- Current Students
Ph.D. student 2014-current
Research: thermal transport in disordered semiconductor and organic systems.
Discoveries: phonon transport in Si-Ge alloy nanowires is superdiffusive, causing the thermal conductivity to increase with the cube root of the nanowire’s length.
Arnab K. Majee
M.S. 2014-2016, Ph.D. 2016-current
Research: thermal and electronic transport in 2-d materials, including graphene and transition metal dichalcogenides (TMDCs) such as MoS2.
Discoveries: thermal conductivity in graphene nanoribbons diverges logarithmically with length up to 10 microns in length. Grain boundaries in MoS2 do not contribute significantly to electrical resistance, so polycrystalline MoS2 has nearly the same electrical conductivity as single-crystalline MoS2!
M.S. 2014-2016, Ph.D. Student 2016-current
Research: electronic transport and thermoelectricity in semiconductor nanostructures using the Wigner formalism.
Discoveries: quantum effects in semiconductor nanostructures can enhance the Seebeck coefficient.
Blue Waters UPEP intern 2014-2015, M.S. student 2015-current
Research: first principles methods for the calculation of phonon properties, including dispersion and phonon-phonon coupling. Their application to thermal properties of nanomembranes and 2-d materials under strain and across material heterointerfaces.
Discoveries: thermal conductivity in Si and Ge nanomembranes is anisotropic and thickness dependent. Cross-plane thermal conductivity is highly sensitive to strain, with compressive (tensile) strain increasing (decreasing) the conductivity across the membrane, while leaving the in-plane direction unchanged, thus boosting anisotropy.
M.S. student 2016-current
Research: thermoelectric properties of group IV alloys containing Sn (Si-Sn, Ge-Sn).
Haoxian (Justin) Lin
summer REU student, May-Aug. 2017
Research: electronic and vibrational properties of 2-dimensional materials from first principles.
M.S. student 2014-2016
Currently: Ph.D. candidate in Mechanical Engineering at UMass
Senior Thesis 2015-2016
Currently at Cornell University