Dong Yu

Associate Professor
Department of Physics
University of California at Davis

Office:   203 Physics
Phone:  530-554-1630
Fax:      530-752-4717
Email:   yu at physics.ucdavis.edu

2014-          Associate Professor of Physics, University of California at Davis
2008-2014  Assistant Professor of Physics, University of California at Davis

2005-2008  Postdoc, Harvard University
2000-2005  Ph.D. in Physics, University of Chicago
1995-2000  B.S. in MSE, University of Science and Technology of China

Curriculum Vitae


Openings: Graduate student researcher positions are available in my group. If interested, you are encouraged to contact me at yu@physics.ucdavis.edu

Research Interest

Our research group explores condensed matter physics taking advantage of the monocrystallinity and the large surface-to-volume ratio in low dimensional nanocrystals. We are particularly interested in strongly correlated materials such as VO2, topological insulators, and photovoltaic materials including lead salt and hybrid perovskites. Our work is mainly supported by National Science Foundation.

1) Nanowires for solar cell applications: Confinement of electrons and photons allows for enhanced absorption and photovoltaic performance.
PbS
                 

Xiao, R., Hou, Y., Fu, Y., Peng, X., Wang, Q., Gonzalez, E., Jin, S., & Yu, D., Photocurrent Mapping in Single-Crystal Methylammonium Lead Iodide Perovskite Nanostructures. Nano Letters, 16 (12), 7710-7717 (2016). (pdf)
Yang, Y., Peng, X., Hyatt, S., Yu, D., Broadband Quantum Efficiency Enhancement in High Index Nanowire Resonators, Nano Letters, 15, 3541-3546 (2015). (pdf)
Triplett, M., Yang, Y., Leonard, F., Talin, A. A., Islam, M. S., Yu, D., Long Minority Carrier Diffusion Lengths in Bridged Silicon Nanowires, Nano Letters, 15, 523-529 (2015). (pdf)
Otto, T., Miller, C., Tolentino, J., Liu, Y., Law, M., and Yu, D., Gate-Dependent Carrier Diffusion Length in Lead Selenide Quantum Dot Field-Effect Transistors. Nano Lett., 13, 3463 (2013). (pdf)
Yang, Y., Li, J., Wu, H., Oh, E., and Yu, D., Controlled Ambipolar Doping and Gate Voltage Dependent Carrier Diffusion Length in Lead Sulfide Nanowires. Nano Lett., 12, 5890 (2012). (pdf)
Graham, R. and Yu, D., High Carrier Mobility in Single Ultrathin Colloidal Lead Selenide Nanowire Field Effect Transistors. Nano Lett., 12, 4360 (2012). (pdf)
Wu, H., Yang, Y., Oh, E., Lai, F., and Yu, D., Direct Synthesis of High-density Lead Sulfide Nanowires on Metal Thin Films Towards Efficient Infrared Light Conversion. Nanotechnology, 23, 265602 (2012). (pdf)
Graham, R., Miller, C., Oh, E., & Yu, D. Electric Field dependent photocurrent decay length in single lead sulfide nanowire field effect transistors. Nano Lett., 11, 717 (2011). (pdf)


2) Metal insulator transition in strongly correlated materials: VO2 undergoes insulator-metal transition and is one of the most studied strongly correlated materials. We have investigated the electronic structure at the junction of metal-insulator domain walls in VO2 and revealed a band bending at the domain walls.

VO2

Miller, C., Triplett, M., Lammatao, J., Suh, J., Fu, D., Wu J., & Yu, D. Unusually long free carrier lifetime and metal-insulator band offset in vanadium dioxide. Phys. Rev. B, 85, 085111 (2012). (pdf)
Peng, X., Yang, Y., Hou, Y., Travaglini, H. C., Hellwig, L., Hihath, S., van Benthem, K., Lee, K., Liu, W., Yu, D., Efficient and Hysteresis-Free Field Effect Modulation of Ambipolarly Doped Vanadium Dioxide Nanowires. Physical Review Applied, 5, 054008 (2016).(pdf)


3) Topological insulators: topological insulators such as Bi2Se3 own exotic metallic surface states where spins and momentum are locked and are promising materials for spintronic applications.
TIs

Peng, X., Yang, Y., Singh, R., Savrasov, S., Yu, D., Spin Generation Via Bulk Spin Current in Three Dimensional Topological Insulators, Nature Communications, 7, 10878 (2016). (pdf)

