Department of Physics and Astronomy
The University of Kansas
Office: 2063 Malott, Tel: 785-864-1938
Lab: 1072 Malott, Tel: 785-864-1237
Email: huizhao@ku.edu

• EMPLOYMENTS

August 2007 - Assistant Professor, Department of Physics and Astronomy, The University of Kansas.
August 2003 – August 2007, Postdoc, Lab for Photonics and Quantum Electronics, The University of Iowa.
April 2000 – January 2003, Postdoc, Institut fuer Angewandate Physik, Universitaet Karlsruhe, Germany.

• EDUCATION

Ph.D. (2000), M.S. (1997), B.Eng (1994), all from Beijing Jiaotong University, Beijing, China.

• TEACHING

Fall 2009: PHSX 531 Electricity and Magnetism
Spring 2009: PHSX 987 Applied Physics Seminar
Spring 2009: PHSX 212 General Physics II
Fall 2008: PHSX 531 Electricity and Magnetism.
Fall 2008: PHSX 717 Graduate Seminar.
Fall 2008: PHSX 987 Applied Physics Seminar.
Fall 2007: PHSX 211 General Physics I (Discussion).

• MEMBERSHIPS

Member of American Physical Society (APS) since 2003.

• JOURNAL REFEREE SERVICES

Applied Physics Letters, Applied Surface Science, Journal of Applied Physics, Journal of Physics A
Journal of Physics: Condensed Matters, Journal of Physics D, Materials Chemistry and Physics
Measurements, Nanotechnology, New Journal of Physics, Physica B, Physica Status Solidi, Physics Letters A
Physical Review A, Physical Review B, Physical Review Letters, Semiconductor Science and Technology


• PUBLICATIONS

  Journal Papers

1. E.J. Loren, B.A. Ruzicka, L.K. Werake, Hui Zhao, H.M. van Driel, and A.L.Smirl, Optical injection and detection of ballistic pure spin currents in Ge. Applied Physics Letters, submitted (2009).
2. B.A. Ruzicka and Hui Zhao, Power dependence of pure spin current injection by quantum interference. Physical Review B 79, 155204 (2009).[Full text]
3. Hui Zhao, M. Mower, and G. Vignale, Ambipolar spin diffusion and Dyakonov-Perel spin relaxation in GaAs quantum wells. Physical Review B 79, 115321 (2009).[Full text]
4. B.A. Ruzicka, K. Higley, L.K. Werake, and Hui Zhao, All-optical generation and detection of subpicosecond ac spin-current pulses in GaAs, Physical Review B 78, 045314 (2008).[Full text] [Editor's Suggestion]
5. Hui Zhao, Temperature dependence of ambipolar diffusion in silicon-on-insulator, Applied Physics Letters 92, 112104 (2008).[Full text, @AIP]
6. Hui Zhao, E.J. Loren, A.L. Smirl, and H.M. van Driel, Dynamics of charge current injected in GaAs by quantum interference, Journal of Applied Physics 103, 053510 (2008).[Full text, ©AIP].
7. Hui Zhao, A.L. Smirl, and H.M. van Driel, Temporally and spatially resolved ballistic pure spin transport, Physical Review B 75, 075305 (2007). [Full text, ©APS].
8. Hui Zhao, E.J. Loren, H.M. van Driel, and A.L. Smirl, Coherence control of Hall charge and spin currents, Physical Review Letters 96, 246601 (2006). [Full text, ©APS].
9. Hui Zhao, X.Y. Pan, A.L. Smirl, R.D.R. Bhat, A. Najmaie, J.E. Sipe, and H.M. van Driel, Injection of ballistic pure spin currents in semiconductors by a single-color linearly-polarized beam, Physical Review B 72, 201302(R) (2005). [Full text, ©APS].
10. Hui Zhao, B. Dal Don, G. Schwartz, and H. Kalt, Ultrafast breathing-like oscillation in the exciton density of ZnSe quantum wells, Physical Review Letters 94, 137402 (2005). [Full text, ©APS].
11. Hui Zhao and H. Kalt, Direct measurement of acoustic-phonon scattering of hot quantum-well excitons, Physical Review B 69, 233305 (2004). [Full text, ©APS].
12. Hui Zhao and H. Kalt, Energy dependent Huang-Rhys factor of free excitons, Physical Review B 68, 125309 (2003). [Full text, ©APS].
13. S. Moehl, Hui Zhao, B. Dal Don, S. Wachter and H. Kalt, Solid-immersion-lens-enhanced nano-photoluminescence: principle and application, Journal of Applied Physics 93, 6265 (2003). [Full text, ©AIP].
14. Hui Zhao, B. Dal Don, S. Moehl, H. Kalt, K. Ohkawa and D. Hommel, Spatio-temporal dynamics of quantum-well excitons, Physical Review B  67, 035306 (2003). [Full text, ©APS].
15. Hui Zhao, S. Moehl, and H. Kalt, Energy relaxation during hot-exciton transport in quantum wells, Applied Physics Letters 81, 2794 (2002). [Full text, ©AIP].
16. Hui Zhao, S. Wachter, and H. Kalt, Effect of quantum confinement on exciton-phonon interactions, Physical Review B 66, 085337 (2002). [Full text, ©APS].
17. Hui Zhao, S. Moehl, and H. Kalt, Coherence length of excitons in a semiconductor quantum well, Physical Review Letters 89, 097401 (2002). [Full text, ©APS].
18. Hui Zhao, S. Moehl, S. Wachter, and H. Kalt, Hot exciton transport in ZnSe quantum wells, Applied Physics Letters 80, 1391 (2002). [Full text, ©AIP].

