I joined Columbia University in 2001 as an Associate Professor after having worked for 2 years at University of California at Berkeley as a Miller Research Fellow. I received a Ph.D. in Applied Physics from Harvard University in 1999. My research area is experimental condensed matter physics with an emphasis on physical properties and applications of nanoscale low-dimensional materials. The recent availability of novel nanoscale materials, such as fullerenes, carbon nanotubes, nanowires, and nanocrystals, is enabling the assembly and study of ‘molecular’ electronics and mechanical devices, and also, the exploration of fundamental physics in low-dimensional systems. These progresses have been made possible partly due to invention of new experimental tools, such as scanning probe microscopy (SPM), and the advance of semiconductor device technology including techniques for microelectromechanical systems (MEMS). Combining these new experimental techniques to nanoscale materials produce an ample space to explore the new physical phenomena, which may bring an impact to future technologies. We are investigating the mesoscopic electrical and thermal transport phenomena in 1-d nanomaterials such as carbon nanotubes and semiconducting nanowires. To study these materials at a single nanowire level we use a hybrid approach of semiconducting device microfabrication technologies including MEMS technique and new material synthesis methods. We also study a novel 2-d nanostructures. Many peculiar physical phenomena, such as strong electron correlation, charge density wave formation, and even high temperature superconductivity, arise from 2-dimensional electronic system in various layered materials. If small pieces of single atomic sheet of layered materials, such as graphite, metal-dichalcogenides, and high temperature superconductors, could be extracted from their host crystals, they should serve as a new 2-d confining box for electrons, which will provide a rich physics that one cannot access in bulk materials. We investigate the electronic and thermal properties of these novel 2-d nanocrystals using combined SPM and microfabrication technique. The new nanotechnology, utilizing nanoscale materials and developing new fabrication techniques on nanoscales, is essential for future device applications. We develop new nano electromechanical systems (NEMS) using carbon nanotubes combining with MEMS technology, and study their mechanical properties as well as the possible device applications.