Rotating the double well with controlling the RF polarization.
From now on we started to use a different wire setup on the atom chip (see below), which allows the application of two independent orthogonal RF fields. In this configuration we can now apply an arbitrary RF-polarization. This allows much more freedom to design the potentials.
As a first demonstration we show that the orientation of the double well depends on the orientation of the RF polarization. We create a linear RF polarization by adjusting the phase between the RF to 0 (?). Changing the relative amplitude allows then to rotate the polarization. The observed double well rotates accordingly. To observe stable interference fringes one has to compensate for gravity which can be accomplished easily by shifting the height of the trap by a few µm.