Book Chapters   

1. Hui Zhao and H. Kalt, Hot excitons in ZnSe quantum wells, in Optics of Semiconductors and their Nanostructures, H. Kalt and M. Hetterich, Eds. Springer Series in Solid-State Sciences, Vol. 146, Published by Springer-Verlag (2004).

Media Coverage

1. Lens enhances resolution, Research News in Materials Today 6, issue 7/8, p.14, (2003).

Colloquium/Seminar Talks

1. Nanoscale electronic transport in semiconductors studied by femtosecond laser techniques, Colloquium, Department of Physics, Astronomy and Material Science, Missouri State University, USA (04/2009).
2. Nanoscale spin and charge transport studied by ultrafast laser techniques, Colloquium, School of Science, Beijing Jiaotong University, China (04/2008).
3. Nanoscale ballistic transport studied by ultrafast laser techniques, Seminar, Institute of Semiconductors, Chinese Academy of Science, China (04/2008).
4. Nanoscale ballistic transport studied by ultrafast laser techniques, Seminar, Institute of Physics, Chinese Academy of Science, China (04/2008).
5. Optical pump-probe techniques, Seminar, Department of Physics and Astronomy, University of Oklahoma, USA (01/2008).
6. Nanoscale ballistic charge and spin transport studied by Optical techniques, Colloquium, Department of Physics and Astronomy, University of Oklahoma, USA (01/2008).
7. Nanoscale ballistic charge and spin transport studied by ultrafast laser techniques, Colloquium, Department of Physics and Astronomy, University of Missouri at Columbia, USA (12/2007).
8. Optical Studies of Ballistic charge and spin transport in semiconductors, Colloquium, Department of Physics, University of Missouri at Kansas City, USA (12/2007).
9. Nanoscale ballistic charge and spin transport in semiconductors, Seminar, Department of Chemistry, University of Kansas, USA (10/2007).
10. Real-space observations of nanoscale spin and charge transport in semiconductors by optical techniques, Colloquium, Department of Physics and Astronomy, University of Kansas, USA (04/2007).
11. Real-space observations of ballistic spin and charge transport in semiconductors by optical techniques, Seminar, Department of Physics, Tulane University, USA (03/2007).
12. Non-diffusive transport of excitons in quantum wells, Seminar, Institute of Applied Physics, University of Karlsruhe, Germany (06/2002).
13. Spatiotemporal dynamics and quantum-well excitons, Seminar, Institute of Applied Physics, University of Karlsruhe, Germany (01/2002).
14. Monte-Carlo simulation of electronic transport in ZnS, Seminar, Institute of Applied Physics, University of Karlsruhe, Germany (06/2000).
    

Invited Conference Presentations

1. Hui Zhao and A.L. Smirl, Optical studies of ballistic pure spin transport, 54th midwest Solid State Conference (2007).
2. A.L. Smirl, Hui Zhao, E.J. Loren, H.M. van Driel, Quantum interference goes ballistic: the dynamics of spin and charge currents, FOPS'2007.
3. A.L. Smirl, Hui Zhao, E.J. Loren, and H.M. van Driel, All-optical generation and coherent control of spin Hall currents, NOEKS-8 (2006).
4. H. Kalt, Hui Zhao, B. Dal Don, G. Schwartz, C. Bradford, and K. Prior, Quasi-ballistic transport of excitons in quantum wells, EXCON'2004.

