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We consider a novel system of two-component atomic Bose-Einstein condensatein a double-well potential. Based on the well-known two-mode approximation, wedemonstrate that there are obvious avoided level-crossings when bothinterspecies and intraspecies interactions of two species are increased. Thequantum dynamics of the system exhibits revised oscillating behaviors comparedwith a single component condensate. We also examine the entanglement of twospecies. Our numerical calculations show the onset of entanglement can besigned as a violation of Cauchy-Schwarz inequality of second-order crosscorrelation function. Consequently, we use Von Neumann entropy to quantity thedegree of entanglement

Avoided level-crossing, correlation and entanglement of two-component Bose–Einstein condensates in a double well