Rice researchers find ‘paradox’ in ground-state bilayers

Mixing and matching computational models of 2D materials led scientists at Rice University to the realization that excitons — quasiparticles that exist when electrons and holes briefly bind — can be manipulated in new and useful ways.

The researchers identified a small set of 2D compounds with similar atomic lattice dimensions that, when placed together, would allow excitons to form spontaneously. Generally, excitons happen when energy from light or electricity boosts electrons and holes into a higher state.

But in a few of the combinations predicted by Rice materials theorist Boris Yakobson and his team, excitons were observed stabilizing at the materials’ ground state. According to their determination, these excitons at their lowest energy state could condense into a superfluid-like phase. The discovery shows promise for electronic, spintronic and quantum computing applications.

The open-access study by Yakobson, graduate student Sunny Gupta and research scientist Alex Kutana, all of Rice’s 怎么加速访问国外网站, appears in 加速国外网页加速软件.

– See more at Rice News

Between an international pandemic and a dissertation defense from home, it’s a honeymoon they’ll never forget

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Their honeymoon was unique. Now, as the newlyweds adhere to social distancing guidelines put in place to combat the coronavirus pandemic, Nitant Gupta and Megha Sharma Gupta are spending plenty of quality time together at their new apartment in Houston.

“I am sure that Megha and I will cherish this for a long time,” Nitant said.

On March 11, the couple were married in Megha’s hometown of Udaipur, a joyous and well-attended occasion in one of India’s most beautiful cities. They were scheduled to return to the U.S. later in the month.

But with coronavirus spreading across the globe, the two graduate students quickly realized if they didn’t leave soon they might not be able to get back to Rice, where Nitant is pursuing his Ph.D. in material science.

– See more at Rice News

Rice University calculations show they could be highly useful for solar panels

One nanotube could be great for electronics applications, but there’s new evidence that two could be tops.

Rice University engineers already knew that size matters when using single-walled carbon nanotubes for their electrical properties. But until now, nobody had studied how electrons act when confronted with the Russian doll-like structure of multiwalled tubes.

The Rice lab of materials theorist Boris Yakobson has now calculated the impact of curvature of semiconducting double-wall carbon nanotubes on their flexoelectric voltage, a measure of electrical imbalance between the nanotube’s inner and outer walls.

This affects how suitable nested nanotube pairs may be for nanoelectronics applications, especially photovoltaics.

The theoretical research by Yakobson’s Brown School of Engineering group appears in the American Chemical Society journal Nano Letters.

– See more at Rice News

Nature paper reports making and moving large-scale hexagonal boron nitride

Step by step, scientists are figuring out new ways to extend Moore’s Law. The latest reveals a path toward integrated circuits with two-dimensional transistors.

A Rice University scientist and his collaborators in Taiwan and China reported in Nature today that they have successfully grown atom-thick sheets of hexagonal boron nitride (hBN) as two-inch diameter crystals across a wafer.

Surprisingly, they achieved the long-sought goal of making perfectly ordered crystals of hBN, a wide band gap semiconductor, by taking advantage of disorder among the meandering steps on a copper substrate. The random steps keep the hBN in line.

怎样加速国外网站 materials theorist Boris Yakobson is co-lead scientist on the study with Lain-Jong (Lance) Li of the Taiwan Semiconductor Manufacturing Co. (TSMC) and his team. Yakobson and Chih-Piao Chuu of TSMC performed theoretical analysis and first principles calculations to unravel the mechanisms of what their co-authors saw in experiments.

– See more at Rice News

Department of Energy’s Office of Science (BES) highlights our work with ORNL

Image courtesy of Oak Ridge National Laboratory

… Scientists use chemical vapor deposition to deposit WS₂ films on substrates that have first been lithographically patterned with three-dimensional features such as trenches and tori (donut shapes).

The team has developed a model that explains that the accelerated crystal growth caused by the strain is because of an increase in the number of sites at which new particles are deposited during film growth (nucleation). When the height of the donut or trench is too high (above 40 nm), the strain becomes too high, and the films crack to release the strain.

