Analytic solutions of the quantum two-state problem in terms of the double-, bi- and tri-confluent Heun functions

T. A. Shahverdyan, T. A. Ishkhanyan, A. E. Grigoryan +1

We derive five classes of quantum time-dependent two-state models solvable in terms of the double confluent Heun functions, five other classes solvable in terms of the biconfluent…