Volume 131, Number 3, August 2020
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||26 August 2020|
Harnessing currents of particles for spectroscopy in small-ring lattices with binary mixtures
Instituto de Física, Facultad de Física, Pontificia Universidad Católica de Chile - Casilla 306, Santiago, Chile
Received: 6 February 2020
Accepted: 6 July 2020
We propose a method to probe ground states with distinct properties in binary mixtures trapped in small-ring lattices. The technique exploits the nonequilibrium particle current behavior generated by a nonadiabatic change of the interaction between the species of the binary mixture. The analysis of the current fluctuations in the Fourier space reveals a correspondence between the frequency peaks and specific particle-hole excitations, thereby performing a many-body spectroscopy of the ground state of the system. We show, for a small system, that the read out of the frequency spectrum can be used to detect essential features of a pair superfluid quantum phase. Remarkably, large frequency shifts of the spectral peaks provide an indication of relevant differences between ground states located very near in the parameter space. This spectral behavior allows establishing a criterium to determine in experiments changes in the properties of the ground state in small systems.
PACS: 67.85.-d – Ultracold gases, trapped gases / 03.75.Mn – Multicomponent condensates; spinor condensates / 78.90.+t – Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter (restricted to new topics in section 78)
© 2020 EPLA
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