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Article overview
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Clock shift in a strongly interacting two-dimensional Fermi gas | | Christian Langmack
; Marcus Barth
; Wilhelm Zwerger
; Eric Braaten
; | | Date: |
3 Nov 2011 | | Abstract: | We derive universal relations for the radio-frequency (rf) spectroscopy of a
two-dimensional Fermi gas consisting of two spin states with a resonant S-wave
interaction. The rf transition rate has a high-frequency tail that is
proportional to the contact and displays logarithmic scaling violations,
decreasing asymptotically like $1/(omega^2 ln^2 omega)$. Its coefficient is
proportional to $ln^2(a_{2D}’/a_{2D})$, where $a_{2D}$ and $a_{2D}’$ are the
2-dimensional scattering lengths associated with initial-state and final-state
interactions. The clock shift is proportional to the contact and to
$ln(a_{2D}’/a_{2D})$. If $|ln(a_{2D}’/a_{2D})| gg 1$, the clock shift arises
as a cancellation between much larger contributions proportional to
$ln^2(a_{2D}’/a_{2D})$ from bound-bound and bound-free rf transitions. | | Source: | arXiv, 1111.0999 | | Services: | Forum | Review | PDF | Favorites | |
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