“…On the melt growth technique, the quality of single crystal is strongly affected by the melt convection [1,2]. The melt convection structure is governed by the simultaneously acting forces [3][4][5][6][7][8][9][10][11], i.e., buoyancy force [12], surface tension [13][14][15][16][17][18], crystal/crucible rotation [19] and so on. Therefore, melt convection control technique should be developed to obtain the high quality crystal.…”