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Spectral function and fidelity susceptibility in quantum critical phenomena
In this paper, we derive a simple equality that relates the spectral function
and the fidelity susceptibility , i.e. with being
the half-width of the resonance peak in the spectral function. Since the
spectral function can be measured in experiments by the neutron scattering or
the angle-resolved photoemission spectroscopy(ARPES) technique, our equality
makes the fidelity susceptibility directly measurable in experiments.
Physically, our equality reveals also that the resonance peak in the spectral
function actually denotes a quantum criticality-like point at which the solid
state seemly undergoes a significant change.Comment: 5 pages, 2 figure
Force control for robotic knee surgery.
Imperial Users onl
Boundary energy of the open XXZ chain from new exact solutions
Bethe Ansatz solutions of the open spin-1/2 integrable XXZ quantum spin chain
at roots of unity with nondiagonal boundary terms containing two free boundary
parameters have recently been proposed. We use these solutions to compute the
boundary energy (surface energy) in the thermodynamic limit.Comment: 20 pages, LaTeX; amssymb, 3 figure
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