Kim and coworkers have made important contributions in the field of
nanoscale low-dimensional materials. In 1999, he and Lieber published a highly cited paper on electrostatically controlled carbon nanotube
NEMS devices. In February 2005, his group at Columbia reported electrical measurements of thin graphite films produced by an
atomic force microscope technique. In September 2005, they reported observation of the
quantum Hall effect in single graphene layers simultaneously with the group of
Andre Geim, and in 2007, the two groups jointly published observations of the quantum Hall effect in graphene at
room temperature. Kim's group authored an influential paper in 2007 describing a transport gap introduced by
lithographic patterning of graphene to form
nanoribbons. This was an important proof of principle in the development of graphene electronics as it allowed on-off switching of the graphene devices by a factor of 1000 at low temperature. In February 2009, his group and coworkers have synthesized the large-scale graphene films by CVD method. He indicated that the quality of CVD-grown graphene is comparable to that of mechanically cleaved graphene, as observation of the half-integer quantum Hall effect in CVD-grown graphene. The group reported observation of the
fractional quantum Hall effect in suspended graphene in November 2009. ==Honors and awards==