colorbar tick labels -string above and below, remove ticks

I am trying to reproduce the colorbar below for my chart.

Below is my current chart...

Below is my code for this, please can you advise?

figure()
set(gcf, 'color', 'w'); 
slopedelta_rolled=mean(mean_slope_txx_irr,3)-mean(mean_slope_txx_ctl,3);
temp = [deltatxx_theiry(:) slopedelta_rolled(:)];
temp(temp == 0) = NaN;
[Q,Qc] = hist3(temp,'Nbins',[100 100],'CDataMode','auto');
Qx = cell2mat(Qc(1));
Qy = cell2mat(Qc(2));
Q = Q';
Q = Q./trapz(Qy,trapz(Qx,Q,2));
surf(Qx,Qy,Q,'FaceColor','interp','EdgeColor','none')
xlim([-2.1 3.4])
ylim([-0.14 0.12])
grid off
set(gca, 'Fontsize', 12, 'Fontweight', 'Bold'); %added
ylabel('slope IRR - slope CTL [K yr^-^1]');
xlabel('mean IRR - mean CTL [K]');
cmap = jet(500);
cmap(1,:) = [1,1,1];
colormap(cmap);
h=colorbar;
set(h,'position',[.91 .34 .031 .475]) %[xposition yposition width height].
set(get(h,'ylabel'),'string','Point density'); 
set(h,'XTickLabel',{'Low',' ',' ',' ',' ','High',}); 
view(0,90)

Answer 1

[Voss]

f = figure();
set(gca(),'Visible','on');
n_colors = 64;
h = axes( ...
    'Parent',f, ...
    'Units','normalized', ...
    'Position',[0.91 0.34 0.022 0.475], ...
    'XTick',[], ...
    'YTick',[], ...
    'YAxisLocation','right', ...
    'XLim',[0 1], ...
    'YLim',[0 n_colors-1], ...
    'Visible','off');
surface( ...
    'Parent',h, ...
    'XData',[0 1], ...
    'YData',0:n_colors-1, ...
    'ZData',zeros(n_colors,2), ...
    'FaceColor','flat', ...
    'CData',permute(jet(n_colors),[1 3 2]), ...
    'EdgeColor','none')
text( ...
    'Parent',h, ...
    'Position',[0.5 0], ...
    'String','Low', ...
    'VerticalAlignment','top', ...
    'HorizontalAlignment','center', ...
    'FontName','NanumSquare', ...
    'FontSize',12, ...
    'FontWeight','bold');
text( ...
    'Parent',h, ...
    'Position',[0.5 n_colors], ...
    'String','High', ...
    'VerticalAlignment','bottom', ...
    'HorizontalAlignment','center', ...
    'FontName','NanumSquare', ...
    'FontSize',12, ...
    'FontWeight','bold');
text( ...
    'Parent',h, ...
    'Position',[1 n_colors/2], ...
    'VerticalAlignment','top', ...
    'HorizontalAlignment','center', ...
    'Rotation',90, ...
    'String','Point density', ...
    'FontName','NanumSquare', ...
    'FontSize',16, ...
    'FontWeight','bold');