 14, 2021
• ### Improved Neutron Lifetime Measurement with $\mathrm{UCN}τ$

Author(s): F. M. Gonzalez et al. (UCNτ Collaboration) An improved version of a “bottle” experiment lets researchers lower the uncertainty on this important parameter—but a tantalizing discrepancy remains. [Phys. Rev. Lett. 127, 162501] Published Wed Oct 13, 2021
• ### Probing Magnetic Exchange Interactions with Helium

Author(s): C. Trainer, C. M. Yim, C. Heil, L. S. Farrar, V. Tsurkan, A. Loidl, and P. Wahl The presence of helium reduces the spin-polarization in a magnetic tunnel junction. Ejecting the helium through the application of a voltage reverses the effect, providing electrical control of spin polarization. [Phys. Rev. Lett. 127, 166803] Published Tue Oct 12, 2021
• ### Individual Barkhausen Pulses of Ferroelastic Nanodomains

Author(s): Reinis Ignatans, Dragan Damjanovic, and Vasiliki Tileli Researchers have visualized the nanoscale jumps in a ferroelectric’s polarization that are thought to play a key role in how well some ferroelectric devices function. [Phys. Rev. Lett. 127, 167601] Published Tue Oct 12, 2021