Zhi Jackie Yao
Research Scientist
2019 Alvarez Postdoctoral Researcher
Applied Mathematics and Computational Research Division
Overview and Research Interests
I am a Research Scientist in the
Computing Sciences Area
at the Lawrence Berkeley National Laboratory.
I have a combined background of computational science and domain sciences of waves, materials, and wireless techniques.
My current primary research interest is in highfidelity computational algorithms for microelectronics and quantum chip applications.

Microelectronics and Quantum Chip Modeling
Emerging postCMOS technologies often rely on trialanderror development strategies due to the lack of adequate simulation tools.
There is an everincreasing need for higherfidelity simulations via higher spatiotemporal resolution and/or improved coupling that can seamlessly incorporate
new physics into algorithms for widelyused, standard models.

We address the need for enhanced modeling for more realistic devices by developing an algorithmically
flexible capability that is performant on manycore/GPUbased supercomputers.
The main product of this research is the ARTEMIS package.
ARTEMIS is able to effectively capture the multiphysics aspect of emerging microelectronics, with increased spatial resolutions.
This allows for GPU simulations of various devices including multiferroic logic, ferroelectric capacitors and transistors, magnetic RF devices, highfrequency circuits, etc.
Click
here
for direct access to the ARTEMIS package on GitHub.
Click
here
for a brief overview that I gave in the 2021 Supercomputing Conference (SC21) titled
ExascaleEnabled Physical Modeling for NextGeneration Microelectronics.
Previously
I received the Ph.D. degree in December of 2017 from Electrical and Computer Engineering (ECE) Department at University of California, Los Angeles (UCLA), and continued pursuing research
in the same department as a postdoc until September of 2019. During my graduate study,
my research has been centered on using new physical coupling in novel electronic devices,
specifically the design and characterization of miniaturized multiferroic components in RF systems.
I have proposed, modeled, and characterized strainmediated multiferroic antennas ,
as well as contributed to building ferromagnetic resonanceenhanced electrically small antennas,
Lamb wave resonators with parametric amplification,
and magnetic field receivers based on resonant precession modulation.
Publications
 Z. Yao, R. Jambunathan, Y. Zeng and A. Nonaka, A massively parallel timedomain coupled electrodynamicsmicromagnetics solver.
International Journal of High Performance Computing Applications (IJHPCA), in press, Aug. 2021
 K.Q.T. Luong, W. Gu, F. Fereidoony, L. Yeung, Z. Yao, and Y. E. Wang, Radio frequency precession modulation based magnetic field sensors.
IEEE Access, Jan. 2022
 Z. Yao, S. Tiwari, J. Schneider, R. N. Candler, G. P. Carman, and Y. E. Wang, Enhanced planar antenna efficiency through magnetic thinfilms.
IEEE Journal on Multiscale and Multiphysics Computational Techniques, Dec. 2021
 J. Rivera, Z. Yao, et al. Verification testing of multidynamical solver for multiferroic antennas.
Proceedings of 2021 International Applied Computational Electromagnetics Society Symposium (ACES), Sep. 2021
 M. G. Bautista, Z. Yao, A. Butko, M. Kiran and M. Metcalf, Towards automated superconducting circuit calibration using deep reinforcement learning.
Proceedings of 2021 IEEE Computer Society Annual Symposium on VLSI (ISVLSI), pp. 462467, Jul. 2021
 W. Gu, K. Luong, Z. Yao, H. Cui and Y. E. Wang, Ferromagnetic resonance enhanced electrically small antennas.
IEEE Transactions on Antennas and Propagation, pp. 83048314, Jun. 2021.
 T. Lu, J. D. Schneider, X. Zou, S. Tiwari, Z. Yao, G.P. Carman, R. N. Candler, Y. E. Wang, Lamb wave resonator loaded nonreciprocal RF devices.
Proceedings of IEEE/MTTS International Microwave Symposium (IMS), Aug. 2020
 A. Acosta, K. Fitzell, J. D. Schneider, C. Dong, Z. Yao, R. Sheil, Y. E. Wang, G. P. Carman, N. X. Sun, and J. P. Chang, Underlayer effect on the soft magnetic, high frequency, and magnetostrictive properties of FeGa thin films.
