  Coupling a two-terminal Josephson junction to the stationary modes of the
electromagnetic field produces the so-called Fiske resonances. Here, we propose
another mechanism based on the exchange between the static Andreev bound states
(ABS) and a nonequilibrium Fermi surface in an ultraclean multiterminal device.
As a simple model, we consider an effective $S_a$-$N_{eff}$-$S_b$ double
junction connecting the superconductors $S_a$ and $S_b$ to the infinite central
normal metal $N_{eff}$. We find that the underlying microscopic process of
phase-sensitive Andreev reflection (phase-AR) produces the possibility of an
inversion, that is, the conductance can be larger at half-flux quantum than in
zero field. The inversion-noninversion alternate as the bias voltage is
increased. In addition, if the central region $N_{eff}$ is an integrable
billiard connected to an infinite normal reservoir, we find that the standard
ABS are replaced by one- and two-particle Andreev resonances that can be probed
by the bias voltage. Finally, we find that, in the corresponding
all-superconducting Andreev interferometer, the superconducting gap produces
protection against the short relaxation time of the quasiparticle continua if
the time periodic dynamics is treated as a perturbation. The spectrum of the
two-particle resonances is then sparse inside the spectrum of the pairs of
one-particle resonances. Our work supports the nonFloquet intrinsic resonances
in two-dimensional metal-based Andreev interferometers, and challenges the
Floquet theory of multiterminal Josephson junctions.