Publication List


34.    Kim, B.-K., Kim, H.-S., Yang, Y., Peng, X., Yu, D., & Doh, Y.-J.,  Strong Superconducting Proximity Effects in PbS Semiconductor Nanowires. ACS Nano, 11 (1), 221-226 (2017). (pdf)

33.    Xiao, R., Hou, Y., Fu, Y., Peng, X., Wang, Q., Gonzalez, E., Jin, S., & Yu, D., Photocurrent Mapping in Single-Crystal Methylammonium Lead Iodide Perovskite Nanostructures. Nano Letters, 16 (12), 7710-7717 (2016). (pdf)

32.    Peng, X., Yang, Y., Hou, Y., Travaglini, H. C., Hellwig, L., Hihath, S., van Benthem, K., Lee, K., Liu, W., Yu, D., Efficient and Hysteresis-Free Field Effect Modulation of Ambipolarly Doped Vanadium Dioxide Nanowires. Physical Review Applied, 5, 054008 (2016).(pdf)

31.    Peng, X., Yang, Y., Singh, R., Savrasov, S., Yu, D., Spin Generation Via Bulk Spin Current in Three Dimensional Topological Insulators, Nature Communications, 7, 10878 (2016). (pdf)

30.    Kim, H.-S., Kim, B.-K., Yang, Y., Peng, X., Lee, S.-G., Yu, D., Doh, Y.-J., Gate-tunable superconducting quantum interference devices of PbS nanowires, Applied Physics Express, 9, 023102 (2016). (pdf)

29.    Yang, Y., Peng, X., Hyatt, S., Yu, D., Absorption Enhancement and Carrier Diffusion in Single Lead Sulfide Nanowire Schottky Solar Cells, Proc. of SPIE, 9553, 955307 (2015) (Invited paper). (pdf)

28.    Yang, Y., Peng, X., Kim H. S., Kim T., Jeon S., Kang H. K., Choi, W., Song, J.,Doh, Y. J., Yu, D., Hot Carrier Trapping Induced Negative Photoconductance in InAs Nanowires toward Novel Nonvolatile Memory, Nano Letters, 15, 5875−5882 (2015). (pdf)

27.    Yang, Y., Peng, X., Hyatt, S., Yu, D., Broadband Quantum Efficiency Enhancement in High Index Nanowire Resonators, Nano Letters, 15, 3541-3546 (2015). (pdf)

26.    Triplett, M., Yang, Y., Leonard, F., Talin, A. A., Islam, M. S., Yu, D., Long Minority Carrier Diffusion Lengths in Bridged Silicon Nanowires, Nano Letters, 15, 523-529 (2015). (pdf)

25.    Goswami, S.K., Kim J., Hong, K. Oh, E., Yang, Y., and Yu, D.,  Photocurrent and photovoltaic characteristics of copper sulfide nanowires grown by a hydrothermal method. Materials Letters, 133, 132-134 (2014).(pdf)

24.    Nisson, D. M., Dioguardi, A. P., Peng, X., Yu, D., and Curro, N. J., Anomalous nuclear magnetic resonance spectra in Bi2Se3 nanowires. Phys. Rev. B, 90, 125121 (2014). (pdf)

23.    Yang, Y., Peng, X., Yu, D., High intensity induced photocurrent polarity switching in lead sulfide nanowire field effect transistors. Nanotechnology, 25, 195202 (2014). (pdf)

22.    Yang, Y., Peng, X., Yu, D., Spatially Resolved Optoelectronics in Lead Sulfide Nanowires. ECS Transactions, 58, 87 (2013). (pdf)

21.    Graham, R., Yu, D., Scanning Photocurrent Microscopy In Semiconductor Nanostructures. Modern Physics Letters B, 27, 1330018 (2013). (invited review pdf)

20.    Otto, T., Miller, C., Tolentino, J., Liu, Y., Law, M., and Yu, D., Gate-Dependent Carrier Diffusion Length in Lead Selenide Quantum Dot Field-Effect Transistors. Nano Lett., 13, 3463 (2013). (pdf)

19.    Otto, T., and Yu, D., Positive Temperature Coefficient of Resistance and Bistable Conduction in Lead Selenide Quantum Dot Thin Films. J. Phys. Chem. C., 117, 3713 (2013). (pdf)

18.    Yang, Y., Li, J., Wu, H., Oh, E., and Yu, D., Controlled Ambipolar Doping and Gate Voltage Dependent Carrier Diffusion Length in Lead Sulfide Nanowires. Nano Lett., 12, 5890 (2012). (pdf)