Contributed Conference Presentations (CLEO/QELS)

• 2009 (Oral) Hui Zhao, Ambipolar diffusion in silicon-on-insulator studied by opitcal pump-probe based on free carrier absorption.
• 2009 (Oral) A.L. Smirl, E.J. Loren, B.A. Ruzicka, L.K. Werake, Hui Zhao, and H.M. van Driel, All-optical injection, control, and detection of ballistic spin and charge currents in group IV semiconductors.
• 2009 (Poster) B.A. Ruzicka, L.K. Werake, Hui Zhao, M. Mover, and G. Vignale, Spin-polarized electron transport in GaAs: Role of holes.
• 2008 (Oral) A. L. Smirl, Hui Zhao, E. J. Loren and H. M. van Driel, All-optical injection, control and detection of ballistic charge transport in semiconductors.
• 2007 (Oral) Hui Zhao, A. L. Smirl, and H. M. van Driel, Spatialtemporal resolution of ballistic pure spin transport in semiconductors.
• 2006 (Oral) Hui Zhao, Eric J. Loren, H. M. van Driel, and Arthur L. Smirl, Quantum interference generation and control of ballistic charge and spin Hall currents.
• 2005 (Oral, postdeadline) Hui Zhao, Xinyu Pan, Arthur L. Smirl, R. D. R. Bhat, Ali Najmaie, J. E. Sipe, and H. M. van Driel, Injection of ballistic pure spin currents in semiconductors by a single-color linearly polarized beam.
• 2003 (Oral, postdeadline) Hui Zhao, B. Dal Don, G. Schwartz, and H. Kalt, Simultaneous measurement of coherence length and time of quantum-well excitons.
• 2003 (Oral) Hui Zhao, B. Dal Don, S. Moehl, and H. Kalt, Non-classical transport regimes of excitons in semiconductor quantum wells studied by TR Nanophotoluminescence.
• 2002 (Poster) Hui Zhao, S. Wachter, S. Moehl and H. Kalt, Exciton in-plane transport in ZnSe quantum wells.

Contributed Conference Presentations (Others)

1. M. Bieler, N. Laman, H.M. van Driel, Hui Zhao, and A.L. Smirl, Generation of pure spin currents or spin-polarized electrical currents in GaAs quantum wells using monochromatic light, Oral Presentation on NOEKS-8 (2006).
2. A.L. Smirl, Hui Zhao, X.Y. Pan, R.D.R. Bhat, A. Najmaie, J.E. Sipe, and H.M. van Driel, Injection of ballistic pure spin currents in a GaAs quantum well by single-color linearly polarized light, Oral Presentation on HCIS-14 (2005).
3. B. Dal Don, Hui Zhao, G. Schwartz, T. Unkelbach,  and H. Kalt, Coherence length and time of excitons in ZnSe quantum wells, Oral Presentation on OECS-8 (2006).
4. B. Dal Don, Hui Zhao, G. Schwartz, and H. Kalt, Spatial breathing of the exciton distribution in ZnSe quantum wells, Oral Presentation on II-VI 2003.
5. A. Reznitsky, A. Klochikhin, S. Permogorov, I. Sedova, S. Sorokin, S. Ivanov, H. Priller, B. Dal Don, Hui Zhao, H. Kalt, C. Klingshirn, Exciton states and energy relaxation in ZnCdSe nano-islands, Poster Presentation on NOEKS'2003.
6. Hui Zhao, B. Dal Don, S. Moehl, and H. Kalt, Non-classical transport of quantum-well excitons, Oral Presentation on NOEKS'2003.
7. B. Dal Don, Hui Zhao, S. Moehl, C. Zeigler, and H. Kalt, Solid immersion lens enhanced microphotoluminescence for single quantum dot spectroscopy, Oral Presentation on QD'2002.
8. Hui Zhao, S. Moehl, B. Dal Don, and H. Kalt, Excitonic transport in quantum well: coherence length and spatial energy relaxation, Oral presentation on ICPS'2002.
9. Hui Zhao, S. Wachter, and H. Kalt, Homogeneous linewidth of localized excitons in GaAs/AlAs superlattice, Poster Presentation on OECS-7 (2003).
10. Hui Zhao, S. Moehl, and H. Kalt, Non-diffusive in-plane transport of excitons in ZnSe quantum wells, Oral (Postdeadline) presentation on II-VI'2002.
11. E. Kurtz, M. Schmidt, D. Litvinov, B. Dal Don, R. Dianoux, Hui Zhao, H. Kalt, A. Rosenauer, D. Gerthsen, and C. Klingshirn, Correlation in vertically stacked CdSe based quantum islands, Oral presentation on II-VI'2002.
12. A. Reznitsky, A. Klochikhin, S. Permogorov, L. Tenishev, I. Sedova, S. Sorokin, S. Ivanov, M. Schmidt, Hui Zhao, E. Kurtz, H. Kalt, C. Klingshirn, Spectroscopic evidence for the exciton percolation threshold in LD ZnCdSe solutions with nano-islands, Poster Presentation on II-VI'2002.
13. Hui Zhao, Y.S.Wang, Z. Xu and X.R. Xu, Influence of spatial charges on transport properties of thin film electroluminescent displays, Oral Presentation on MRS'99.
14. L.X. Yi, Y.B. Hou, Hui Zhao, D.W. He, Z. Xu, Y.S. Wang, and X.R. Xu, The photo- and electro-luminescence properties of ZnO:Zn thin film, Poster Presentation on MRS'99.