Progress in acoustic measurements and geoacoustic applications
Geoacoustic exploration is a rapidly evolving field investigating underground rock formations and sediment environments through acoustic waves. In this paper, we present a review of recent research progress, focusing on newly discovered physical phenomena, such as the reflection and refraction of acoustic waves at the interface between anisotropic rocks and between liquid and solid, the characteristics of electric-acoustic (and acoustic-electric) conversion of piezoelectric transducers
Lin Fa, Huiting Yang, Yuxiao Fa, Shuangshuang Meng, Jurong Bai, Yandong Zhang, Xiangrong Fang, Xiao Zou, Xinhao Cui, Yanli Wang & Meishan Zhao
Encircling the Liouvillian exceptional points: a brief review
Exceptional points are the branch-point singularities of non-Hermitian Hamiltonians and have rich consequences in open-system dynamics. While the exceptional points and their critical phenomena are widely studied in the non-Hermitian settings without quantum jumps, they also emerge in open quantum systems depicted by the Lindblad master equations, wherein they are identified as the degeneracies in the Liouvillian eigenspectrum. These Liouvillian exceptional points often have distinct p
Konghao Sun & Wei Yi
Density functional theory study of two-dimensional hybrid organic-inorganic perovskites: frontier level alignment and chirality-induced spin splitting
Perovskites are a class of semiconductors initially recognized for their exceptional efficiency in solar cell applications. Subsequent research has revealed their diverse and attractive optoelectronic properties. Over the last decades, molecule-level engineering attempts toward the original three-dimensional (“3D”) perovskites have led to the emergence of two-dimensional (“2D”) layered crystals and introduced extensive compositional, structural, and electronic tunability through the in
Ruyi Song & Rundong Zhao
Environment-induced information scrambling transition with charge conservations
In generic closed quantum systems, the complexity of operators increases under time evolution governed by the Heisenberg equation, reflecting the scrambling of local quantum information. However, when systems interact with an external environment, the system-environment coupling allows operators to escape from the system, inducing a dynamical transition between the scrambling phase and the dissipative phase. This transition is known as the environment-induced information scrambling tra
Pengfei Zhang & Zhenhua Yu
The developments in carbon-modified graphitic carbon nitride for photoelectrochemical water splitting: a mini review
Graphitic carbon nitride (g-CN), as a potential photoelectrode for photoelectrochemical water splitting, has garnered significant research attention owing to its favorable attributes, including a suitable bandgap, abundant elemental composition, excellent thermal stability, and non-toxicity. However, the limited efficiency of visible light absorption and poor electrical conductivity of pure g-CN result in low photocurrent density and photocatalytic activity, falling short of meeting th
Yuewen Yang, Tingrui Xu & Ruiqin Zhang
Surface and bulk acoustic wave resonators based on aluminum nitride for bandpass filters
Bandpass filters with high frequency and wide bandwidth are indispensable parts of the fifth-generation telecommunication technologies, and currently, they are mainly based on surface and bulk acoustic wave resonators. Owing to its high mechanical strength, excellent stability at elevated temperatures, good thermal conductivity, and compatibility with complementary metal-oxide-semiconductor technology, aluminum nitride (AlN) becomes the primary piezoelectric material for high-frequency
Xian-Hu Zha, Jing-Ting Luo, Ran Tao & Chen Fu
A newly developed Cu(Rh) alloy film and its characteristics and applications
A new type of copper (Cu)-rhodium (Rh)-alloy, Cu(Rh), films is developed by co-sputtering copper and rhodium onto silicon (Si) substrates under an argon (Ar) atmosphere. The new films are next annealed at 600 and 670 °C, or alternatively at 100 and 450 °C, for 1 h. Longer annealing to the films, for up to 8 days, is also conducted to explore resistivity variation. The resistivity of the new 300-nm-thick film is 2.19 μΩ cm after annealing at 670 °C for 1 h and drifts to 2.26 and 2.14 μΩ
Chon-Hsin Lin
A quantum algorithm for linear differential equations with layerwise parameterized quantum circuits
Solving linear differential equations is a common problem in almost all fields of science and engineering. Here, we present a variational algorithm with shallow circuits for solving such a problem: given an \(N \times N\) matrix \({\boldsymbol{A}}\), an N-dimensional vector \(\boldsymbol{b}\), and an initial vector \(\boldsymbol{x}(0)\), how to obtain the solution vector \(\boldsymbol{x}(T)\) at time T according to the constraint \(\textrm{d}\boldsymbol{x}(t)/\textrm{d} t = {\boldsymbo
Junxiang Xiao, Jingwei Wen, Zengrong Zhou, Ling Qian, Zhiguo Huang, Shijie Wei & Guilu Long
The study of angular distance distribution to the solar flares during different solar cycles
The angular distance of the solar flares to the projective point of the center of the solar disk on the solar spherical surface has been studied by the heliographical or helioprojective coordinates, during the periods 1975–2021 for GOES events and 2002–2021 for RHESSI events, hereafter “distance.” It gives a specific distribution curvature. It has also been noted that when using the number of solar flare events in each satellite, GOES or RHESSI, or even using the sum of the flux (class
Ramy Mawad
Intersections of ultracold atomic polarons and nuclear clusters: how is a chart of nuclides modified in dilute neutron matter?
Neutron star observations, as well as experiments on neutron-rich nuclei, used to motivate one to look at degenerate nuclear matter from its extreme, namely, pure neutron matter. As an important next step, impurities and clusters in dilute neutron matter have attracted special attention. In this paper, we review in-medium properties of these objects on the basis of the physics of polarons, which have been recently realized in ultracold atomic experiments. We discuss how such atomic and
Hiroyuki Tajima, Hajime Moriya, Wataru Horiuchi, Eiji Nakano & Kei Iida