17.    Graham, R. and Yu, D., High Carrier Mobility in Single Ultrathin Colloidal Lead Selenide Nanowire Field Effect Transistors. Nano Lett., 12, 4360 (2012). (pdf)

16.    Wu, H., Yang, Y., Oh, E., Lai, F., and Yu, D., Direct Synthesis of High-density Lead Sulfide Nanowires on Metal Thin Films Towards Efficient Infrared Light Conversion. Nanotechnology, 23, 265602 (2012). (pdf)

15.    Isheim, D., Kaszpurenko, J., Yu, D., Mao, Z., Seidman, D., and Arslan, I., 3-D Atomic-Scale Mapping of Manganese Dopants in Lead Sulfide Nanowires. J. Phys. Chem. C, 116, 6595 (2012). (pdf)

14.    Miller, C., Triplett, M., Lammatao, J., Suh, J., Fu, D., Wu J., & Yu, D. Unusually long free carrier lifetime and metal-insulator band offset in vanadium dioxide. Phys. Rev. B, 85, 085111 (2012). (pdf)

13.    Fu, D., Zou, J., Wang, K., Zhang, R., Yu, D., & Wu, J. Electrothermal dynamics of semiconductor nanowires under local carrier modulation. Nano Lett., 11(9), 3809 (2011). (pdf)

12.    Graham, R., Miller, C., Triplett, M., & Yu, D. Scanning photocurrent microscopy in single nanowire devices. Proc. of SPIE, 8106, 81060K (2011) (Invited paper). (pdf)

11.    Graham, R., Miller, C., Oh, E., & Yu, D. Electric Field dependent photocurrent decay length in single lead sulfide nanowire field effect transistors. Nano Lett., 11, 717 (2011). (pdf)

10.    Yu, D., Brittman, S., Lee, J., Falk, A. L. & Park, H. Minimum voltage for threshold switching in nanoscale phase-change memory. Nano Lett. 8, 3429 (2008). (pdf)

9.    Lee, J., Brittman, S., Yu, D. & Park, H. Vapor-liquid-solid and vapor-solid growth of phase-change Sb2Te3 nanowires and Sb2Te3/GeTe nanowire heterostructures. J. Am. Chem. Soc. 130, 6252 (2008). (pdf)

8.    Guyot-Sionnest, P., Yu, D., Jiang, P. H. & Kang, W. Spin blockade in the conduction of colloidal CdSe nanocrystal films. J. Chem. Phys. 127, 014702 (2007). (pdf)

7.    Yu, D., Wu, J., Gu, Q. & Park, H. Germanium telluride nanowires and nanohelices with memory-switching behavior. J. Am. Chem. Soc. 128, 8148 (2006). (pdf)

6.    Yu, D., Wehrenberg, B. L., Jha, P., Ma, J. & Guyot-Sionnest, P. Electronic transport of n-type CdSe quantum dot films: Effect of film treatment. J. Appl. Phys. 99, 104315 (2006). (pdf)

5.    Yu, D., Wehrenberg, B. L., Yang, I., Kang, W. & Guyot-Sionnest, P. Magnetoresistance of n-type quantum dot solids. Appl. Phys. Lett. 88, 072504 (2006). (pdf)

4.    Guyot-Sionnest, P., Wehrenberg, B. & Yu, D. Intraband relaxation in CdSe nanocrystals and the strong influence of the surface ligands. J. Chem. Phys. 123, 074709 (2005). (pdf)

3.    Wehrenberg, B. L., Yu, D., Ma, J. S. & Guyot-Sionnest, P. Conduction in charged PbSe nanocrystal films. J. Phys. Chem. B 109, 20192 (2005). (pdf)

2.    Yu, D., Wang, C. J., Wehrenberg, B. L. & Guyot-Sionnest, P. Variable range hopping conduction in semiconductor nanocrystal solids. Phys. Rev. Lett. 92, 216802 (2004). (pdf)

1.    Yu, D., Wang, C. & Guyot-Sionnest, P. n-type conducting CdSe nanocrystal solids. Science 300, 1277 (2003). (pdf)


Courses
PHY 1A Principles of physics
PHY 9A Classical Mechanics
PHY 9C Electricity and Magnetism
PHY 9HC Honor Quantum Mechanics
PHY 110ABC  Electricity and Magnetism (Upper division)
PHY 250 Introduction to Nanoscale Science (Graduate)