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Visiting Investigators

Shengqi Chu
Visiting Investigator

He is a visiting scholar from the Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China. He has been working at the Beijing Synchrotron Radiation Facility since 2011. His research focuses on the X-ray Absorption Spectroscopy measurements on materials.  Shengqi will be at HPCAT for one year.

 

Katherine Crispin
Visiting Investigator
E-mail: kcrispin@ciw.edu
Phone: 202-478-8986

Katherine maintains the (FIB-FESEM) Focused Ion Beam Field Emission Scanning Electron Microscope and also assists users on the SEM and Microprobe. She researches new techniques and applications involving the microbeam instruments and collaborates on research involving pallasite meteorites. She is a Director of the MicroAnalysis Society, and an Associate Editor of American Mineralogist. Her previous research was focused on diffusion in lower mantle minerals where she investigated the effect of crystal field stabilization energy on diffusion rates of transition metals in periclase. She received a Ph.D. in Geological Sciences from Case Western Reserve University and a B.S. in Chemistry from Cedar Crest College.

 

Matthieu Galvez
Visiting Investigator
E-mail: mgalvez@ciw.edu
Phone: 202-478-8987

Matthieu Galvez joins the geophysical laboratory as a new Carnegie Fellow from the Institut de Physique du Globe de Paris, France. He studies the dynamics of carbon in metamorphic nodes with George Cody. R133

 

Russell J. Hemley
Visitng Investigator
E-mail: rhemley@ciw.edu
Phone: 202-478-8951

Russell J. Hemley is a senior staff scientist of the Geophysical Laboratory. His research examines the properties of materials at high-pressures and its applications to geophysics, geochemistry and planetary science, as well as to theoretical condensed-matter physics and chemistry. He uses optical spectroscopy, x-ray diffraction, and diamond-cell techniques to conduct high-pressure experimental and theoretical studies in condensed-matter physics, earth and planetary science and materials science. He obtained a Ph.D. and M.A. in physical chemistry from Harvard University in 1983 and 1980, and received a B.A. in chemistry and philosophy from Wesleyan University in 1977.

 

Valerie Hillgren
Visiting Investigator
E-mail: vhillgren@ciw.edu
Phone: 202-478-8927

Valerie is an experimental geochemist with a B.S. in Geology from the University of Kansas and a Ph.D. in Planetary Science from the University of Arizona. She has studied a variety of problems ranging from the formation and composition of the cores of Earth, the Moon, and Mercury to the fractionation of stable Si and Fe isotopes between metal and silicates. Most of her experimental work is conducted at high pressures and temperatures using the piston cylinder apparatus, the multianvil apparatus, and the laser-heated diamond cell. Currently, she is working with Dr. Anat Shahar on the fractionation of Fe isotopes in Pallasite meteorites.

 

Nicholas Holtgrewe
Visiting Investigator
E-mail: nholtgrewe@ciw.edu
Phone: 202-478-2375

Nicholas Holtgrewe is a visiting investigator from Howard University.  He is working with Alexander Goncharov on laser optics in Raman pump-probe experiments.  His other research interests include superconductors, solar power and laser optics.  

 

Mingqiang Hou
Visiting Investigator
E-mail: mhou@ciw.edu
Phone: 202-478-4566

Mingqiang Hou is a postdoctoral associate working with Yingwei Fei. His research includes observing Earth's core composition by using static and dynamic experiments and upgrading heating techniques in diamond anvil cells. Mingqiang received his Ph.D. from Beijing Institute of Space Environment Engineering.

 

Tomasz Jaron
Visiting Investigator
E-mail: tjaron@uw.edu.pl

Tomasz Jaron is a visiting investigator from the University of Warsaw. He is working with Viktor Struzhkin on high-pressure synthesis and physicochemical properties of novel hydrides of ytterbium and cobalt.

 

Lei Kang
Visiting Investigator
E-mail: chinayaomeng@hotmail.com

Lei Kang joins us as a visiting predoctoral associate from Jilin University in China. He is working with Viktor Struzhkin on researching high-temperature superconductors under high-pressure conditions, such as two-dimensional materials.

 

Lingping Kong
Visiting Invetigator
E-mail: lkong@ciw.edu
Phone: 630-252-2888

Lingping (Lisa) Kong is from the Harbin Institute of Technology in China. She carries out x-ray diffraction experiments at the High Pressure Synergetic Consortium (HPSynC) facility of the GL.

 

Jabrane Labidi
Visiting Investigator
E-mail: jlabidi@ciw.edu
Phone: 202-478-7974

Jabrane Labidi is a postdoctoral fellow working with Anat Shahar on multiple isotope composition of sulfur in organic matter of chondrites.  His other research interests include magmatic geochemistry, mantle geochemistry, volatiles in the planetary interiors, and cosmochemistry. Jabrane received his Ph.D. from the Institut de Physique du Globe de Paris.

 

Quanjun Li
Visiting Investigator
E-mail: liquanjun@jlu.edu.cn

HPCAT

 

Gang Liu
Visiting Investigator

Gang Liu will be working with Dave Mao as Visiting Investigator.  He completed his Ph.D. in Materials Science at the Harbin Institute of Technology. He is an experienced APS User and worked at NSLS, ALS and for Materials Science Research. His research also centers on the properties of ferroelectrics under various external fields.

