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Excitation of bond-alternating spin-1/2 Heisenberg chains by tunnelling electrons

AutorGauyacq, J. P.; Lorente, Nicolás
Palabras claveHeisenberg chain
Magnetic excitations
Fecha de publicación2014
EditorInstitute of Physics Publishing
CitaciónJournal of Physics: Condensed Matter 26(39): 394005 (2014)
ResumenInelastic electron tunneling spectra (IETS) are evaluated for spin-1/2 Heisenberg chains showing different phases of their spin ordering. The spin ordering is controlled by the value of the two different Heisenberg couplings on the two sides of each of the chain's atoms (bond-alternating chains). The perfect anti-ferromagnetic phase, i.e. a unique exchange coupling, marks a topological quantum phase transition (TQPT) of the bond-alternating chain. Our calculations show that the TQPT is recognizable in the excited states of the chain and hence that IETS is in principle capable of discriminating the phases. We show that perfectly symmetric chains, such as closed rings mimicking infinite chains, yield the same spectra on both sides of the TQPT and IETS cannot reveal the nature of the spin phase. However, for finite size open chains, both sides of the TQPT are associated with different IETS spectra, especially on the edge atoms, thus outlining the transition.
Identificadoresdoi: 10.1088/0953-8984/26/39/394005
e-issn: 1361-648X
issn: 0953-8984
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