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Postdoctoral Scholars

Dr. Monica Allen

I joined the Shen group in June 2016 as a postdoctoral fellow after completing my Ph.D. at Harvard University. In my thesis, I used transport techniques to probe and manipulate electronic states in graphene, including discrete energy levels in artificial atoms and correlated electron states driven by strong interactions. The remarkable properties of graphene have stimulated interest in a broader class of relativistic materials, which often display current flow in exotic geometries as a consequence of their topological properties: for example, topological insulators have a conducting surface that encloses an insulating interior. My research, conducted jointly in the Shen and Goldhaber-Gordon labs, aims to combine microwave impedance microscopy (MIM) with transport measurements to spatially visualize topological states and utilize them for emerging technologies such as quantum computation. Systems of interest include magnetic topological insulators, Weyl semimetals, conduction networks in multi-domain systems, and new candidates for the quantum spin Hall effect.
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Dr. Zhuoyu Chen

I joined the Shen group in April 2018 as a postdoctoral researcher. I obtained my B.S. in Mathematics and Physics from Tsinghua University, Beijing, China in 2012. I received my Ph.D. in Applied Physics from Stanford University, California, USA in April 2018. For my doctoral thesis, I studied the dual-gate controlled two-dimensional ground states of a superconducting oxide interface, using pulsed laser deposition for sample synthesis and dilution refrigerator for low-temperature transport measurements. My current interest is to study superconductivity and correlated electrons combining oxide/chalcogenide molecular beam epitaxy, scanning probe microscopy, and angle-resolved photoemission spectroscopy.
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Dr. Nicolas Gauthier

In March 2018, I joined the Shen group as a postdoctoral scholar supported by a fellowship from the Swiss National Science Foundation. I obtained my B.Sc. and M.Sc. degrees in physics from Université de Montréal in Canada. In October 2017, I completed my Ph.D. at the Paul Scherrer Institut (PSI) and ETH Zürich in Switzerland where I studied frustrated magnets, heavy fermions and multiferroics with neutron and X-ray scattering. Through these investigations, I became very interested in the physics of magnetic and electric multipoles in f-electron materials, and more generally in the interplay between the magnetic and electric degrees of freedom. Here, I am getting new insights of the properties of quantum materials by looking into the time domain. Specifically, my work focuses on time- and angle-resolved photoemission spectroscopy (trARPES) in heavy fermions and other strongly correlated materials such as the manganites.
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Dr. Heike Pfau

In October 2015, I joint the Shen group as a postdoctoral research fellow supported by a Feodor Lynen Fellowship from the Humboldt Foundation in Germany. I received my Ph.D in March 2015 from the TU Dresden, Germany. In my thesis work conducted at the Max-Planck Institute for Chemical Physics of Solids (MPI CPfS), I studied heavy fermion systems focusing on quantum criticality, the Kondo effect, and Lifshitz transitions. Additionally, I studied a skutterudite compound to reveal its superconducting order parameter. Technically, I concentrated on thermal and thermoelectric transport at very low temperatures. Here, I am utilizing the facilities provided by the Stanford University and the Stanford Synchrotron Radiation Lightsource (SSRL) to study Iron-based high-temperature superconductors by means of angle-resolved photoemission spectroscopy in order to investigate their unconventional superconducting nature. It is fascinating for me to explore unconventional electronic phases in strongly correlated electron systems using different experimental techniques: traditional low-temperature bulk probes and modern spectroscopy.
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Dr. Shoya Sakamoto

I joined Shen group as a postdoctoral researcher in April 2018 supported by a fellowship from the Japan Society For the Promotion of Science (JSPS). I received my B.S. and Ph.D. in Physics from the University of Tokyo. In my Ph.D. work, I studied the electronic structures and magnetic properties of spintronics materials such as ferromagnetic semiconductors using (angle-resolved) photoemission spectroscopy, x-ray magnetic circular dichroism, and first-principles calculations. Here, I am involved in the development of a novel spin-resolved ARPES system and excited to see the exotic spin-related phenomena in quantum materials.
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Dr. Hadas Soifer

I joined the Shen group as a postdoctoral researcher in November 2014. I received my Ph.D from the Weizmann Institute of Science in Israel. My Ph.D. research was in the field of attosecond physics – I studied structure and extremely fast dynamics of electrons in atoms and molecules, through the strong-light matter interaction known as High Harmonics Generation. Here I work on time-resolved ARPES experiments on quantum materials. I am fascinated by the complex interactions between the different degrees of freedom in these materials, and by the potential to probe and control these interactions with light.
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Dr. Shujie Tang

I am currently a postdoctoral researcher in Shen group. My research focused on graphene growth on hexagonal boron nitride (h-BN) by the chemical vapor deposition (CVD) method. A new method of boosting graphene growth utilizing gaseous catalyst was investigated. Largest graphene growth rate and graphene single crystal domain on dielectric were obtained by this method. Based on the unique microwave impedance microscopy (MIM) and the work I did, my current research focus on the characterization of graphene grain boundaries and defects by using MIM.
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Dr. Jinpeng Wu

I joined Shen Group as a postdoctoral research fellow in Feb. 2016. I received B.Sc and Ph.D of Electrical Engineering from Tsinghua University in Jul. 2010 and Jul. 2015, respectively. Besides, I got B.Sc of Economics as a double degree from Peking University in Jul. 2012. Currently, I am based at Advanced Light Source of Lawrence Berkeley National Laboratory, using soft X-ray spectroscopy (XAS, XES and RiXS) to analyze the fundamental mechanism of energy storage materials (especially for large-scale, or grid scale application). My other research interests include transient performance of power transmission system, electromagnetic compatibility, novel techniques for DC power transmission system, etc. I was elected as the 24th President of Graduates Union, Tsinghua University from Dec. 2013 to Dec. 2014; in 2015, I became the Young Leadership Fellow of Committee of 100, US.

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Dr. Hao Yan

I am currently a joint postdoctoral fellow between Shen and Melosh labs. I received my Ph.D. in chemistry from Harvard in 2010. From 2010 to 2011 I was a postdoctoral researcher at Harvard under the advisory of Charles Lieber. My current research focuses on the material science of diamondoids - essentially molecular-scale diamond. Our unique capability to separate, chemically functionalize and assemble these molecules offers an ideal playground for materials scientists to study the properties of diamond and diamond-like structures at the nanometer scale. My current interest lies on the photoemission and electron-phonon interaction in diamondoids and their hybrid structures; in the long term I am also interested in understanding their thermal, mechanical and electronic properties, as well as their applications.
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