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15 papers · 1 filter
On fibrations of Lie groupoids
Bohui Chen, Cheng-Yong Du, Yu Wang
As groupoids generalize groups, motivated by group extensions we consider a kind of fibrations of Lie groupoids, called locally topological product Lie groupoid fibrations with fib…
Quantum phase transitions in the spin-boson model without the counterrotating terms
Yan-Zhi Wang, Shu He, Liwei Duan +1
We study the spin-boson model without the counterrotating terms by a numerically exact method based on variational matrix product states. Surprisingly, the second-order quantum pha…
Spin torque nano-oscillators based on antiferromagnetic skyrmions
Laichuan Shen, Jing Xia, Guoping Zhao +5
Skyrmion-based spin torque nano-oscillators are potential next-generation microwave signal generators. However, ferromagnetic skyrmion-based spin torque nano-oscillators cannot rea…
On the Cheeger constant for distance-regular graphs
Jack Koolen, Greg Markowsky, Zhi Qiao
The Cheeger constant of a graph is the smallest possible ratio between the size of a subgraph and the size of its boundary. It is well known that this constant must be at least $\f…
Cat's cradle-like Dirac semimetals in layer groups with multiple screw axes: Application to 2D Borophene and Borophane
Xiaotong Fan, Dashuai Ma, Botao Fu +2
Recently, the crystal symmetry-protected topological semimetals have aroused extensive interests, especially for the nonsymmorphic symmetry-protected one. We list the possible nonm…
Dynamics of the antiferromagnetic skyrmion induced by a magnetic anisotropy gradient
Laichuan Shen, Jing Xia, Guoping Zhao +5
The dynamics of antiferromagnets is a current hot topic in condensed matter physics and spintronics. However, the dynamics of insulating antiferromagnets cannot be excited by an el…