WELCOME TO DEL-LABS
Directing Electrons with Light
We're excited that Columbia undergraduate student Kayla Pham is joining the group!
We're excited to welcome postdoc Yongseok Hong! Yongseok hails from Dongho Kim's group at Yonsei University where he performed beautiful ultrafast experiments on excitons in organic systems.
The group is excited to welcome graduate students Andrea Dai and Michelle Reynoso!
Vicky and Ding give talks at SPIE San Diego on their work on dark exciton and polariton transport.
Jeyson Cruz Felix joins us for the summer high school ENG program from Gregorio Luperon High School - welcome Jeyson!
Milan receives the Beckman Young Investigator award - thank you to the Arnold and Mabel Beckman Foundation!
Emma Charles from Howard University joins us for her REU this summer to work on microscopy of 2D materials - welcome Emma!
Congratulations to Shan-Wen and Jack for being awarded the Departmental Miller Teaching Awards!
Ding's opus on a new, powerful imaging approach to track coherent polariton propagation and interactions in cavities and 2D materials was just posted on arXiv!
Read all news here.
The efficient transport and interconversion of energy between photons, electrons, ions and heat underpins life on earth. In modern technologies ranging from solar panels to computers, batteries and health sensors, energy moves slowly, randomly and often inefficiently towards target conversion sites. We aim to direct energy flow in emerging materials in ways that are targeted and efficient, moving beyond random motion to unleash new paradigms for extracting more energy from solar panels, storing more energy in batteries, speeding up information transport and processing, and exploiting correlated electronic systems for new applications.
We use light as a powerful stimulus to initiate, image and control electronic behavior in emerging materials on extreme spatiotemporal scales. Questions we explore include:
How do we image individual electrons moving and interacting with their surroundings in material lattices?
How do we control the direction and speed at which energy packets move towards functional targets?
How do we unlock exotic emergent phenomena and exploit them in modern devices?
The ongoing explosion of discoveries in quantum, meta- and nanomaterials provides the perfect platform for us to answer these questions now.
of electronic transport and material energy landscapes
Optical control of nuclear-electronic coupling and energy flow on material mesoscales
Optical manipulation of strongly correlated electronic behavior with confined light
In the process of answering these questions, we invent new tools capable of non-invasively imaging events happening over femtoseconds to hours at the single-nanometer scale. These tools are often relevant to a broad range of scientific disciplines: think taking movies of self-assembling biological or material building blocks, of neurons emitting action potentials, and of non-dissipative electronic transport in superconductors.
In addition to gaining a deep fundamental understanding of light-matter interactions, students and postdocs in the group acquire experience in nonlinear optics, super-resolution microscopy, ultrafast visible, IR and terahertz spectroscopy, and materials design and characterization. We collaborate broadly with both theoretical and experimental research groups at Columbia and beyond.
and Principal Investigator
Postdoctoral scholar, 2016-2019
Ginsberg group, University of California, Berkeley
Doctoral Prize Fellow, 2015
PhD Physical Chemistry, 2010-2014
Weinstein group, University of Sheffield
BSc Chemistry, 2015-2019
National Taiwan University
BA Chemistry and Global Health, 2015-2019
Washington University in St. Louis
BSc Chemistry, 2014-2019
Visiting researcher, North Carolina
BS Chemistry & Physics, 2016-2020
University of California, Los Angeles
BS Chemistry, 2016-2020
University of Texas at Austin
PhD Chemistry, 2017-2021
Imperial College London (U.K.)
BS Materials Science, 2017-2021
BS Chemistry, 2014-2018
MEd Curriculum and Instruction, 2018-2019
University of Maryland, College Park
BS Chemistry, 2018-2022
PhD Chemistry, 2015-2021
Yonsei University (South Korea)
BA Chemistry 2022 -
Read more about the team here.
We continue to look for motivated students and postdocs interested in spectroscopy, microscopy and materials science to join the group. Postdoc candidates have a strong background in chemical physics or physical chemistry and experience with one or a combination of the following: ultrafast spectroscopy, super-resolution microscopy, quantum materials, nonlinear optics. Contact Milan for more information.
Xu D, Mandal A, Baxter J, Cheng SW, Lee I, Su H, Liu S, Reichman D, Delor M (2022). Ultrafast imaging of coherent polariton propagation and interactions. arXiv:2205.01176.
Su H, Xu D, Cheng SW, Li B, Liu S, Watanabe K, Taniguchi T, Hone J, Delor M (2022). Dark-exciton driven energy funneling into dielectric inhomogeneities in two-dimensional semiconductors. Nano Letters, vol. 22, pp. 2843-2850.
Delor M, Slavney A, Wolf N, Filip M, Neaton J, Karunadasa H, Ginsberg N (2020).
Carrier diffusion lengths exceeding 1 μm despite trap-limited transport in halide double perovskites
ACS Energy Letters, vol. 5, pp. 1337-1345.
Delor M, Weaver H, Yu Q, Ginsberg N (2020).
Imaging material functionality through 3D nanoscale tracking of energy flow
Nature Materials, vol. 19, pp. 56-62.
Delor M, Archer S, Keane T, Meijer A, Sazanovich I, Greetham G, Towrie M, Weinstein J (2017).
Directing the path of light-induced electron transfer at a molecular fork using vibrational excitation
Nature Chemistry, vol. 9, pp. 1099-1104.
Delor M, Keane T, Scattergood P, Sazanovich I, Towrie M, Meijer A, Weinstein J (2015).
On the mechanism of vibrational control of light-induced charge transfer in donor–bridge–acceptor assemblies
Nature Chemistry, vol.17, pp. 689-695.
Delor M, Scattergood P, Sazanovich I, Parker A, Greetham G, Meijer A, Towrie M, Weinstein J (2014).
Toward control of electron transfer in donor-acceptor molecules by bond-specific infrared excitation
Science, vol. 346, pp. 1492-1495.
Department of Chemistry
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