124
7 Summary and Future Outlook
that with the advent of new machines for generating and studying neutron-rich halo
nuclei, we can look forward to the observation of the effect predicted by Efimov long
ago.
A good amount of interest is also being currently witnessed in some attempts
[113], which explore the possibility for the occurrence of ‘super Efimov effect’
in condensed matter physics, thereby opening new vistas for universal few body
physics. The authors employ anisotropic Heisenberg model to show that collective excitations inducing two magnon resonances can result in the binding of three
magnons, the binding energy spectrum obeying the ‘doubly exponential scaling,’
i.e., E n ≈ exp(−2 exp(−3π n/4)). For this reason, it should, more appropriately, be
termed as a ‘second-generation’ Efimov effect.’ The authors in [113] also propose
several approaches to experimentally realize such an effect in quantum magnets.
Extending theoretically the ‘normal’ Efimov effect, which by itself, has only been
experimentally established in certain idealized situations, to the so-called secondgeneration Efimov effect and looking for its experimental realization appears, at this
stage, to be a far-fetched possibility.
7 Summary and Future Outlook
that with the advent of new machines for generating and studying neutron-rich halo
nuclei, we can look forward to the observation of the effect predicted by Efimov long
ago.
A good amount of interest is also being currently witnessed in some attempts
[113], which explore the possibility for the occurrence of ‘super Efimov effect’
in condensed matter physics, thereby opening new vistas for universal few body
physics. The authors employ anisotropic Heisenberg model to show that collective excitations inducing two magnon resonances can result in the binding of three
magnons, the binding energy spectrum obeying the ‘doubly exponential scaling,’
i.e., E n ≈ exp(−2 exp(−3π n/4)). For this reason, it should, more appropriately, be
termed as a ‘second-generation’ Efimov effect.’ The authors in [113] also propose
several approaches to experimentally realize such an effect in quantum magnets.
Extending theoretically the ‘normal’ Efimov effect, which by itself, has only been
experimentally established in certain idealized situations, to the so-called secondgeneration Efimov effect and looking for its experimental realization appears, at this
stage, to be a far-fetched possibility.