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Article overview
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Many-Body Spin Echo | Thomas Engl
; Juan Diego Urbina
; Klaus Richter
; | Date: |
19 Sep 2014 | Abstract: | We report the prediction of a coherent many body echo in systems of
interacting fermions with spin-orbit coupling. The signal is given by the time
evolution of the transition probability between an initial many-body state and
its time-reversed version, after flipping of the spins at some intermediate
time $t$. Around the time $2t$ (and only then) the signal, which contrary to
its single-particle counterpart is not suppressed by interactions, differs from
its otherwise flat background, a hallmark signature of echo phenomena. In the
non-perturbative regime where interactions, spin-orbit coupling and kinetic
energy compete, the echo signal has a universal form, with a width which is
independent of the interaction strength, and with its amplitude and sign
depending on combinatorial relations between the total number of particles and
the number of spins that are flipped. As an interference effect, the many-body
spin echo is thus a universal signature of many-body coherence. | Source: | arXiv, 1409.5684 | Services: | Forum | Review | PDF | Favorites |
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