171 citations · 2.1k across the 111 of their papers we have counts for
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Structure and scaling of Kitaev chain across a quantum critical point in real space
Yan He, Chih-Chun Chien
The spatial Kibble-Zurek mechanism (KZM) is applied to the Kitaev chain with inhomogeneous pairing interactions that vanish in half of the lattice and result in a quantum critical…
Re-entrant Fulde-Ferrell-Larkin-Ovchinnikov State in Small-Sized Superconductors
Tom Kim, Chih-Chun Chien, Shi-Zeng Lin
We study the effect of a parallel magnetic field in a thin and small superconductor. The field suppresses superconductivity through Zeeman coupling while stabilizes the Fulde-Ferre…
BCS thermal vacuum of fermionic superfluids and its perturbation theory
Xu-Yang Hou, Ziwen Huang, Hao Guo +2
The thermal field theory is applied to fermionic superfluids by doubling the degrees of freedom of the BCS theory. We construct the two-mode states and the corresponding Bogoliubov…
Superconducting circuit simulator of Bose-Hubbard model with a flat band
Xiu-Hao Deng, Chen-Yen Lai, Chih-Chun Chien
Recent advance in quantum simulations of interacting photons using superconducting circuits offers opportunities for investigating the Bose-Hubbard model in various geometries with…
Site-wise manipulations and Mott insulator-superfluid transition of interacting photons using superconducting circuit simulators
Xiuhao Deng, Chunjing Jia, Chih-Chun Chien
The Bose Hubbard model (BHM) of interacting bosons in a lattice has been a paradigm in many-body physics, and it exhibits a Mott insulator (MI)-superfluid (SF) transition at intege…
Theories of Linear Response in BCS Superfluids and How They Meet Fundamental Constraints
Hao Guo, Chih-Chun Chien, Yan He
We address the importance of symmetry and symmetry breaking on linear response theories of fermionic BCS superfluids. The linear theory of a noninteracting Fermi gas is reviewed an…