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We perform the detailed study of the tetraquark (4Q) potential $V_{\rm 4Q}$for various QQ-$\rm \bar{Q}\bar{Q}$ systems in SU(3) lattice QCD with$\beta=6.0$ and $16^3 \times 32$ at the quenched level. For about 200 differentpatterns of 4Q systems, $V_{\rm 4Q}$ is extracted from the 4Q Wilson loop in300 gauge configurations, with the smearing method to enhance the ground-statecomponent. We calculate $V_{\rm 4Q}$ for planar, twisted, asymmetric, andlarge-size 4Q configurations, respectively. Here, the calculation forlarge-size 4Q configurations is done by identifying $16^2 \times 32$ as thespatial size and 16 as the temporal one, and the long-distance confinementforce is particularly analyzed in terms of the flux-tube picture. When QQ and$\rm \bar{Q}\bar{Q}$ are well separated, $V_{\rm 4Q}$ is found to be expressedas the sum of the one-gluon-exchange Coulomb term and multi-Y type linear termbased on the flux-tube picture. When the nearest quark and antiquark pair isspatially close, the system is described as a "two-meson" state. We observe aflux-tube recombination called as "flip-flop" between the connected 4Q stateand the "two-meson" state around the level-crossing point. This leads toinfrared screening of the long-range color forces between (anti)quarksbelonging to different mesons, and results in the absence of the color van derWaals force between two mesons.Comment: 17 pages, 23 figure

Detailed analysis of the tetraquark potential and flip-flop in SU(3) lattice QCD