Harold Y. Hwang

Last updated

Harold Yoonsung Hwang (born 4 August 1970 in Pasadena, California) is an American physicist, specializing in materials physics, condensed matter physics, nanoscience, and quantum engineering. [1] [2]

Contents

Education and career

Harold Hwang graduated in 1993 from MIT with B.S. in physics, as well as B.S. and M.S. in electrical engineering. He received in 1997 his Ph.D. from Princeton University with thesis advisor Nai Phuan Ong. At Bell Laboratories in New Jersey, Hwang was from 1994 to 1996 a research assistant and from 1996 to 2003 a member of the technical staff. At the department of advanced materials science and the department of applied physics at University of Tokyo in Kashiwa, Japan, he was from 2003 to 2008 an associate professor and from 2009 a full professor. From 2006 to 2007 he was also a visiting associate professor at the Institute for Chemical Research at Kyoto University. Since 2010, he has been a professor of physics at the department of applied physics at Stanford University and team leader of the Correlated Electron Research Group at the RIKEN Advanced Science Institute in Wakō, Saitama, Japan. [3]

Research

As a Ph.D. student, Hwang was part of a team that discovered that spin-polarized tunnel currents in polycrystalline manganates produce very high magnetoresistances. [4] During his time at Bell Laboratories, his team developed methods for studying the "nature and length scales of charge screening in complex oxides" and how "short-length-scale electronic response can be probed and incorporated in thin-film oxide heterostructures" [5] and also pointed out a two-dimensional metallic state at the interface between the band insulators LaAlO3 and SrTiO3. [6] Subsequently, his team did research on phenomena which emerge at interfaces between oxide materials. [7]

An article that Hwang co-authored with Jan Hendrik Schön and two other physicists was published in April 2001 in the journal Science, but was retracted in November 2002. [8]

Awards and honors

In 2005 he received the Materials Research Society Outstanding Young Investigator Award. In 2008 he received the IBM Japan Science Prize [9] and in 2013 the Ho-Am Prize in Science in Science. [10] [11] On 18th June 2014 he received, together with Jochen Mannhart and Jean-Marc Triscone, the Europhysics Prize of the Condensed Matter Division of the European Physical Society. [12] In 2011 he was elected a fellow of American Physical Society. [13]

Related Research Articles

<span class="mw-page-title-main">High-temperature superconductivity</span> Superconductive behavior at temperatures much higher than absolute zero

High-temperature superconductors are defined as materials with critical temperature above 77 K, the boiling point of liquid nitrogen. They are only "high-temperature" relative to previously known superconductors, which function at even colder temperatures, close to absolute zero. The "high temperatures" are still far below ambient, and therefore require cooling. The first breakthrough of high-temperature superconductor was discovered in 1986 by IBM researchers Georg Bednorz and K. Alex Müller. Although the critical temperature is around 35.1 K, this new type of superconductor was readily modified by Ching-Wu Chu to make the first high-temperature superconductor with critical temperature 93 K. Bednorz and Müller were awarded the Nobel Prize in Physics in 1987 "for their important break-through in the discovery of superconductivity in ceramic materials". Most high-Tc materials are type-II superconductors.

<span class="mw-page-title-main">Perovskite (structure)</span> Type of crystal structure

A perovskite is any material with a crystal structure following the formula ABX3, which was first discovered as the mineral called perovskite, which consists of calcium titanium oxide (CaTiO3). The mineral was first discovered in the Ural mountains of Russia by Gustav Rose in 1839 and named after Russian mineralogist L. A. Perovski (1792–1856). 'A' and 'B' are two positively charged ions (i.e. cations), often of very different sizes, and X is a negatively charged ion (an anion, frequently oxide) that bonds to both cations. The 'A' atoms are generally larger than the 'B' atoms. The ideal cubic structure has the B cation in 6-fold coordination, surrounded by an octahedron of anions, and the A cation in 12-fold cuboctahedral coordination. Additional perovskite forms may exist where either/both the A and B sites have a configuration of A1x-1A2x and/or B1y-1B2y and the X may deviate from the ideal coordination configuration as ions within the A and B sites undergo changes in their oxidation states.

