** Shares of Archer Materials AXE.AX rise as much as 32.1%
to A$0.515, their highest since Sept. 15, 2023
** Stock posts its biggest intraday gain since Feb. 23
** Chipmaker says co has reduced the size of its biochip
graphene field effect transistor significantly
** Adds delivery of the new miniature packaged chips is
anticipated in mid-2024
** About 2.4 mln shares change hands, compared with the
30-day average volume of 461,610
** Stock up 2.6% YTD as of last close
(Reporting by Aaditya Govind Rao in Bengaluru)
((Aaditya.govindrao@thomsonreuters.com;))