Shuyan Chai, Qian Wu, Ting Zhang, Guangping Zhang, Ying Dai, Baibiao Huang, and Yandong Ma
Phys. Rev. Applied 22, 024052 (2024) – Published 20 August 2024
Triferroic multiferroicity, with ferroelectricity, ferromagnetism, and ferroelasticity coexisting in a single phase, is an intriguing phenomenon with promising device applications. Despite their great fundamental and technological importance, triferroic multiferroics remain substantially unexplored—especially those of semiconducting character. This computational study predicts semiconducting triferroic multiferroicity in the layered van der Waals material -TiBr, with ferroelastic control of magnetization orientation and ferroelectric control of the absolute values of spin-polarization-density distributions, which is quite exciting.
Alexander Kang-Jun Toh, McCoy W. Lim, T.S. Suraj, Xiaoye Chen, Hang Khume Tan, Royston Lim, Xuan Min Cheng, Nelson Lim, Sherry Yap, Durgesh Kumar, S.N. Piramanayagam, Pin Ho, and Anjan Soumyanarayanan
Phys. Rev. Applied 22, 024036 (2024) – Published 12 August 2024
Matthias Raba, Sébastien Triqueneaux, James Butterworth, David Schmoranzer, Emilio Barria, Jérôme Debray, Guillaume Donnier-Valentin, Thibaut Gandit, Anne Gerardin, Johannes Goupy, Olivier Tissot, Eddy Collin, and Andrew Fefferman
Phys. Rev. Applied 22, 024027 (2024) – Published 9 August 2024
Nanomechanical resonators, nanoelectronic systems, amorphous solids, and dark matter searches have each been the subject of recent or proposed experiments at or below 1 mK, but achieving such low cryostat temperatures is challenging. The authors report the performance of an aluminum nuclear demagnetization refrigerator designed to facilitate access to microkelvin temperatures. They found the aluminum refrigerant is well-suited to continuous nuclear demagnetization refrigeration when its natural oxide layer is effectively removed in selected regions. These results will broaden the field of microkelvin physics, accelerating the rate of discovery and increasing its technological potential.
C.K. Safeer, Paul S. Keatley, Witold Skowroński, Jakub Mojsiejuk, Kay Yakushiji, Akio Fukushima, Shinji Yuasa, Daniel Bedau, Fèlix Casanova, Luis E. Hueso, Robert J. Hicken, Daniele Pinna, Gerrit van der Laan, and Thorsten Hesjedal
Phys. Rev. Applied 22, 024019 (2024) – Published 7 August 2024
Anthony D’Addario, Johnathan Kuan, Noah F. Opondo, Ozan Erturk, Tao Zhou, Sunil A. Bhave, Martin V. Holt, and Gregory D. Fuchs
Phys. Rev. Applied 22, 024016 (2024) – Published 7 August 2024
Bulk acoustic wave (BAW) resonators that generate dynamic lattice strain are important for applications such as filters, sensors, and quantum control, but there is a lack of measurements available to quantify the strain directly. This study uses stroboscopic X-ray diffraction microscopy with correlated optical measurements on an ensemble of nitrogen-vacancy center defects to measure the dynamic strain in a diamond BAW resonator. This unique approach allows for directly imaging BAW resonator strain to improve fabrication and performance and for directly measuring important parameters of quantum defects to improve quantum control.
Edward Butler-Caddle, K.D.G. Imalka Jayawardena, Anjana Wijesekara, Rebecca L. Milot, and James Lloyd-Hughes
Phys. Rev. Applied 22, 024013 (2024) – Published 6 August 2024
Perovskite solar cell performance is affected by the rate of charge-carrier transfer into the charge transport layers (CTLs) and interfacial recombination, but these are difficult to distinguish. This study distinguishes them using ultrafast spectroscopy combined with a charge-carrier dynamics model that includes the Coulombic forces arising from the selective extraction of charge carriers. The authors obtain extraction and interface recombination rate constants for three common CTLs and determine the perovskite’s ambipolar diffusivity. These results identify the performance-limiting properties, and could inform the design of superior materials that can be characterized with this method.
Phys. Rev. Applied 22, L021001 (2024) – Published 1 August 2024
The ability to simulate XY models of classical spins is rather important, since e.g. it is related to solving NP-hard optimization problems. This study uses a photonic simulator to realize XY Hamiltonians with arbitrary spin connections and coupling strengths. The key unit is an optical system for vector-matrix multiplication that can perform arbitrary transformations of complex matrices. The Berezinskii-Kosterlitz-Thouless transition and ground-state search of several XY models are demonstrated experimentally. Thus this Letter provides an effective alternative approach for investigating such models and solving continuous quadratic optimization problems with optical systems.
