Thermodynamic properties of the spin-1/2 ferromagnetic Heisenberg chain with long-range interactions

2008 ◽  
Vol 372 (22) ◽  
pp. 4086-4091 ◽  
Author(s):  
Jialiang Li ◽  
Shuguo Lei
Keyword(s):  
Thermodynamic Properties ◽  
Long Range ◽  
Heisenberg Chain ◽  
Long Range Interactions

scholarly journals From deconfined spinons to coherent magnons in an antiferromagnetic Heisenberg chain with long range interactions

2021 ◽  
Vol 10 (5) ◽  
Author(s):  
Luhang Yang ◽  
Adrian Feiguin
Keyword(s):  
Long Range ◽  
Bound States ◽  
Spin Dynamic ◽  
Dynamic Structure ◽  
Group Method ◽  
Spin Liquid ◽  
Heisenberg Chain ◽  
Density Matrix Renormalization ◽  
Long Range Interactions ◽  
Néel Order

We study the nature of the excitations of an antiferromagnetic (AFM) Heisenberg chain with staggered long range interactions using the time-dependent density matrix renormalization group method and by means of a multi-spinon approximation. The chain undergoes true symmetry breaking and develops long range order, transitioning from a gapless spin liquid to a gapless ordered AFM phase. The spin dynamic structure factor shows that the emergence of Néel order can be associated to the formation of bound states of spinons that become coherent magnons. The quasiparticle band leaks out from the two-spinon continuum that is pushed up to higher energies. Our physical picture is also supported by an analysis of the behavior of the excitations in real-time.

scholarly journals Structural Changes in the Acceptor Site of Photosystem II upon Ca2+/Sr2+ Exchange in the Mn4CaO5 Cluster Site and the Possible Long-Range Interactions

Biomolecules ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 371
Author(s):  
Koua
Keyword(s):  
Crystal Structure ◽  
Photosystem Ii ◽  
Long Range ◽  
Electron Acceptor ◽  
Structural Changes ◽  
Acceptor Site ◽  
Oxygen Evolving Complex ◽  
Long Range Interactions ◽  
Structural Perturbations ◽  
Oxygen Evolving

The Mn4CaO5 cluster site in the oxygen-evolving complex (OEC) of photosystem II (PSII) undergoes structural perturbations, such as those induced by Ca2+/Sr2+ exchanges or Ca/Mn removal. These changes have been known to induce long-range positive shifts (between +30 and +150 mV) in the redox potential of the primary quinone electron acceptor plastoquinone A (QA), which is located 40 Å from the OEC. To further investigate these effects, we reanalyzed the crystal structure of Sr-PSII resolved at 2.1 Å and compared it with the native Ca-PSII resolved at 1.9 Å. Here, we focus on the acceptor site and report the possible long-range interactions between the donor, Mn4Ca(Sr)O5 cluster, and acceptor sites.

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