个人简介

B.A. (Carleton College, 1992) Ph.D. (University of Texas at Austin, 1998) Postdoctoral Research Associate (University of Texas at Austin, 1999-2001)

研究领域

Chemical Physics Materials Chemistry

The semiconductor quantum dot is arguably “The” central material in the nanoscience revolution. The quantum dot is a nanoscale semiconductor, placing itself both literally and conceptually between the microscopic molecular limits traditionally studied by chemists and the macroscopic bulk limit studied by physicists. In this intermediate regime of size and quantum mechanics, the quantum dot is also referred to as an artificial atom. This situation presents a rich playground for investigating the basic science which is at the heart of nanoscience, as well as rationally applying these fundamental results to develop possibly disruptive technologies. One of the main areas of impact of these quantum dots is on our energy future. Quantum dots have already shown considerable promise for advanced photovoltaics which may enable us to develop greener energy sources. In addition to their role on the “supply side” of the energy problem, these materials also offer value on the “demand side”. Quantum dots are excellent light emitters and can be developed into energy efficient sources of room lighting – one of our largest energy drains. In addition to addressing our needs for sustainable energy, the unique physics and chemistry of quantum dots may be exploited for advanced devices ranging from nano-lasers to sensors, and possibly transistors for light. In order to explore the basic science of quantum dots, we develop and implement sophisticated laser spectroscopies to interrogate these materials in real time. With electronic and nuclear motion taking place on very fast timescales, we use an even faster “camera” – a femtosecond laser – to freeze out these motions and watch the ways in which these systems behave. In our lab, we use lasers that produce pulses of 10 femtoseconds (10 millionth of a billionth of a second) in duration. We can control these laser pulses so as to enable a wide variety of state-of-the-art spectroscopies to be performed on these quantum dots. In addition to developing the laser based techniques by which we establish our understanding of these materials, we exploit our understanding of the basic science to develop optical and electronic devices that aim to meet emergent societal needs enabled by semiconductor quantum dots.

近期论文

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“Progress towards rational control of the surface emission from semiconductor nanocrystals P. Kambhampati, Phys. Chem. Chem. Phys., Invited, (2014) “On the surface of semiconductor nanocrystals: From hot carrier surface trapping to control of light emission.”, P. Kambhampati, Chem. Phys., Invited, (2014) “Connecting the Dots: the Kinetics and Thermodynamics of Hot, Cold, and Surface Trapped Excitons in Semiconductor Nanocrystals”, J. Mooney, M. Krause, and P. Kambhampati, J. Phys. Chem. Lett., 118, 7730 (2014). “Control of phonons in semiconductor quantum dots via femtosecond pulse chirp-influenced wavepacket dynamics and polarization”, J. Mooney, J. Saari, A.M. Kelley, M.M. Krause, and P. Kambhampati, J. Phys. Chem. B, 117, 15651 (2013) “Spectral and spatial contributions to white light generation from InGaN/GaN dot-in-a-wire nanostructures”, Y. Kamali, B.R. Walsh, J.D. Mooney, H. Nguyen, C. Brosseau, R. Leonelli, Z. Mi, and P. Kambhampati, J. Appl. Phys., 114, 136305 (2013). “Get the Basics Right: Jacobian Conversion of Wavelength and Energy Scales for Quantitative Analysis of Emission Spectra”, J. Mooney and P. Kambhampati, J. Phys. Chem. Lett., 4, 3316 (2013) “A microscopic picture of surface charge trapping in semiconductor nanocrystals”, J. Mooney, M. Krause, J. Saari, and P. Kambhampati, J. Chem. Phys, 138, 204705 (2013). “Wavefunction Engineering of the Surface of Semiconductor Nanocrystals for Designer White Light Emitters”, M. Krause, J. Mooney, and P. Kambhampati, ACS Nano, 7, 5922 (2013). “Two-color two-dimensional electronic spectroscopy using dual acousto-optic pulse shapers for complete amplitude, phase, and polarization control of femtosecond laser pulses.”, P. Tyagi, J.I. Saari, B.R. Walsh, A. Kabir, V. Crozatier, N. Forget, and P. Kambhampati1, J. Phys. Chem. A, (2013) “Terahertz bandwidth all-optical modulation and logic using multiexcitons in semiconductor nanocrystals”, J. Saari, M. Krause, B. Walsh, and P. Kambhampati, Nano Lett, (2013). “Challenge to the deep-trap model of the surface in semiconductor nanocrystals”, J. Mooney, M. Krause, J. Saari, and P. Kambhampati, Phys. Rev. B (Rapid Communication), (2013). “Ultrafast Electron Trapping at the Surface of Semiconductor Nanocrystals: Excitonic and Biexcitonic Processes”, J.I. Saari, E.A. Dias, D. Reifsnyder, M.M. Krause, B.R. Walsh, C.B. Murray, and Patanjali Kambhampati, J. Phys. Chem. B, In Press (2013)