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Hong-Wen Jiang

Experimental Condensed Matter

Office: 6-130E Knudsen Hall
Phone: (310) 825-1796

email: jiangh@physics.ucla.edu

 

California NanoSystems Institute Member Home Page

 

Current Postdocs:

Xinchang Zhang

Ming Xiao

Current Ph. D. Students:

Michael Cheung

Xin Xiao

Current Undergraduates:

Rina Kakimi

Research Supported by:

Educational Background:

HongWen Jiang received a Ph.D. degree in physics from Case Western Reserve University in 1989, where he studied under the direction of Prof. Arnold Dahm.  Jiang was a Postdoctoral Fellow at Princeton University from 1989-91, where he worked with Profs. Dan Tsui and Horst Stormer. He joined the Department of Physics at UCLA as an Assistant Professor in 1991. He was promoted to tenure in 1994, and to Full Professor in 1998.  Jiang was an Alfred P. Sloan Fellow (1992-94) and he was the recipient of the 1993 William L. McMillan Award for outstanding contributions in condensed matter physics "for his ground-breaking experiments on the interactions between electrons and magnetic fields in various quantum Hall systems and electron localization phenomena".  He also received the 1996 Overseas Chinese Physics Association Outstanding Young Researcher Award "for the study of the quantum Hall effect and the discovery of the magnetic-field-induced delocalization transition".  He is a fellow of the American Physical Society.  At UCLA, he has been given the Outstanding Teaching Award by the physics department 14 times in the last 16 years, including the Overall Excellence Award (i.e., Teacher of the Year Award) in 2001/2002 and 2005/2006.

Research Interest:

• Solid State Implementations of Quantum Information Processing 

The objective of this research is to develop basic building blocks for quantum computation and quantum communications using individual electron spins and photons in semiconductors. Ongoing efforts include the coherent manipulation of electron and nuclear spins, detection of the quantum states of single electron spins, and nanofabrication of electrostatic-gates-defined quantum bits and read-out channels in advanced SiGe heterostructures. 

• Physics of Two-Dimensional Electron Systems

The objective is to gain a fundamental understanding of magnetic-field-induced delocalization and quantum phase transitions in correlated and disordered two-dimensional electronic systems.  Ongoing experiments employ electrically detected NMR (nuclear magnetic resonance) and ESR (electron spin resonance) to probe spin excitations of two-dimensional electrons in a GaAs/AlGaAs quantum-well with two quantized subbands.  The research has revealed a rich phase diagram with intriguing topologies and potentially new electronic phases due to the interaction of two energy levels with opposite spin and different orbital (i.e., subband) quantum numbers.  The group also conducts high-sensitivity thermodynamic measurements, as these measurements provide a means to probe the many-body ground state properties of the interacting charge carriers.

• Spin Torque Devices for High Frequency Electronics

The objective of this research is to develop applications of spin-torque devices for switching logic, clock distributions, and on-chip, inter-chip wireless communications that are compatible with current semiconductor technologies.  The group currently studies spin dynamics of nano-patterned magnetic multilayer structures, induced by spin momentum transfer, at microwave frequencies. 

Selected Recent Publications:

X.C. Zhang, G. D. Scott, and H.W. Jiang, " NMR Probing of Spin Excitations in the Ring-Like Structure of a Two-Subband System"

Phys. Rev. Lett., 98, 246802 (2007).

G. D. Scott, M. Xiao, E. Croke, E. Yablonovitch, and H. W. Jiang, " Sputtered gold as an effective Schottky gate for strained Si/SiGe nanostructures", 

Appl. Phys. Lett. 90, 032110 (2007).  

Gavin D. Scott, Kelly S. Chichak, Andrea J. Peters, J. Fraser Stoddart, and H. W. Jiang, "Mechanism of enhanced rectification in unimolecular Borromean ring devices"

Phys. Rev. B 74, 113404 (2006).

X.C. Zhang, I. Martin, and H.W. Jiang, "Landau level anticrossing manifestations in the phase-diagram topology of a two-subband system", 

Phys. Rev. B 74, 073301 (2006).  

X. C. Zhang, D. R. Faulhaber, and H. W. Jiang," Multiple Phases with the Same Quantized Hall Conductance in a Two-Subband System" 

Phys. Rev. Lett. 52, 216801 (2005).

D.R. Faulhaber and H.W. Jiang, "Nonequilibrium Magnetization of a Two-Dimensional Electron Gas in a Static Magnetic Field"

Phys. Rev. B 72, 233308 (2005). 

M. Sakr, E. Croke, E. Yablonovitch, and H. W. Jiang, " Fabrication and Characterization of Electrostatic Si/SiGe Quantum Dots with an Integrated Read-out Channel"

Appl. Phys. Lett. 87,  223104 (2005).  

D. Sethu, Rao, T. Szkopek, E. Yablonovitch, and H. W. Jiang,

"Single Photoelectron Trapping, Storage, and Detection in a One-Electron Quantum Dot"

J. of Appl. Phys., 98, 114507 (2004).

M. Xiao, I. Martin, E. Yablonovitch, and H. W. Jiang, "Electrical Detection of the Spin Resonance of a Single Electron in a Silicon Field-Effect Transistor"

Nature 430, 435 (2004).

M. Xiao, I. Martin, and H. W. Jiang, " Probing Spin State of a Single Electron Trap by Random Telegraph Signal"

Phys. Rev. Lett. 93, 078301 (2003).

I. Martin, D. Mozyrsky, and H. W. Jiang, "A scheme for Electrical Detection of Spin Resonance Signal from a Single-Electron Trap",

Phys. Rev. Lett. 90, 18301 (2003).

 

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