Please check our new group webpage!

Welcome to the Ultrafast NanoOptics Group!

We are interested in probing and controlling light-matter interactions in condensed matter systems, with an emphasis on novel physical phenomena emerging in nanoscale structures and quantum phenomena in novel low dimensional materials. We develop and employ novel optical spectroscopy that simultaneously achieves ultrabroadband energy tunability, polarization control, nanometer spatial resolution, and femtosecond temporal resolution.

We are affiliated with the Physics Department at the University of California, Berkeley; the Materials Sciences Division of Lawrence Berkeley National Laboratory, and the Kavli Energy NanoSciences Institute.

Lab News

December 2022: Yoseob’s work on studying the Charge Transfer Dynamics in MoSe2/hBN/WSe2 Heterostructures is published in Nano Letters! Congratulations!

August 2022: The collaborated work by Mit from the Louie group, Emma, and Zuocheng on intralayer charge-transfer moire exciton is published in Nature! Congratulations!

August 2022: Zuocheng’s paper on interlayer exciton insulator is published in Nature Physics! Congratulations!

May 2022: Emma and Danqing’s review paper collaborated with the Allan MacDonald group and Hui Deng group on emerging exciton physics in TMD is published in Nature Review Materials! Congratulations!

September 2021: Hongyuan and Shaowei’s paper joint with the Crommie group on Imaging two-dimensional generalized Wigner crystal is published in Nature! Congratulations!

August 2021: Hongyuan and Shaowei’s paper joint with the Crommie group on imaging local discharge cascades for correlated electrons in moiré superlattices is published in Nature Physics! Congratulations!

June 2021: Wenyu and Sihan’s paper on Efficient Fizeau drag from Dirac electrons in monolayer graphene is published in Nature! Congratulations!

June 2021: Halleh’s paper with Allister at Stanford and our previous group member Jason is published in Nano Letters! Congratulations!  Thanks to WIRED magazine for highlighting our work!

March 2021: Wenyu and Hongyuan’s paper Nanoimaging of Low-Loss Plasmonic Waveguide Modes in a Graphene Nanoribbon is out in Nano Letters!

February 2021: Hongyuan and Shaowei’s paper joint with the Crommie group and Mit Naik in Louie group on STM study of 3D reconstructed moire superlattice is out in Nature Materials!

December 2020: Halleh’s paper on the rational design of semiconducting 2D polymers tailored for hybrid heterostructures is out in JACS!

December 2020: Iqbal’s paper with Kyunghoon Lee in the Zettl group on ultrahigh resolution microscopy of moire superlattices using microwave impedance microscopy is out in Science Advances! Congrats, Iqbal!

October 2020: Emma’s paper paper joint with Zhaodong Chu in Keji Lai’s group at UT Austin on nanoscale imaging of correlated electronic states in moire superlattices using optical spectroscopy and microwave impedance microscopy is out in PRL!

August 2020: Sihan, SeokJae, and Sheng’s paper on tunneling spectroscopy in carbon nanotube / hexagonal boron nitride / carbon nanotube heterojunctions is out in Nano Letters!

July 2020: Iqbal’s paper visualizing the flat electronic band in twisted bilayer graphene using ARPES with nanoscale resolution is out in Nature Physics!

June 2020: Lili, Sheng, and Sihan’s paper on soliton-dependent transport across bilayer graphene domain walls is out in Nano Letters!

March 2020: Sheng, Sihan, and former postdoc Zhiwen’s paper on Nonlinear Luttinger liquid plasmons in semiconducting SWCNTs is out in Nature Materials! Congrats to this collaborative team!

March 2020: Emma, Danqing, Chenhao, and Iqbal’s paper presenting the optical detection of strongly correlated phases in moiré superlattices is out in Nature! Congrats to this collaborative team!

March 16th 2020: COVID-19 Update– the Wang lab is transitioning to WFH to help stop the spread of COVID-19. Please reach out to us directly if you’re interested in learning more about our group, our research, or what it’s like to do research at Berkeley!