The Schön scandal concerns German physicist Jan Hendrik Schön who briefly rose to prominence after a series of apparently successful experiments with semiconductors that were discovered later to be fraudulent. Before he was exposed, Schön had received the Otto-Klung-Weberbank Prize for Physics and the Braunschweig Prize in 2001, as well as the Outstanding Young Investigator Award of the Materials Research Society in 2002, all of which were later rescinded.

<span class="mw-page-title-main">Albert Fert</span> French physicist (born 1938)

Albert Fert is a French physicist and one of the discoverers of giant magnetoresistance which brought about a breakthrough in gigabyte hard disks. Currently, he is an emeritus professor at Paris-Saclay University in Orsay, scientific director of a joint laboratory between the Centre national de la recherche scientifique and Thales Group, and adjunct professor at Michigan State University. He was awarded the 2007 Nobel Prize in Physics together with Peter Grünberg.

A two-dimensional electron gas (2DEG) is a scientific model in solid-state physics. It is an electron gas that is free to move in two dimensions, but tightly confined in the third. This tight confinement leads to quantized energy levels for motion in the third direction, which can then be ignored for most problems. Thus the electrons appear to be a 2D sheet embedded in a 3D world. The analogous construct of holes is called a two-dimensional hole gas (2DHG), and such systems have many useful and interesting properties.

Arthur Foster Hebard is Distinguished Professor of Physics at University of Florida in Gainesville, Florida. He is particularly noted for leading the discovery of superconductivity in Buckminsterfullerene in 1991.

Kathryn Ann Moler is an American physicist, and current dean of research at Stanford University. She received her BSc (1988) and Ph.D. (1995) from Stanford University. After working as a visiting scientist at IBM T.J. Watson Research Center in 1995, she held a postdoctoral position at Princeton University from 1995 to 1998. She joined the faculty of Stanford University in 1998, and became an Associate in CIFAR's Superconductivity Program in 2000. She became an associate professor at Stanford in 2002 and is currently a professor of applied physics and of Physics at Stanford. She currently works in the Geballe Laboratory for Advanced Materials (GLAM), and is the director of the Center for Probing the Nanoscale (CPN), a National Science Foundation-funded center where Stanford and IBM scientists continue to improve scanning probe methods for measuring, imaging, and controlling nanoscale phenomena. She lists her scientific interests and main areas of research and experimentation as:

Donhee Ham is the John A. and Elizabeth S. Armstrong Professor of Engineering and Applied Sciences at Harvard University and Fellow of Samsung Electronics.

<span class="mw-page-title-main">Philip H. Bucksbaum</span> American atomic physicist

Philip H. Bucksbaum is an American atomic physicist, the Marguerite Blake Wilbur Professor in Natural Science in the Departments of Physics, Applied Physics, and Photon Science at Stanford University and the SLAC National Accelerator Laboratory. He also directs the Stanford PULSE Institute.

<span class="mw-page-title-main">Lanthanum aluminate-strontium titanate interface</span>

The interface between lanthanum aluminate (LaAlO3) and strontium titanate (SrTiO3) is a notable materials interface because it exhibits properties not found in its constituent materials. Individually, LaAlO3 and SrTiO3 are non-magnetic insulators, yet LaAlO3/SrTiO3 interfaces can exhibit electrical metallic conductivity, superconductivity, ferromagnetism, large negative in-plane magnetoresistance, and giant persistent photoconductivity. The study of how these properties emerge at the LaAlO3/SrTiO3 interface is a growing area of research in condensed matter physics.

Bernhard Keimer is a German physicist and Director at the Max Planck Institute for Solid State Research. His research group uses spectroscopic methods to explore quantum many-body phenomena in correlated-electron materials and metal-oxide heterostructures.

Jochen Mannhart is a German physicist.

Lanthanum aluminate is an inorganic compound with the formula LaAlO3, often abbreviated as LAO. It is an optically transparent ceramic oxide with a distorted perovskite structure.

Chen Xianhui is a Chinese physicist. He is a Changjiang professor of physics of the University of Science and Technology of China (USTC). He was elected an academician of the Chinese Academy of Sciences (CAS) in 2015 and is known for his breakthroughs on iron-based superconductors. He won the State Natural Science Award with Zhao Zhongxian and others in 2013 and the Bernd T. Matthias Prize for Superconducting Materials in 2015. His research is mainly on experimental condensed matter physics and materials science.