– See more at energy.gov

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• Rice News: Microscopic ‘donuts’ a treat for quantum tech
• K. Wang et al., “Strain tolerance of two-dimensional crystal growth on curved surfaces”, Sci. Adv. 5, eaav4028 (2024)

‘Green’ process promises pristine graphene in bulk using waste food, plastic and other materials

A new process introduced by the Rice University lab of chemist James Tour can turn bulk quantities of just about any carbon source into valuable graphene flakes. The process is quick and cheap; Tour said the “flash graphene” technique can convert a ton of coal, food waste or plastic into graphene for a fraction of the cost used by other bulk graphene-producing methods.

As reported in Nature, flash graphene is made in 10 milliseconds by heating carbon-containing materials to 3,000 Kelvin (about 5,000 degrees Fahrenheit). The source material can be nearly anything with carbon content. Food waste, plastic waste, petroleum coke, coal, wood clippings and biochar are prime candidates, Tour said. “With the present commercial price of graphene being $67,000 to $200,000 per ton, the prospects for this process look superb,” he said.

Atom-level simulations by Rice researcher and co-author Ksenia Bets confirmed that temperature is key to the material’s rapid formation.“It is amazing how state-of-the-art computer simulations, notoriously slow for observing such kinetics, reveal the details of high temperature-modulated atomic movements and transformation,” Bets said.

– See more at Rice News

Boris I. Yakobson, the Karl F. Hasselmann Chair of Engineering, Professor of Materials Science & NanoEngineering and of Chemistry, has been named a Highly Cited Researcher for 2024 in the Materials Science award category.

怎么加速国外app are among those who have demonstrated significant and broad influence reflected in their publication of multiple papers, highly cited by their peers over the course of the last decade.

These highly cited papers rank in the top 1% by citations for a chosen field or fields and year in Web of Science. Of the world’s population of scientists and social scientists, the Web of Science Group’s Highly Cited Researchers are one in 1,000.

The Highly Cited Researchers 2024 list from the Web of Science Group contributes to the identification of that small fraction of the researcher population that contributes disproportionately to extending the frontiers of knowledge and gaining for society innovations that make the world healthier, richer, more sustainable, and more secure.

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The Fall 2024 issue of the Rice Engineering Magazine [1] features our recent work on 2D materials for single photon emission (SPE).

Single photon emission by a solid-state source requires presence of a distinct 提升浏览国外网页速度, usually provided by point defects. In a recent Nano Lett., we note that a number of qualities offered by novel, two-dimensional materials, their all-surface openness and optical transparence, tighter quantum confinement, and reduced charge screening—are advantageous for achieving an ideal SPE. On the basis of first-principles calculations and point-group symmetry analysis, we have proposed a strategy  to design paramagnetic defect complex with reduced symmetry, meeting all the requirements for SPE: its electronic states are well isolated from the host material bands, belong to a majority spin eigenstate, and can be controllably excited by polarized light. The defect complex is thermodynamically stable and appears feasible for experimental realization to serve as an SPE-source, essential for quantum computing, with Re_MoV_S in MoS₂ as one of the most practical candidates.

[1] M. Williams, “Making light work of computing”, Rice Eng. Mag. (Fall 2024), 34-35 (2024)

– See more at Rice News

Rice scientists lead effort to improve manufacture of valuable 2D material

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A well-ordered lattice of silver atoms makes it possible to speed the growth of pristine borophene, the atom-thick allotrope of boron that so far can only form via synthesis by molecular-beam epitaxy (MBE).

By using a silver substrate and through careful manipulation of temperature and deposition rate, scientists have discovered they can grow elongated hexagon-shaped flakes of borophene. They suggested the use of a proper metal substrate could facilitate the growth of ultrathin, narrow borophene ribbons.

New work published in Science Advances by researchers at Rice and Northwestern universities, Nanjing University of Aeronautics and Astronautics and Argonne National Laboratory will help streamline the manufacture of the conductive material, which shows potential for use in wearable and transparent electronics, plasmonic sensors and energy storage.

– See more at Rice News

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When is a circle less stable than a jagged loop? Apparently when you’re talking about carbon nanotubes.

Rice University theoretical researchers have discovered that nanotubes with segregated sections of “zigzag” and “armchair” facets growing from a solid catalyst are far more energetically stable than a circular arrangement would be.

Under the right circumstances, they reported, the interface between a growing nanotube and its catalyst can reach its lowest-known energy state via the two-faced “什么加速器看国外网站” configuration, with a half-circle of zigzags opposite six armchairs.

