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Highlights

Highlights

Superatom Regiochemistry Dictates the Assembly and Surface Reactivity of a Two-Dimensional Material
Superatom Regiochemistry Dictates the Assembly and Surface Reactivity of a Two-Dimensional Material
May 14, 2022
Big Idea: Quantum Leap

Superatom Regiochemistry Dictates the Assembly and Surface Reactivity of a Two-Dimensional Material

Colin Nuckolls, Xavier Roy, Columbia University Center for Precision-Assembled Quantum Materials
The area of two-dimensional (2D) materials research would benefit greatly from the development of synthetically tunable van der Waals (vdW) materials. While the bottom-up synthesis of 2D frameworks from nanoscale building blocks holds great promise in this quest, there are many remaining hurdles, including the design of building blocks that reliably produce 2D lattices and the growth of macroscopic crystals that can be exfoliated to produce 2D materials.
Crossover between strongly coupled and weakly coupled exciton superfluids
Crossover between strongly coupled and weakly coupled exciton superfluids
May 14, 2022
Big Idea: Quantum Leap

Crossover between strongly coupled and weakly coupled exciton superfluids

Cory Dean, Columbia University Center for Precision-Assembled Quantum Materials (PAQM)
We studied graphene double layers separated by an atomically thin insulator. Under applied magnetic field, electrons and holes couple across the barrier to form bound magneto-excitons. Using temperature-dependent Coulomb drag and counterflow current measurements, we were able to tune the magneto-exciton condensate through the entire phase diagram from weak to strong coupling.
On the left is a figure of a honeycomb type lattice of points. On the right is a set of plots of electrical resistance of the material as a function of the magnetic field. The curves all pass close to the origin of the axes. Some are nearly flat, and some look like a step.
On the left is a figure of a honeycomb type lattice of points. On the right is a set of plots of electrical resistance of the material as a function of the magnetic field. The curves all pass close to the origin of the axes. Some are nearly flat, and some look like a step.
May 12, 2022
Big Idea: Growing Convergence Research

Quantum anomalous Hall effect in atomically-thin semiconductor layers

Analogous to a superconductor, the quantum anomalous Hall effect can transport electrons in a sample without dissipating any energy. The effect has been proposed as an important element for quantum circuitry, quantum computing and a standard for fundamental constants of physics. Unfortunately, it often emerges only at temperatures near absolute zero (~ 0.1 K).
Materials indicated at the top right are grown as wafers (top left). A wafer of material is grown in a cylindrical chemical reactor. Wafers of different materials grown in the reactor are patterned into small pieces called pixels. They are then patterned into pixels and assembled into arbitrary combinations. Structures that look like a checkerboard pattern can be made. Each square in the board has a different sequence of material layers. The absorption of light can be measured in each of the squares to learn about the material in that square.
Materials indicated at the top right are grown as wafers (top left). A wafer of material is grown in a cylindrical chemical reactor. Wafers of different materials grown in the reactor are patterned into small pieces called pixels. They are then patterned into pixels and assembled into arbitrary combinations. Structures that look like a checkerboard pattern can be made. Each square in the board has a different sequence of material layers. The absorption of light can be measured in each of the squares to learn about the material in that square.
May 12, 2022
Big Idea: Future of Work at the Human-Technology Frontier, Materials Under Extreme Conditions

Robotic Pixel Assembly of Atomically-Thin Materials

As new methods are established to synthesize atomically-thin quantum materials, it becomes necessary to develop a technique to take those materials and assemble them into complex structures.
Colorimetric Quantification of Linking in Thermoreversible Nanocrystal Gel Assemblies
Colorimetric Quantification of Linking in Thermoreversible Nanocrystal Gel Assemblies
May 12, 2022
University of Texas at Austin

Colorimetric Quantification of Linking in Thermoreversible Nanocrystal Gel Assemblies

