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 Material Science, University of Science and Technology of China

Curriculum Vitae


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. Our work is mainly supported by National Science Foundation and UC Lab Fees program. Recent research topics include:

1) Topological insulators: explore how charge and spin transport in topological insulators for spintronics and quantum computation.
 

Y. Hou, R. Wang, R. Xiao, L. McClintock, H.C. Travaglini, J.P. Francia, H. Fetsch, O. Erten, S.Y. Savrasov, B. Wang, A. Rossi, I. Vishik, E. Rotenberg, and D. Yu, "Emergence of excitonic superfluid at topological-insulator surfaces," arXiv (2018). arXiv:1810.10653

X. Peng, Y. Yang, R.R.P. Singh, S.Y. Savrasov, and D. Yu, "Spin generation via bulk spin current in three-dimensional topological insulators," Nature Communications, 7, 10878 (2016). 10.1038/ncomms10878

2) Halide perovskites: understand why these materials are so good at converting light into electricity and make it even better.


R. Xiao, Y. Hou, Y. Fu, X. Peng, Q. Wang, E. Gonzalez, S. Jin, and D. Yu, "Photocurrent Mapping in Single-Crystal Methylammonium Lead Iodide Perovskite Nanostructures," Nano Letters, 16, 7710-7717 (2016). 10.1021/acs.nanolett.6b03782

3) Metal insulator transition: can we make a faster computer based on phase transition?



Y. Hou, R. Xiao, X. Tong, S. Dhuey, and D. Yu, "In Situ Visualization of Fast Surface Ion Diffusion in Vanadium Dioxide Nanowires," Nano Letters, 17, 7702-7709 (2017). 10.1021/acs.nanolett.7b03832

X. Peng, Y. Yang, Y. Hou, H.C. Travaglini, L. Hellwig, S. Hihath, K. van Benthem, K. Lee, W. Liu, and D. Yu, "Efficient and Hysteresis-Free Field Effect Modulation of Ambipolarly Doped Vanadium Dioxide Nanowires," Physical Review Applied, 5, 054008 (2016). 10.1103/PhysRevApplied.5.054008

4) Nanowire and quantum dot solar cells: confine electrons and photons allows for enhanced absorption and more efficient solar cells.
PbS
                 
Y. Yang, X. Peng, S. Hyatt, and D. Yu, "Broadband quantum efficiency enhancement in high index nanowire resonators," Nano letters, 15, 3541-3546 (2015). 10.1021/acs.nanolett.5b01008

M. Triplett, Y. Yang, F. Leonard, A.A. Talin, M.S. Islam, and D. Yu, "Long Minority Carrier Diffusion Lengths in Bridged Silicon Nanowires," Nano Letters, 15, 523-529 (2015). 10.1021/nl503870u

T. Otto, C. Miller, J. Tolentino, Y. Liu, M. Law, and D. Yu, "Gate-Dependent Carrier Diffusion Length in Lead Selenide Quantum Dot Field-Effect Transistors," Nano Letters, 13, 3463-3469 (2013). 10.1021/nl401698z


Publication List

1.             Y. Hou, R. Wang, R. Xiao, L. McClintock, H.C. Travaglini, J.P. Francia, H. Fetsch, O. Erten, S.Y. Savrasov, B. Wang, A. Rossi, I. Vishik, E. Rotenberg, and D. Yu, "Emergence of excitonic superfluid at topological-insulator surfaces," arXiv (2018). arXiv:1810.10653

2.             R. Xiao, Y. Hou, M. Law, and D. Yu, "On the Use of Photocurrent Imaging To Determine Carrier Diffusion Lengths in Nanostructured Thin-Film Field-Effect Transistors," The Journal of Physical Chemistry C, 122, 18356-18364 (2018). 10.1021/acs.jpcc.8b06734

3.             Y. Hou, R. Xiao, X. Tong, S. Dhuey, and D. Yu, "In Situ Visualization of Fast Surface Ion Diffusion in Vanadium Dioxide Nanowires," Nano Letters, 17, 7702-7709 (2017). 10.1021/acs.nanolett.7b03832

4.             J. Kim, E. Oh, R. Xiao, S. Ritter, Y. Yang, D. Yu, J.H. Im, S.H. Kim, W.J. Choi, and J.-G. Park, "Optical properties and bridge photodetector integration of lead sulfide nanowires," Nanotechnology, 28, 475706 (2017).