The terms refer to the shape of the nanotube’s edge: A zigzag nanotube’s end looks like a saw tooth, while an armchair is like a row of seats with armrests. They are the basic edge configurations of the two-dimensional honeycomb of carbon atoms known as graphene (as well as other 2D materials) and determine many of the materials’ properties, especially electrical conductivity.

The Brown School of Engineering team of materials theorist Boris Yakobson, researcher and lead author Ksenia Bets and assistant research professor Evgeni Penev reported their results in the American Chemical Society journal ACS Nano.

– See more at Rice News

Rice, Oak Ridge scientists study potential of synthetic strain engineering in 2D materials

Dedicating dollars to “donuts,” scientists at Rice University are helping a national laboratory bring about a revolution in electronics and, perhaps, quantum computing.

By patterning nanoscale donuts into a two-dimensional crystal, researchers at 访问国外网站加速方法 and their colleagues, including theoretical scientists at Rice’s Brown School of Engineering, have achieved a new level of control over its electrical and optical properties.

As researchers eye nanoscale materials for applications like quantum information processing, a method to tailor them from the bottom up will make them more practical.

The research team, which includes Rice materials theorist Boris Yakobson and graduate students Nitant Gupta and Henry Yu, published its results in Science Advances.

– See more at Rice News

Sunny Gupta, a third-year graduate student in Yakobson’s Group, has been awarded the Nettie S. Autrey Fellowship for 2024–2024. This award is given to one Rice graduate student in either the School of Natural Sciences or the School of Engineering who has demonstrated outstanding achievement and promise, and pays a stipend over the coming academic year.

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Jincheng Lei, a fourth-year graduate student in Yakobson’s Group, has received the 2024 Franz and Frances Brotzen Fellowship Award from the MSNE Department. To honor Franz R. Brotzen, the Stanley C. Moore Professor Emeritus of Materials Science and a former dean of engineering, this fellowship was established by David Lee Davidson and his wife, Patricia, and to support an endowed fellowship for graduate students researching in the area of materials science.

Jincheng’s research focuses on the growth of 2D materials with specific focus on the reaction mechanisms during their growth. He uses DFT calculations and ab initio molecular dynamics simulations to provide detailed insights into the atomistic growth mechanism of MoS₂ monolayer. He also works on predicting novel properties and exploring potential applications of nanomaterials.

School of Engineering celebrates faculty and staff

The 2024 Outstanding Faculty Research Award is awarded to a faculty member who most contributed to highly impactful publications or publicly available software, based on research conducted at Rice and published/developed during the period January 1, 2014, to December 31, 2018.

Prof. Yakobson has 4 patents and has published ~350 journal papers with more than 32,000 citations and an h-index of 86. Among the 20 Rice faculty profiles on Google Scholar with highest total number of citations, he is one of the top-three with the highest citations growth, ~600/yr, for the period 2013–2017. Yakobson’s Research Group maintains a vivid research group website that has been visited over this period by ~25,000 users from ~110 countries, collecting ~100,000 pageviews.

This Award also culminates a period of exciting breakthroughs in the pursuit of novel low-dimensional nanomaterials, resulting from Yakobson’s more recent work (2013–2015) in the field of materials discovery.

Rice, Northwestern find new ways to image, characterize unique material

Graphene can come from graphite. But borophene? There’s no such thing as borite.

Unlike its carbon cousin, two-dimensional borophene can’t be reduced from a larger natural form. Bulk boron is usually only found in combination with other elements, and is certainly not layered, so borophene has to be made from the atoms up. Even then, the borophene you get may not be what you need.

For that reason, researchers at Rice and Northwestern universities have developed a method to view 2D borophene crystals, which can have many lattice configurations — called polymorphs — that in turn determine their characteristics.

Knowing how to achieve specific polymorphs could help manufacturers incorporate borophene with desirable electronic, thermal, optical and other physical properties into products.

Boris Yakobson, a materials physicist at Rice’s Brown School of Engineering, and materials scientist Mark Hersam of Northwestern led a team that not only discovered how to see the nanoscale structures of borophene lattices but also built theoretical models that helped characterize the crystalline forms.

Their results are published in Nature Communications.

– See more at Rice News