Figure 1
From: Exploring structural phase transitions of ion crystals
(a) Schematic of our SET in top view, consisting of a central electrode, two rf electrodes and two outer segmented dc electrodes, where the rf electrodes, the central electrode and the gaps in between are of the same width of 500 μm. Each outer segmented electrode consists of five component electrodes, i.e., a middle electrode, two control electrodes and two end electrodes. The widths of the control electrodes and end electrodes in the segment are 1.5 mm and the middle electrode is 1 mm wide. The gap in the segmented electrodes is of 130 μm width. For understanding the potential of the SET, we label the electrodes from No. 1 to No. 13 and define 
, 
, 
and 
. 
is for the potential compensation. The inset presents the definitions of 
, 
, 
and 
in Eq. (1) for the ith electrode. (b) The parameter 
varying with the values of VME applied on the middle electrodes. Inset: the corresponding trap frequencies in variation with VME. We have assumed a perfect compensation in this case (See details in Supplementary Information).