D. Milliron, E. Anslyn, T. Truskett: Univ. of Texas at Austin
This highlight demonstrates the gelation assembly of colloidal nanocrystals using uniquely developed ligands that can form a metal coordination linkage. Metal ions that are paired with ligand functional groups were used to control the assembly of nanocrystals from a stable dispersion to full spanning gel networks. The metal coordination linkage was reversed using temperature as an external trigger and enabled thermally switchable nanocrystal gel networks.
CDCM Industrial Mentorship Program Prepares Students for the Workforce of Tomorrow
CDCM Industrial Mentorship Program Prepares Students for the Workforce of Tomorrow
May 12, 2022
University of Texas at Austin

CDCM Industrial Mentorship Program Prepares Students for the Workforce of Tomorrow

The Industrial Mentorship Program connects undergraduate students, graduate students and post-doctoral fellows to a mentor in industry. This program is designed to expose participants to fundamental research as it relates to societal and economic development; enable them to broaden their networks; and facilitate a successful transition into the workforce.
Temporally and Spatially Resolved Carrier Dynamics in Organic-Inorganic Hybrid Perovskites
Temporally and Spatially Resolved Carrier Dynamics in Organic-Inorganic Hybrid Perovskites
May 12, 2022
Big Idea: Quantum Leap

Temporally and Spatially Resolved Carrier Dynamics in Organic-Inorganic Hybrid Perovskites

This highlight illustrates a key characterization advance realized at the Center for Dynamics and Control of Materials – temporally resolved light-induced microwave impedance microscopy. 
Z. Shen, K. Luo, S. J. Park, D. Li, M. Mahanthappa, F. S. Bates, K. D. Dorfman, T. P. Lodge & J. I. Siepmann, JACS Au (2022) submitted for publication
Z. Shen, K. Luo, S. J. Park, D. Li, M. Mahanthappa, F. S. Bates, K. D. Dorfman, T. P. Lodge & J. I. Siepmann, JACS Au (2022) submitted for publication
May 10, 2022
UMN Materials Research Science and Engineering Center

Stabilizing A Double Gyroid Network Phase by Blending of LAM and CYL Forming Block Oligomers

Z. Shen, K. Luo, S. Park, D. Li, M. Mahanthappa, F. Bates, K. Dorfman, T. Lodge, I. Siepmann, University of Minnesota
Based on the hypothesis that blending LAM- and CYL-forming block oligomers may yield stable network phases, molecular dynamics simulations are used to study binary blend self-assembly of AB-type diblock (n-tridecan-1,2,3,4-tetraol) and AB2-type miktoarm (5-octyl-tridecan-1,2,3,4-tetraol)  amphiphiles. The AB2-rich and AB-rich blends form double gyroid (DG) networks and perforated lamellae (PL), respectively.
H. Yun, A. Prakash, T. Birol, B. Jalan and K.A. Mkhoyan, Nano Lett. 21, 4357-4364 (2021)
H. Yun, A. Prakash, T. Birol, B. Jalan and K.A. Mkhoyan, Nano Lett. 21, 4357-4364 (2021)
May 10, 2022
UMN Materials Research Science and Engineering Center

Dopant Segregation at Dislocations in an Emerging Oxide Semiconductor

Andre Mkhoyan, Bharat Jalan, Turan Birol, University of Minnesota
Emerging semiconductors such as tin-based oxides have enormous application potential in devices, as they are transparent, support highly mobile electrons, and have wide “energy gaps”. Unlike better developed semiconductors, however, these materials are prone to harboring defects, which can limit essential properties such as electron mobility.
Host matrix engineering for enhanced molecular qubit coherence
Host matrix engineering for enhanced molecular qubit coherence
May 9, 2022
Big Idea: Quantum Leap

Host matrix engineering for enhanced molecular qubit coherence

Samuel L. Bayless (University of Chicago), Pratiti Deb (University of Chicago), Daniel W. Laorenza (MIT), Mykyta Onizhuk (University of Chicago), Giulia Galli (University of Chicago, Argonne National Lab), Danna E. Freedman (MIT), David D. Awschalom (University of Chicago, Argonne National Lab)  
At the University of Chicago MRSEC, we demonstrate that controlling the molecular crystal hosting the active qubit is a powerful means for enhancing coherence.

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