After spending two years as a postdoc at Rutgers University (1967-8) in the group of Bernie Serin, he returned to France. He was appointed as an associate professor at the University of Paris-Orsay (IUT). In 1971, Deutsche immigrated to Israel and joined the Department of Physics at Tel Aviv University, where he spent his entire career. He developed a new direction of research on experimental low-temperature physics, with particular emphasis on granular superconductors, disordered media, metal-insulator and superconductor-semiconductor transitions properties of thin superconducting films and Josephson junctions. He made contributions to the understanding of vortex dynamics in superconductors and the development of superconducting devices. In addition, he worked on granular and disordered materials with an emphasis on the phenomenon of percolation.