Quantum path control on the harmonic emission in the presence of a terahertz field

► A model Ne atom exposed to a combined field. ► Single quantum path selection with the terahertz controlling field. ► Formation of a 656 eV supercontiumm band with less modulations. ► Generation of 38 as single isolated attosecond pulse. ► Analysis of time-dependent Schrödinger equation and of time-frequency.