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Št. zadetkov: 2
Phantom Bethe excitations and spin helix eigenstates in integrable periodic and open spin chains
Vladislav Popkov, Xin Zhang, Andreas Klümper
Izvirni znanstveni članek
Oznake: kvantna mehanika;quantum mechanics;
We demonstrate the existence of a special chiral “phantom” mode with some analogy to a Goldstone mode in the anisotropic quantum XXZ Heisenberg spin chain. The phantom excitations contribute zero energy to the eigenstate, but a finite fixed quantum of momentum $k_0$. The mode exists not due to symme ...
Leto: 2021 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Chiral eigenbases of the XX and XY quantum spin chains
Xin Zhang, Frank Göhmann, Andreas Klümper, Vladislav Popkov
Izvirni znanstveni članek
Oznake: kvantna mehanika;kvantne spinske verige;magnetizem;quantum mechanics;quantum spin chains;magnetism;
We calculate the values of observables in chiral eigenstates of the XX quantum spin chain that were introduced in previous work and compare the form of the result with the respective expressions obtained in the more familiar eigenbasis of states with fixed magnetization in the z direction. We carry ...
Leto: 2025 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Št. zadetkov: 2
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