Journal of Applied Physics, 128, 013903, Oct. 2020
 A. Acosta, K. Fitzell, J. D. Schneider, C. Dong, Z. Yao, Y. E. Wang, G. P. Carman, N. X. Sun, and J. P. Chang, Enhancing the soft magnetic properties of FeGa with a nonmagnetic underlayer for microwave applications.
Applied Physics Letters, 116, 222404, Jun. 2020.
 Z. Yao, S. Tiwari, T. Lu, J. Rivera, K. Luong, R. N. Candler, G. P. Carman and Y. E. Wang, Modeling of multiple dynamics in the radiation of bulk acoustic wave (BAW) antennas.
IEEE Journal on Multiscale and Multiphysics Comput. Techniques, pp. 518, Dec. 2019.
 J. D. Schneider, J. P. Domann, M. K. Panduranga, S. Tiwari, P. Shirazi, Z. Yao, et al., Experimental demonstration and operating principles of a multiferroic antenna.
Journal of Applied Physics, vol. 126, 224104, Dec. 2019.
 Z. Yao, H. Cui, R. U. Tok and Y. E. Wang, 3D multiscale unconditionally stable timedomain modeling of nonlinear RF thin film magnetic devices.
roceedings of IEEE International Symposium on Antennas and Propagation and USNCURSI Radio Science Meeting, pp. 10591060, Jul. 2019.
 H. Cui, Z. Yao and Y. E. Wang, Coupling electromagnetic waves to spin waves: a physicsbased nonlinear circuit model for frequencyselective limiters .
IEEE Trans. Microw. Theory Tech., vol. 67, pp. 32213229, Jun. 2019.
 T. Lu, J. D. Schneider, Z. Yao, G. Carman and Y. E. Wang, Nonlinear surface acoustic wave grating for parametric amplification .
Proceedings of IEEE Radio and Wireless Symposium (RWS), Jan. 2019.
 H. Cui, Z. Yao, C. Tao, Y. E. Wang, Nonlinear equivalentcircuit model for thinfilm magnetic material based RF devices .
Proc. IEEE MTTS Int. Microwave Workshop Series on Advanced Materials and Processes for RF&THz Applications (IMWSAMP) , pp. 13, Jul. 2018.
 Z. Yao, H. Cui, T. Itoh, and Y. E. Wang, Multiphysics timedomain modeling of nonlinear permeability in thinfilm magnetic material .
Proc. IEEE International Microwave Symp. (IMS) , pp. 208211, Jun. 2018.
 Z. Yao, R. U. Tok, T. Itoh and Y. E. Wang, A multiscale, unconditionally stable timedomain (MUST) solver unifying electrodynamics and micromagnetics .
IEEE Trans. Microw. Theory Tech., vol. 66, pp (99): 114, May 2018.
 Z. Yao and Y. E. Wang, 3D modeling of BAWbased multiferroic antennas .
Proc. IEEE International Symp. Antennas Propag. & USNC/URSI National Radio Science Meeting (APS/URSI) , pp. 11251126, Jul. 2017.
 (Best Student Paper) Z. Yao and Y. E. Wang, 3D unconditionally stable FDTD modeling of micromagnetics and electrodynamics .
Proc. IEEE International Microwave Symp. (IMS) , pp. 1215. Jun. 2017.
 Z. Yao and Y. E. Wang, 3D ADIFDTD modeling of platform reduction with thin film ferromagnetic material .
Proc. IEEE APS/URSI , pp. 20192020, Jun. 2016.
 Z. Yao, Y. E. Wang, S. Keller, G. P. Carman, Bulk acoustic wave mediated multiferroic antennas: architecture and performance bound .
IEEE Trans. Antennas Propag , vol. 63, pp. 33353344, Aug. 2015.
 Z. Yao and Y. E. Wang, Bulk acoustic wave mediated multiferroic antennas near ferromagnetic resonance .
Proc. IEEE APS/URSI , pp. 18321833, Jul. 2015.
 Z. Yao, Q. Xu and Y. E. Wang, FDTD analysis of platform effect reduction with thin film ferrite .
Proc. IEEE Radio and Wireless Symposium , pp. 5961, Jan. 2015.
 Z. Yao and Y. E. Wang, Dynamic analysis of acoustic wave mediated multiferroic radiation via FDTD methods .
Proc. IEEE APS/URSI , pp. 731732, Jul. 2014.
