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WELCOME TO DEL-LABS

Directing Electrons with Light

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LATEST NEWS

05/2023

Congratulations to Ding for being awarded the prestigious Kathy Chen Fellowship for excellence in Chemistry! And congratulations to Paul for being awarded the Miller Teaching Award! Both very well deserved.

04/2023

Arkajit and Ding's paper on the development of a microscopic theory of multimode polariton dispersion appears in Nano Letters, an important paper detailing the correct use of coupled oscillator type models for multi-mode microcavities.

1/2023

We're excited that Columbia undergraduate student Kayla Pham is joining the group!

11/2022

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.

11/2022

The group is excited to welcome graduate students Andrea Dai and Michelle Reynoso!

08/2022

Vicky and Ding give talks at SPIE San Diego on their work on dark exciton and polariton transport.

07/2022

Jeyson Cruz Felix joins us for the summer high school ENG program from Gregorio Luperon High School - welcome Jeyson!

06/2022

Milan receives the Beckman Young Investigator award - thank you to the Arnold and Mabel Beckman Foundation!

Read all news here.

Home: Latest News
RESEARCH

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.

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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.

Home: Research

Super-resolution imaging

of electronic transport and material energy landscapes

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Optical control of nuclear-electronic coupling and energy flow on material mesoscales

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Optical manipulation of strongly correlated electronic behavior with confined light

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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.

THE TEAM

Home: The Team
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SHAN-WEN CHENG

Graduate Student
 

sc4603@columbia.edu

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VICKY (HAOWEN) SU

Graduate Student
 

hs3140@columbia.edu

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MILAN DELOR

Assistant Professor
and Principal Investigator

 

milan.delor@columbia.edu

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

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DING XU

Graduate Student
 

dx2192@columbia.edu

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JACK TULYAG

Graduate Student
 

jack.tulyag@columbia.edu

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INKI LEE

Graduate Student
 

inki.lee@columbia.edu

BSc Chemistry, 2014-2019

Wuhan University

​Visiting researcher, North Carolina
State University

BS Chemistry & Physics, 2016-2020

University of California, Los Angeles

BS Chemistry, 2016-2020

University of Texas at Austin

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JAMES BAXTER

Postdoc
 

jmb2493@columbia.edu

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PAUL BROWN

Graduate Student
 

ptb2119@columbia.edu

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ANDREA DAI

Graduate Student
 

ad4033@columbia.edu

PhD Chemistry, 2017-2021

Imperial College London (U.K.)

BS Materials Science, 2017-2021

Northwestern University

BS Chemistry, 2014-2018

MEd Curriculum and Instruction, 2018-2019

University of Maryland, College Park

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MICHELLE REYNOSO

Graduate Student
 

mer2261@columbia.edu

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YONGSEOK HONG

Postdoc
 

yh3593@columbia.edu

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KAYLA PHAM

Undergraduate Student
 

kp2998@columbia.edu

BS Chemistry, 2018-2022

Bard College

PhD Chemistry, 2015-2021

Yonsei University (South Korea)

BA Chemistry 2022 -

Columbia University

Read more about the team here.

Alumni page.

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.

SELECTED PUBLICATIONS

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.

Home: Publications
Home: Contact

CONTACT

Columbia University
Department of Chemistry
3000 Broadway, 117 Havemeyer Hall
New York, NY 10027

Office: 506 Havemeyer

Lab: 117 Havemeyer

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