Machine Intelligence and Computational Chemistry Lab

AI & Quantum Simulations

Research focus

  • AI for Chemical Discovery

  • AI for Synthesis

  • Materials Understanding

  • Electronic structure methods


Discovery of new molecules and materials with desired properties is a practical goal of chemical research. A promising way to significantly accelerate the latter process is to incorporate all available knowledge and data to plan the synthesis of the next materials. Our group focuses on developing computational methods and algorithms to discover new materials for a wide spectrum of applications 10x faster using the state-of-the-art machine learning algorithms and artificial intelligence to go beyond the human intuitions. We predict the properties of chemicals and materials, explore the chemical space for inverse design, and predict the synthesis pathways ahead of experiments based on data. These efforts are complemented by the quantum mechanical and molecular mechanical simulations that provide atomistic snapshots of what is happening at the microscopic scale in the materials. Our current research interests can be categorized into four areas broadly defined as
1) developing AI methods for novel chemical discovery,
2) developing AI methods for automated chemical synthesis,
3) atomic-scale understanding and designing of functional molecules and materials, and
4) developing fast and accurate electronic structure methods that can treat large molecules and materials more reliably.

AI for Chemical Discovery

Developing high-performance advanced materials requires a deeper insight and search into the chemical space. Until recently, exploration of materials space using chemical intuitions built upon existing materials has been the general strategy, but this direct design approach is often time and resource consuming and poses a significant bottleneck to solve the materials challenges of future sustainability in a timely manner. To accelerate this conventional design process, inverse design, which outputs materials with pre-defined target properties, has emerged as a significant materials informatics platform in recent years by leveraging hidden knowledge obtained from materials data. These include AI-based property predictions that can facilitate fast screening of the database for different applications, or inverse design based on generative models.

Recent publications

(1) Path-aware and structure-preserving generation of synthetically accessible molecules
 J. Noh, D. Jeong, K. Kim, S. Han, M. Lee, H. Lee, Y. Jung*
ICML 2022 162:16952-16968
(2) Automated Exploitation of the Big Configuration Space of Large Adsorbates on Transition Metals Reveals Chemistry Feasibility
 G. Gu*, M. Lee, Y. Jung*, D. G. Vlachos*
Nat Commun 2022 13, 2087
(3) Autobifunctional Mechanism of Jagged Pt Nanowires for Hydrogen Evolution Kinetics via End-to-End Simulation
 G. Gu, J. Lim, C. Wan, T. Cheng, H. Pu, S. Kim, J. Noh, C. Choi, J. Kim, W. Goddard*, X. Duan*, Y. Jung*
J Am Chem Soc 2021 143 14 5355-5363
(4) Generative Adversarial Networks for Crystal Structure Prediction
 S. Kim†, J. Noh†, G. Gu, A. Aspuru-Guzik, Y. Jung* (†equal contribution)
ACS Cent Sci 2020 6 8 1412-1420
(5) Machine-Enabled Inverse Design of Inorganic Solid Materials: Promises and Challenges
 J. Noh, G. Gu, S. Kim, Y. Jung*
Chem Sci (invited review) 2020 11 4871-4881
(6) Inverse Design of Solid State Materials via a Continuous Representation
 J. Noh, J. Kim, H. S. Stein, B. Sanchez-Lengeling, J. M. Gregoire, A. Aspuru-Guzik*, Y. Jung*
Matter 2019 1 1370-1384

AI for Synthesis

One great challenge in digital discovery is that many of the molecules and materials that are computationally designed are often discarded in the laboratories since they are not synthesizable. There are some widely employed approximate approaches to estimate synthesizability, such as the thermodynamic stability, but they could produce too many potentially synthesizable candidates or miss important metastable materials. The synthesis being a complex phenomenon, simple thermodynamic stability alone or other heuristic rules may not be able to yield reliable prediction capability. Our work in this area is related to predict the materials synthesizability, molecular and inorganic retrosynthesis, organic reactivity prediction, and synthesis-aware molecule generation. Automating the process of synthesis by artificial intelligence would accelerate synthesis design in future digital laboratories.

Recent publications

(1) Predicting Synthesis Recipes of Inorganic Crystal Materials using Elementwise Template Formulation
 S. Kim, J. Noh, G. H. Gu, S. Chen, Y. Jung*
Chem. Sci. 2023 15, 1039-1045
(2) A generalized-template-based graph neural network for accurate organic reactivity prediction
 S. Chen and Y. Jung*
Nat Mach Intell 2022 4, 772–780
(3) Perovskite Synthesizability using Graph Neural Networks
 G. Gu†, J. Jang†, J. Noh†, A. Walsh, Y. Jung*
npj Comput Mater 2022 8, 71
(4) Deep Retrosynthetic Reaction Prediction using Local Reactivity and Global Attention
 S. Chen and Y. Jung*
JACS Au 2021 1 10 1612-1620
(5) Predicting Potentially Hazardous Chemical Reactions Using Explainable Neural Network
 J. Kim†, G. Gu†, J. Noh†, S. Kim, S. Gim, J. Choi*, Y. Jung* (†equal contribution)
Chem Sci 2021 12 11028-11037
(6) Structure-based Synthesizability Prediction of Crystals using Partially Supervised Learning
 J. Jang†, G. Gu†, J. Noh, J. Kim, Y. Jung* (†equal contribution)
J Am Chem Soc 2020 142 44 18836-18843

