The Rutgers Center for Emergent Materials supports inter-institutional collaborative research programs on scientifically important and technologically relavent materials among Rutgers University, NJIT and industrial laboratories throughout New Jersey. RCEM also fosters interdisciplinary education for postdoctoral fellows, graduate and undergraduate students as well as high school students.
It is often said that an open mind can see a universe in a drop of water. In science, a poetic phrase sometimes becomes reality. In our work, we were able to study the laws governing such disparate phenomena as evolution of the early Universe, superfluidity, and exotic superconductivity in a piece of a solid material called manganite. Our samples are ferroelectric, i.e. they exhibit spontaneous electric polarization that might vary from place to place, breaking the samples into domains. The domains can organize into topological entities called vortices (similar to a vortex in a liquid). Such topological entities form in cosmological structures, in particle physics, and in solids. They are governed by a similar "universal" law, and a study of a ferroelectric, for example, can elucidate the characteristics of the early Universe.
Topological vortices are often elusive and difficult to study (think the early Universe). We have discovered an ingenious and effective way of freezing and subsequently imaging the topological vortices in ferroelectric manganites, and studied the dynamics associated with their formation. We found that it is in close agreement with the well-known Kibble-Zurek mechanism, which was developed to describe topological defects such as monopoles or cosmic strings that influence the evolution of the early Universe.
Even if a single phenomenon is chosen from the proverbial drop of water, it can be seen differently by different people. A flock of flying geese can be also viewed as a school of fish in an M. C. Escher's artwork. Such "duality" has fascinated people for centuries. In our studies, we constructed such a dual vision of the vortices in our ferroelectric sample, and tested it in experiments. We described the same phenomena using the language of emergence of the ferroelectric order at low temperatures (one description), and also in the language of condensation of the disorder associated with vortices taking over the sample, spanning their entire length, and destroying the order (the dual description). Thus, one event was seen from two entirely different sides - the order and the disorder sides - as also often found in the works of art. Not surprisingly, such a broadened view allows seeing more: the vortices in our samples, exotic superfluids, and even the recently discovered Higgs boson (an elementary particle) can be described in a similar language. Studying one therefore means understanding another. Quite a feat for an unassuming little chunk of solid matter called manganite!
--Sang-Wook Cheong and Valery Kiryukhin, Rutgers
12AugProfessor Sang-Wook Cheong among "The Most Influential Scientific Minds: 2014"
10JunStory on Color Theorem in Materials for Phys.org (PDF version)
09AprThe NSF Designing Materials to Revolutionize and Engineer our Future (DMREF) meeting will be held on Apr. 10-11. (Schedule)
03AprWe announce the start of RCEM Journal Club. Speakers from Physics, Chemistry and Material Science, from both inside and outside of RCEM, will review research papers and various interesting topics in condensed matter physics.
07MarOn APS March Meeting 2014, RCEM members presented 3 invited talks on the studies of vortices of hexagonal manganite and iridium ditelluride.
24FebAs of Feburary, 2014, there are 157 papers associated with Rutgers Center for Emergent Materials, since 2006 (the year when RCEM was founded), with more than 2600 citations, based on the search results of "Web of Science".
01DecProfessor Weida Wu's group presents the application of a magnetoelectric force microscopy technique that combines magnetic force microscopy with in situ modulating high electric fields. Direct visualization of magnetoelectric domains, Nature Materials 13, 163–167 (2014)
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24FebWe are proud to announce that graduate student Young Jai Choi has been awarded the Iris Ovshinsky Student Travel Award for Material Physics. Choi, known for his work in the Rutgers Center for Emergent Materials, has been given this award to recognize his work in research of novel multiferroic materials. There will be an award ceremony in Pittsburgh, PA on March 17th, 2009 where Choi will give a talk on his work. Among the benefits are a stipend and a diploma honoring achievments in the field of Material Physics.
Ho-Am Foundation yesterday announced five winners of its Ho-Am Prize, one of the most prestigious awards that honors Koreans and foreigners for their achievements or services.
This year`s winners are Cheong Sang-wook, a professor at Rutgers University and POSTECH; Eom Chang-beom, a professor at University of Wisconsin-Madison; Charles D. Surh, a professor at The Scripps Research Institute; novelist Lee Cheong-joon; and Emma Freisinger, an Austrian who helped Korean leprosy patients.
The foundation, set up in memory of the late Lee Byung-chull, founder of Samsung Group, presents the annual award to "those who have made outstanding contributions to the development of science and culture and the enhancement of the welfare of mankind." Cheong, the winner of the Science Prize, has provided a new paradigm in the field of physical properties of emergent materials and discovered the high tunability of electric polarization by external magnetic fields in multiferroics where ferroelectric and magnetic orders coexist, the foundation said.
Eom will receive the Engineering Award for pioneering work researching various cutting-edge materials in the field of non-volatile memories, the next generation optical and medical sensors, as well as electronic and communication devices, it said.
Surh was named for the Medicine Prize for establishing a new chapter in the cure of the immune system through "works on the selection of young T cells in the thymus and the factors controlling mature T cell survival in the extrathymic environment," the foundation said.
Novelist Lee, the winner of the Arts Prize, was recognized for his contribution to improving the quality of Korean literature by writing more than 100 stories, 13 novels, and over 30 books featuring collections of his work over the past 42 years.
Emma Freisinger, an Austrian, was named for the Community Service Prize for her 46-year long service assisting Korean leprosy patients since she came to Korea in 1961.
The five will receive a cash prize of 200 million won each and a gold medal at the award ceremony scheduled for June 1 at Hoam Art Hall in Seoul.
By Kim Yoon-mi (email@example.com)