 

Subhasish Mandal
Visiting Investigator
E-mail: smandal@ciw.edu
Phone: 202-478-8945

Subhasish is studying Fe-based superconducting materials through first principles simulations using DFT+DMFT. His research focuses on understanding these newly-found superconductors both in the presence and absence of pressure. Subhasish received his PhD from the department of Physics, Michigan Technological University in summer 2012. He obtained his M.Sc in Physics from Indian Institute of Technology Madras in 2007 and B.Sc degree with Physics Honors from the University of Calcutta (India) in 2005. He can be found in room R106.

 

Naira Martirosyan
Visiting Investigator
E-mail: martirosyanns@gmail.com

Naira Martirosyan is a visiting investigator from the Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russia. She is working with Alex Goncharov on carbon speciation and redox reaction experiments in relation to Earth’s mantle and core.

 

Stewart McWilliams
Visiting Investigator
E-mail: smcwilliams@ciw.edu

Stewart McWilliams is a shock-wave researcher educated at the University of California Berkeley and at Lawrence Livermore National Laboratory. He is working as a postdoc at Howard University studying high-pressure materials chemistry, transport properties, and equations of state with ultra-fast heating and measurement techniques in the diamond-anvil cell.

 

Caitlin Murphy
Visiting Investigator
E-mail: cmurphy@ciw.edu
Phone: 202-478-2373

Caitlin Murphy joins us as a new Carnegie Fellow working with Yingwei Fei and Russell Hemley. She is interested in understanding how defects and impurities influence the structural, vibrational, and electronic properties of materials at high pressures. Her postdoctoral research will focus on experimentally probing the effects of composition, pressure, and temperature on the transport properties of mantle and core materials using diamond anvil cells and advanced radiation sources. Caitlin received a B.S. in Earth, Atmospheric and Planetary Sciences from MIT in 2007, and a Ph.D. in Geophysics from Caltech in 2012. Presently, she occupies a desk in R-133

 

Haiyun (Kevin) Shu
Visiting Investigator
E-mail: hshu@ciw.edu
Phone: 202-478-8875

Kevin has been working at GL as a lab technician since 2005 and he covers the gravy yard shift between 9pm - 9am. His duties include the maintenance and operation of microwave plasma CVD systems, iron wheel polishing machines, and preparation of diamond samples for various experiments.

 

Jinfu Shu
Visiting Investigator
E-mail: jshu@ciw.edu
Phone: 202-478-8963

Jinfu Shu's research interests are in high pressure synchrotron x-ray single crystal studies, diamond inclusions, and micromineral studies. Jinfu earned his Ph.D. at Wuhan College of Geology in China in 1987.

 

Verena Starke
Visiting Investigator
E-mail: vstarke@ciw.edu
Phone: 202-478-8994

Verena Starke is a molecular biologist and microbial ecologist specializing in environmental microbiology. She developed a strong background in these fields during her masters’ research at the Philipps-University Marburg (Germany), and her Ph.D. dissertation at the University of Maryland (USA). Her main research interests lie in microbial ecology under changing environmental conditions. Particularly, she is interested in how microbial communities change along environmental gradients, and how the environment influences microbial community makeup.

 

Xiaowei Sun
Visiting Investigator
E-mail: sunxw_lzjtu@163.com

Xiaowei Sun is working with Alexander Goncharov as a visiting investigator. He is working on the predictions of high-pressure phase behavior including elastic optical melting and thermodynamic properties of the new potentially superhard materials from the aspects of theory and computer simulation, if possible combined with experimental design. He joins the Geophysical Laboratory from Lanzhou Jiaotong University and is also interested on the theoretical studies on properties of materials under extreme conditions of pressure and temperature.

 

Dimitri Sverjensky
Senior Visiting Investigator
E-mail: dsverjensky@ciw.edu
Phone: 202-478-7975

Dimitri Sverjensky is a Professor of Geochemistry in the Department of Earth and Planetary Sciences at the Johns Hopkins University. Professor Sverjensky received his B. Sc. degree with First Class Honors from the University of Sydney (Australia) in 1973 and a Ph.D. from Yale University in 1980. He has worked in the fields of economic geology, isotope geochemistry and theoretical aqueous solution chemistry. In recent years, his research has focused on integrating theoretical and experimental studies of the geochemistry of the mineral-water interface, mainly with applications to environmental geochemistry and to the role of surface chemistry in the origin of life. He has been a Visiting Investigator since 2005.

 

Mark Wasley
Visiting Investigator
E-mail: m.d.wasley@gmail.com

Mark Wasley joins the Geophysical Laboratory as a visitor from the University of Houston. He works with George Cody on various projects and is interested in genetics, gene editing/engineering and genetic sequencing.

 

Todd Zapata
Visiting Investigator
E-mail: todd-austin-zapata@neo.tamu.edu
Phone: 202-478-7963

Todd Zapata joins the Geophysical Laboratory as a visiting investigator from Texas A&M University.  He is researching materials under high pressure using diamond anvil cells with Viktor Struzhkin.

 

Xiao-Miao Zhao
Visiting Investigator
E-mail: xzhao@carnegiescience.edu

Xiamiao Zhao joins the Geophysical Laboratory from South China University of Technology as a visitor working with Alex Goncharov and Viktor Struzhkin. She is working on polycyclic hydrocarbons in connection with their possible superconducting properties, which will include structural determination, optical and resistivity measurements. You can find her in office A-G28A until the end of August.