Materials Understanding

Despite exciting experimental progresses in synthesizing, characterizing, and visualizing the materials systems in a microscopic scale, obtaining full atomistic details and underlying mechanisms of many intriguing materials phenomena are still very challenging, making the directed materials design difficult. Computational modeling based on quantum mechanics and molecular mechanics offer significant opportunities to address these challenges by providing atomistic level behaviors of molecules and materials. Muliscale and statistical techniques can further bridge the gap between microscopic understanding and macroscopic experimental measurements. We aim to reveal materials design guidelines by the latter understanding and perform computational high-throughput virtual screening to rapidly explore the large chemical space in a systematic fashion, identifying promising materials candidates that can be tested experimentally

Recent publications

(1) Correlated Local Fluctuations in the Hydrogen Bond Network of Liquid Water
 Y. Yun, R. Z. Khaliullin, Y. Jung*
J Am Chem Soc 2022 144, 29, 13127–13136
(2) Understanding Potential-Dependent Competition Between Electrocatalytic Dinitrogen and Proton Reduction Reactions
 C. Choi, G. H. Gu, J. Noh, H. S. Park, Y. Jung*
Nat Commun 2021 12 4353
(3) Autobifunctional Mechanism of Jagged Pt Nanowires for Hydrogen Evolution Kinetics via End-to-End Simulation
 G. Gu, J. Lim, C. Wan, T. Cheng, H. Pu, S. Kim, J. Noh, C. Choi, J. Kim, W. Goddard*, X. Duan*, Y. Jung*
J Am Chem Soc 2021 143 14 5355-5363
(4) Electrochemical Ammonia Synthesis: Mechanistic Understanding and Catalyst Design
 H. Shen, C. Choi, J. Masa, X. Li, J. Qiu, Y. Jung*, Z. Sun*
Chem 2021 7 1-47
(5) Controlling hot electron flux and catalytic selectivity with nanoscale metal-oxide interfaces
 S. Lee†, J. Kim†, W. Park†, H. Lee, G. Lee, Y. Jung*, Y. Jung*, J. Park* (†equal contribution)
Nat Commun 2021 12 40
(6) Role of Intermediate Phase for Stable Cycling of Na7V4(P2O7)4PO4 in Sodium Ion Battery
 S. Y. Lim+, H. Kim+, J. Chung, J. Lee, B. Kim, J. Choi, K. Chung, W. Cho, S. Kim, W. Goddard*, Y. Jung*, J. W. Choi* (+: equal contribution)
Proc Natl Acad Sci 2014 111 599-604

Electronic structure methods

Accuracy and feasibility of modern computational modelling techniques based on quantum mechanics has progressed recently to a level that allows one to make reliable predictions ahead of experiments. However, these methods, such as those based on density functional theory, still scale unfavorably to treat large systems, or their accuracy is well-known to be insufficient for certain molecular or materials properties compared to correlated wavefunction-based methods. Our group develops new density functional methods that are fast and accurate to accelerate the computational material discovery even further.

Recent publications

(1) Software for the frontiers of quantum chemistry: An overview of developments in the Q-Chem 5 package
 E. Epifanovsky et al.
J Chem Phys 2021 155 084801
(2) A Local Environment Descriptor for Machine-Learned Density Functional Theory at the Generalized Gradient Approximation Level
 H. Ji, Y. Jung
J Chem Phys 2018 148 241742-241751
(3) Analytical Double-Hybrid Density Functional Based on the Polynomial Series Expansion of Adiabatic Connection: A Quadratic Approximation
 J.Kim and Y. Jung*
J Chem Theory Comp 2015 11 45-54
(4) A fast doubly hybrid density functional method close to chemical accuracy using a local opposite spin ansatz
 Y. Zhang, X. Xu*, Y. Jung*, W.A. Goddard*
Proc Natl Acad Sci 2011 108 19896-19900
(5) Accelerated purification using generalized non-purifying intermediate functions for large scale self-consistent field calculations
 J. Kim, Y. Jung*
J Chem Theor Comp (Letter) 2011 7 3853-3858
(6) Comment on "Inaccuracy of density functional theory calculations for dihydrogen binding energetics onto Ca cation centers"
 Y. Ohk, Y.-H. Kim*, Y. Jung*
Phys Rev Lett 2010 104 179601