%0 Journal Article %T Resonance Tunneling in Double-Well Billiards with a Pointlike Scatterer %A Taksu Cheon %A T. Shigehara %J Physics %D 1996 %I arXiv %R 10.1016/S0375-9601(97)00119-9 %X The coherent tunneling phenomenon is investigated in rectangular billiards divided into two domains by a classically unclimbable potential barrier. We show that by placing a pointlike scatterer inside the billiard, we can control the occurrence and the rate of the resonance tunneling. The key role of the avoided crossing is stressed. Keywords: chaotic tunneling, quantum billiard, delta potential, diabolical degeneracy PACS: 3.65.-w, 4.30.Nk, 5.45.+b, 73.40.Gk %U http://arxiv.org/abs/chao-dyn/9612008v1