Polarons in quantum chains with XY exchange and Dzyaloshinsky-Moriya interaction

Zheng-Da Hu, Qi-Liang He, Jing‐Bo Xu

Ning-Ju Hui, Yangyang Xu, Jicheng Wang +2 more

Nikolay N. Bogolubov, Nikolay N. Bogolubov

Jian Zhang, Bin Shao, Jian Zou +1 more

We study the state transfer of Bell states in a general XY spin chain using the Dzyaloshinsky—Moriya interaction. Two symmetries of fidelity with the anisotropy parameter are found. The maximum fidelity is shown to be significantly enhanced in cases of an odd number of sites. Enhancement of fidelity on a singlet state is greater than that on the other Bell states in such cases.

Frédéric Chevy

Aiping Zhang, Fuli Li

We consider a qubit symmetrically and transversely coupled to an XY spin chain with Dzyaloshinsky—Moriya (DM) interaction in the presence of a transverse magnetic field. An analytical expression for the geometric phase of the qubit is obtained in the weak coupling limit. We find that the modification of the geometrical phase induced by the spin chain environment is greatly enhanced by DM interaction in the weak coupling limit around the quantum phase transition point of the spin chain.