Research areas for a PhD in Physics that may lead to strong industry R&D positions include Quantum Physics, particularly in optics, and fields like semiconductors, lasers, and optical design. Condensed matter physics, high energy physics, superconductivity, and certain quantum mechanics applications are also relevant to industry needs. General data science skills are increasingly valuable, with computational astrophysics and biophysics providing experience in managing large data sets applicable in tech and finance sectors. The discussion highlights the importance of reaching out to specific R&D departments for tailored advice. The original poster is seeking a PhD position in experimental physics and is facing challenges in South Korea, including funding and communication barriers.