Karen Chan is an associate professor at the Technical University of Denmark. She is a Canadian and French physicist most notable for her work on catalysis, electrocatalysis, and electrochemical reduction of carbon dioxide.

Yang Shao-Horn is a Chinese American scholar, Professor of Mechanical Engineering and Materials Science and Engineering and a member of Research Laboratory of Electronics at the Massachusetts Institute of Technology. She is known for research on understanding and controlling of processes for storing electrons in chemical bonds towards zero-carbon energy and chemicals.

<span class="mw-page-title-main">Dragan Damjanovic</span> Swiss-Bosnian-Herzegovinian materials scientist

Dragan Damjanovic is a Swiss-Bosnian-Herzegovinian materials scientist. From 2008 to 2022, he was a professor of material sciences at EPFL and head of the Group for Ferroelectrics and Functional Oxides.

Alexander Wu Chao is a Taiwanese-American physicist, specializing in accelerator physics.

<span class="mw-page-title-main">Jeremy Levy</span> American physicist

Jeremy Levy is an American physicist who is a Distinguished Professor of Physics at the University of Pittsburgh.

Elbio Rubén Dagotto is an Argentinian-American theoretical physicist and academic. He is a distinguished professor in the department of physics and astronomy at the University of Tennessee, Knoxville, and Distinguished Scientist in the Materials Science and Technology Division at the Oak Ridge National Laboratory.

References

  1. "Harold Y. Hwang". Department of Applied Physics, Stanford University. (with list of selected publications)
  2. "Harold Y. Hwang". SIMES, Stanford Institute for Materials & Energy.
  3. "Harold Y. Hwang, 界面 の 構造 と 制 御 - 研究者 (Interface structure and control-Researcher)". jst.go.jp.
  4. H. Y. Hwang; S.-W. Cheong; N. P. Ong; B. Batlogg (2 September 1996). "Spin-Polarized Intergrain Tunneling in La2/3Sr1/3MnO3". Physical Review Letters. 77 (10): 2041–2044. Bibcode:1996PhRvL..77.2041H. doi:10.1103/PhysRevLett.77.2041. PMID   10061842.
  5. A. Ohtomo; D. A. Muller; J. L. Grazul; H. Y. Hwang (26 September 2002). "Artificial charge-modulation in atomic-scale perovskite titanate superlattices". Nature. 419 (6905): 378–380. Bibcode:2002Natur.419..378O. doi:10.1038/nature00977. ISSN   0028-0836. PMID   12353030. S2CID   4409974.
  6. A. Ohtomo; H. Y. Hwang (29 January 2004). "A high-mobility electron gas at the LaAlO3 / SrTiO3 heterointerface". Nature. 427 (6973): 423–426. Bibcode:2004Natur.427..423O. doi:10.1038/nature02308. ISSN   0028-0836. PMID   14749825. S2CID   4419873.
  7. H. Y. Hwang; Y. Iwasa; M. Kawasaki; B. Keimer; N. Nagaosa (24 January 2012). "Emergent phenomena at oxide interfaces". Nature Materials. 11 (2): 103–113. Bibcode:2012NatMa..11..103H. doi:10.1038/nmat3223. ISSN   1476-1122. PMID   22270825. S2CID   10597176.
  8. Schon, J. H.; et al. (2001). "Josephson Junctions with Tunable Weak Links". Science. 292 (5515): 252–254. Bibcode:2001Sci...292..252H. doi:10.1126/science.1058812. ISSN   0036-8075. PMID   11303093. S2CID   38719808. (Retracted, see doi:10.1126/science.298.5595.961b, PMID   12416506 . If this is an intentional citation to a retracted paper, please replace {{ retracted |...}} with {{ retracted |...|intentional=yes}}.)
  9. "Special Colloquium: Harold Y. Hwang". Department of Physics, Zhejiang University. 15 November 2018.
  10. "Harold Hwang Wins Top Korean Award". SLAC National Accelerator Laboratory. 16 April 2013.
  11. Samsung Announces 2013 Ho-Am Prize Winners | Samsung Official Blog: Samsung Village, 2016-10-12, archived from the original on 2016-10-12
  12. "Harold Hwang wins prestigious European physics prize". The Dish, Stanford News. 18 June 2014.
  13. "American Physical Society Names Prof. Harold Hwang a Fellow". SLAC National Accelerator Laboratory. 29 November 2011.