5.             B.-K. Kim, H.-S. Kim, Y. Yang, X. Peng, D. Yu, and Y.-J. Doh, "Strong Superconducting Proximity Effects in PbS Semiconductor Nanowires," ACS Nano, 11, 221-226 (2017). 10.1021/acsnano.6b04774

6.             R. Xiao, Y. Hou, Y. Fu, X. Peng, Q. Wang, E. Gonzalez, S. Jin, and D. Yu, "Photocurrent Mapping in Single-Crystal Methylammonium Lead Iodide Perovskite Nanostructures," Nano Letters, 16, 7710-7717 (2016). 10.1021/acs.nanolett.6b03782

7.             X. Peng, Y. Yang, R.R.P. Singh, S.Y. Savrasov, and D. Yu, "Spin generation via bulk spin current in three-dimensional topological insulators," Nature Communications, 7, 10878 (2016). 10.1038/ncomms10878

8.             X. Peng, Y. Yang, Y. Hou, H.C. Travaglini, L. Hellwig, S. Hihath, K. van Benthem, K. Lee, W. Liu, and D. Yu, "Efficient and Hysteresis-Free Field Effect Modulation of Ambipolarly Doped Vanadium Dioxide Nanowires," Physical Review Applied, 5, 054008 (2016). 10.1103/PhysRevApplied.5.054008

9.             H.-S. Kim, B.-K. Kim, Y. Yang, X. Peng, S.-G. Lee, D. Yu, and Y.-J. Doh, "Gate-tunable superconducting quantum interference devices of PbS nanowires," Applied Physics Express, 9,  (2016). 10.7567/apex.9.023102

10.           Y. Yang, X. Peng, H.-S. Kim, T. Kim, S. Jeon, H.K. Kang, W. Choi, J. Song, Y.-J. Doh, and D. Yu, "Hot Carrier Trapping Induced Negative Photoconductance in InAs Nanowires toward Novel Nonvolatile Memory," Nano Letters, 15, 5875-5882 (2015). 10.1021/acs.nanolett.5b01962

11.           Y. Yang, X. Peng, S. Hyatt, D. Yu, N. Kobayashi, A. Talin, M. Islam, and A. Davydov, "Absorption Enhancement and Carrier Diffusion in Single Lead Sulfide Nanowire Schottky Solar Cells," Proceedings of SPIE, 9553, 955307 (2015). 10.1117/12.2189939

12.           Y. Yang, X. Peng, S. Hyatt, and D. Yu, "Broadband quantum efficiency enhancement in high index nanowire resonators," Nano letters, 15, 3541-3546 (2015). 10.1021/acs.nanolett.5b01008

13.           M. Triplett, Y. Yang, F. Leonard, A.A. Talin, M.S. Islam, and D. Yu, "Long Minority Carrier Diffusion Lengths in Bridged Silicon Nanowires," Nano Letters, 15, 523-529 (2015). 10.1021/nl503870u

14.           Y. Yang, X. Peng, and Y. Dong, "High intensity induced photocurrent polarity switching in lead sulfide nanowire field effect transistors," Nanotechnology, 25, 195202 (8 pp.) (2014). 10.1088/0957-4484/25/19/195202

15.           D.M. Nisson, A.P. Dioguardi, X. Peng, D. Yu, and N.J. Curro, "Anomalous nuclear magnetic resonance spectra in Bi2Se3 nanowires," Physical Review B, 90, 125121 (2014). 10.1103/PhysRevB.90.125121

16.           S.K. Goswami, J. Kim, K. Hong, E. Oh, Y. Yang, and D. Yu, "Photocurrent and photovoltaic characteristics of copper sulfide nanowires grown by a hydrothermal method," Materials Letters, 133, 132-134 (2014). 10.1016/j.matlet.2014.06.173

17.           T.N. Otto and D. Yu, "Positive Temperature Coefficient of Resistance and Bistable Conduction in Lead Selenide Quantum Dot Thin Films," Journal of Physical Chemistry C, 117, 3713-3717 (2013). 10.1021/jp306893e

18.           T. Otto, C. Miller, J. Tolentino, Y. Liu, M. Law, and D. Yu, "Gate-Dependent Carrier Diffusion Length in Lead Selenide Quantum Dot Field-Effect Transistors," Nano Letters, 13, 3463-3469 (2013). 10.1021/nl401698z

19.          R. Graham and D. Yu, "SCANNING PHOTOCURRENT MICROSCOPY IN SEMICONDUCTOR NANOSTRUCTURES," Modern Physics Letters B, 27,  (2013). 10.1142/s0217984913300184

