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1. Collective Spin-Light and Light-Mediated Spin-Spin Interactions in an Optical Cavity

   https://doi.org/10.1103/PRXQuantum.3.020308  

   Li, Zeyang; Braverman, Boris; Colombo, Simone; Shu, Chi; Kawasaki, Akio; Adiyatullin, Albert F.; Pedrozo-Peñafiel, Edwin; Mendez, Enrique; Vuletić, Vladan (April 2022, PRX Quantum)
2. An alternative formalism for modeling spin

   https://doi.org/10.1140/epjc/s10052-022-10652-y  

   Powers, Sam; Stojkovic, Dejan (August 2022, The European Physical Journal C)

   Abstract We present an alternative formalism for modeling spin. The ontological elements of this formalism are base-2 sequences of length n . The machinery necessary to model physics is then developed by considering correlations between base-2 sequences. Upon choosing a reference base-2 sequence, a relational system of numbers can be defined, which we interpret as quantum numbers. Based on the properties of these relational quantum numbers, the selection rules governing interacting spin systems are derived from first principles. A tool for calculating the associated probabilities, which are the squared Clebsch–Gordan coefficients in quantum mechanics, is also presented. The resulting model offers a vivid information theoretic picture of spin and interacting spin systems. Importantly, this model is developed without making any assumptions about the nature of space-time, which presents an interesting opportunity to study emergent space-time models. 

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3. String Phase in an Artificial Spin Ice

   https://doi.org/10.1038/s41467-021-26734-6  

   Zhang, Xiaoyu; Duzgun, Ayhan; Lao, Yuyang; Subzwari, Shayaan; Bingham, Nicholas S.; Sklenar, Joseph; Saglam, Hilal; Ramberger, Justin; Batley, Joseph T.; Watts, Justin D.; et al (December 2021, Nature Communications)

   Abstract One-dimensional strings of local excitations are a fascinating feature of the physical behavior of strongly correlated topological quantum matter. Here we study strings of local excitations in a classical system of interacting nanomagnets, the Santa Fe Ice geometry of artificial spin ice. We measured the moment configuration of the nanomagnets, both after annealing near the ferromagnetic Curie point and in a thermally dynamic state. While the Santa Fe Ice lattice structure is complex, we demonstrate that its disordered magnetic state is naturally described within a framework of emergent strings. We show experimentally that the string length follows a simple Boltzmann distribution with an energy scale that is associated with the system’s magnetic interactions and is consistent with theoretical predictions. The results demonstrate that string descriptions and associated topological characteristics are not unique to quantum models but can also provide a simplifying description of complex classical systems with non-trivial frustration. 

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4. Evidence for spin swapping in an antiferromagnet

   https://doi.org/10.1038/s41567-022-01608-w  

   Lin, Weiwei; He, Jiaming; Ma, Bowen; Matzelle, Matthew; Xu, Jinsong; Freeland, John; Choi, Yongseong; Haskel, Daniel; Barbiellini, Bernardo; Bansil, Arun; et al (July 2022, Nature Physics)
5. Writable spin wave nanochannels in an artificial-spin-ice-mediated ferromagnetic thin film

   https://doi.org/10.1063/5.0085455  

   Li, Jianhua; Xu, Wen-Bing; Yue, Wen-Cheng; Yuan, Zixiong; Gao, Tan; Wang, Ting-Ting; Xiao, Zhi-Li; Lyu, Yang-Yang; Li, Chong; Wang, Chenguang; et al (March 2022, Applied Physics Letters)

   Magnonics, which employs spin-waves to transmit and process information, is a promising venue for low-power data processing. One of the major challenges is the local control of the spin-wave propagation path. Here, we introduce the concept of writable magnonics by taking advantage of the highly flexible reconfigurability and rewritability of artificial spin ice systems. Using micromagnetic simulations, we show that globally switchable spin-wave propagation and locally writable spin-wave nanochannels can be realized in a ferromagnetic thin film underlying an artificial pinwheel spin ice. The rewritable magnonics enabled by reconfigurable spin wave nanochannels provides a unique setting to design programmable magnonic circuits and logic devices for ultra-low power applications. 

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