Author(s): Alex Gómez Salvador, Pavel E. Dolgirev, Marios H. Michael, Albert Liu, Danica Pavicevic, Michael Fechner, Andrea Cavalleri, and Eugene DemlerThis paper presents a theoretical framework for two-dimensional terahertz spectroscopy (2DTS) of collective excitations in condensed matter systems. Focusing on the Josephson plasma resonance in layered...

Author(s): Kelian Lin, Zhizhong Zhang, Wentao Huang, Xueqiang Feng, Lei Chen, Jinkai Wang, Kun Zhang, Weisheng Zhao, and Yue ZhangMagnetic hopfions are a novel kind of topological solitons existing in three-dimensional (3D) magnets, including chiral magnets, frustrated magnets, and magnetic multilayers. Their rich dynamics is demonstrated to be promising...

Author(s): Gabriele Riva, Pina Romaniello, and J. Arjan BergerIn a recent letter [Riva et al., Phys. Rev. Lett. 131, 216401 (2023)] we presented the multichannel Dyson equation (MCDE), in which two or more many-body Green's functions are coupled. In this work we will give further details of the MCDE approach. In particular we will discuss (1) the derivation...

Author(s): Jack T. Eckstein, Hiroko Yokota, Neus Domingo, Gustau Catalan, Oktay Aktas, Michael A. Carpenter, and Ekhard K. H. SaljeDomain walls have distinct properties from the bulk, and tailoring them to suit the needs for device applications is critical. Tungsten trioxide, WO3, is of great interest for device applications that make use of domain...

Author(s): Ankang Zhu, Mengcheng Zhu, Yong Nie, Minglong Han, Liang Li, Xue Liu, Xuegang Chen, Yuyan Han, Wenshuai Gao, and Mingliang TianSpontaneous symmetry breaking in topological matter has emerged as a pivotal concept in describing phase transitions within condensed-matter physics. Of particular interest is the Berezinskii-Kosterlitz-Thouless (BKT)...

Author(s): Hongxu Luo and Sai LyuFor two-dimensional ferromagnetic semiconductors, robust ferromagnetic couplings and high Curie temperatures are highly desirable. The alloying strategy has been proposed to be able to strengthen ferromagnetic superexchange interactions and enhance Curie temperatures. This strategy has been applied … [Phys. Rev. B 110,...