20.           Y. Yang, J. Li, H. Wu, E. Oh, and D. Yu, "Controlled Ambipolar Doping and Gate Voltage Dependent Carrier Diffusion Length in Lead Sulfide Nanowires," Nano Letters, 12, 5890-5896 (2012). 10.1021/nl303294k

21.           H. Wu, Y. Yang, E. Oh, F. Lai, and D. Yu, "Direct synthesis of high-density lead sulfide nanowires on metal thin films towards efficient infrared light conversion," Nanotechnology, 23,  (2012). 10.1088/0957-4484/23/26/265602

22.           C. Miller, M. Triplett, J. Lammatao, J. Suh, D. Fu, J. Wu, and D. Yu, "Unusually long free carrier lifetime and metal-insulator band offset in vanadium dioxide," Physical Review B, 85, 085111 (2012). 10.1103/PhysRevB.85.085111

23.           D. Isheim, J. Kaszpurenko, D. Yu, Z. Mao, D.N. Seidman, and I. Arslan, "3-D Atomic-Scale Mapping of Manganese Dopants in Lead Sulfide Nanowires," Journal of Physical Chemistry C, 116, 6595-6600 (2012). 10.1021/jp300162t

24.           R. Graham and D. Yu, "High Carrier Mobility in Single Ultrathin Colloidal Lead Selenide Nanowire Field Effect Transistors," Nano Letters, 12, 4360-4365 (2012). 10.1021/nl302161n

25.           R. Graham, C. Miller, E. Oh, and D. Yu, "Electric Field Dependent Photocurrent Decay Length in Single Lead Sulfide Nanowire Field Effect Transistors," Nano Letters, 11, 717-722 (2011). 10.1021/nl1038456

26.           D. Fu, J. Zou, K. Wang, R. Zhang, D. Yu, and J. Wu, "Electrothermal Dynamics of Semiconductor Nanowires under Local Carrier Modulation," Nano Letters, 11, 3809-3815 (2011). 10.1021/nl2018806

27.           D. Yu, S. Brittman, J. Lee, A. Falk, and H. Park, "Minimum Voltage for Threshold Switching in Nanoscale Phase-Change Memory," Nano Letters, 8, 3429-3433 (2008). 10.1021/nl802261s

28.           J. Lee, S. Brittman, D. Yu, and H. Park, "Vapor-liquid-solid. and vapor-solid growth of phase-change Sb2Te3 nanowires and Sb2Te3/GeTe nanowire heterostructures," Journal of the American Chemical Society, 130, 6252-6258 (2008). 10.1021/ja711481b

29.           P. Guyot-Sionnest, D. Yu, P. Jiang, and W. Kang, "Spin blockade in the conduction of colloidal CdSe nanocrystal films," Journal of Chemical Physics, 127,  (2007). 10.1063/1.2748765

30.           D. Yu, J. Wu, Q. Gu, and H. Park, "Germanium telluride nanowires and nanohelices with memory-switching behavior," Journal of the American Chemical Society, 128, 8148-8149 (2006). 10.1021/ja0625071

31.           D. Yu, B. Wehrenberg, I. Yang, W. Kang, and P. Guyot-Sionnest, "Magnetoresistance of n-type quantum dot solids," Applied Physics Letters, 88,  (2006). 10.1063/1.2174089

32.           D. Yu, B. Wehrenberg, P. Jha, J. Ma, and P. Guyot-Sionnest, "Electronic transport of n-type CdSe quantum dot films: Effect of film treatment," Journal of Applied Physics, 99,  (2006). 10.1063/1.2192288

33.           B. Wehrenberg, D. Yu, J. Ma, and P. Guyot-Sionnest, "Conduction in charged PbSe nanocrystal films," Journal of Physical Chemistry B, 109, 20192-20199 (2005). 10.1021/jp053621t

34.           P. Guyot-Sionnest, B. Wehrenberg, and D. Yu, "Intraband relaxation in CdSe nanocrystals and the strong influence of the surface ligands," Journal of Chemical Physics, 123,  (2005). 10.1063/1.2004818

35.           D. Yu, C. Wang, B. Wehrenberg, and P. Guyot-Sionnest, "Variable range hopping conduction in semiconductor nanocrystal solids," Physical Review Letters, 92, 216802 (2004). 10.1103/PhysRevLett.92.216802

36.           D. Yu, C. Wang, and P. Guyot-Sionnest, "n-type conducting CdSe nanocrystal solids," Science, 300, 1277-1280 (2003). 10.1126/science.1084424

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)