March 2020: Guorui’s paper observing a tunable correlated Chern insulator in a trilayer graphene hBN moiré superlattice is out in Nature! Congrats!

January 2020: Sihan’s paper on optical imaging and spectroscopy of atomically precise graphene nanoribbons is out in Nano Letters!  Congrats to a great collaboration with EMPA!

August 2019: Chenhao, Emma, and Danqing’s paper on spin, valley, and moire quasi-angular momentum of interlayer excitons in WSe2/WS2 heterostructures is out in Nature Physics! Congrats!

July 2019: Guorui’s paper observing tunable superconductivity in trilayer graphene Moire superlattices is out in Nature! Congrats to all the authors including current and past Wang-lab members Patrick Gallagher, Lili Jiang, and Zhiwen Shi!

April 2019: Patrick, Chanshan, and Tairu’s paper on using ThZ to measure signatures of quantum criticality near the charge neutrality point in graphene is out in Science! Congrats!

February 2019: Iqbal and Hans’s paper on engineering 2D heterojunctions through dielectric-dependent bandgap renormalization is out in Nature Electronics! Congrats!!

February 2019: Chenhao and Emma’s paper observing Moire superlattice exciton states is out in Nature! Congrats to this highly collaborative team including Wang-lab members Iqbal, Danqing, and Sihan; this is how science is done!

January 2019:  Huge congrats to Guorui Chen, who used Moire superlattices in trilayer systems to explore topological flat bands and the formation of a gate-tunable Mott Insulator! Check out his two new papers in Nature Physics and PRL!

July 2018: Chaw and Jason’s paper on the biexcitonic optical stark effect in MoSe2 is out in Nature Physics! Congrats!

July 2018: Sihan and Sheng’s paper, Correlation of Electron Tunneling and Plasmon Propagation in a Luttinger Liquid, came out in the Physical Review Letters! Congrats to a highly collaborative team!

May 2018: Chenhao and Jongwhan’s paper on imaging the spin-valley diffusion current in WS2/WSe2 heterostructures is out in Science. Highly collaborative cross-lab effort with Iqbal, Emma, Hans, and many more – Congrats everyone!

January 2018: Lili and Sheng’s paper Manipulation of domain-wall solitons in bi- and trilayer graphene is out in Nature Nanotechnology. Congrats!

July 2017: Jonghwan and Chenhao’s paper  Observation of ultralong valley lifetime in WSe2/MoS2 heterostructures is out in Science Advances. Congrats!

May 2017: Trinity and Jihun’s paper studying the coupling between 1D plasmon polariton in silver nanowires with the 2D phonon polariton of the SiC substrates is out in Nano Letters. Another great Wang group theory/experiment collaboration- congrats guys!

April 2017: Congrats to Steve, Jonghwan, and Xiaoping on their PRB paper, observing Raman selection-rule breakdown in monolayer MoS2 (Link)

Feb 2017: Jihun and Sheng’s paper on Goos-Hänchen Shift and Even–Odd Peak Oscillations in Edge-Reflections of Surface Polaritons in Atomically Thin Crystals is published in Nano Letters (Link)

December 2016: Jason and Halleh’s paper on imaging electric fields using graphene optoelectronics (for applications in neuroscience and chemical sensing) is out in Nature Communications (Link)

October 2016: Jonghwan and Chenhao make a clean sweep with papers published in Nature Physics and Advanced Materials. Great work guys!

October 2016: Feng is elected Fellow of the American Physical Society (APS). Congrats!

September 2016: Our work on the electronic structure of phosphorene is published in Nature Nanotechnology (Link)

July 2016: Sheng passed the qualifying examination. Congratulations!

May 2016: Our work on Soliton-dependent plasmon reflection at bilayer graphene domain walls has been published in Nature Materials (Link)

Sep 2015: Our work on characterization and manipulation of individual defects in insulating boron nitride has been published in Nature Nanotechnology (Link)

July 2015: Our work on Luttinger-liquid plasmons in single wall carbon nanotubes is published in Nature Photonics (Link) (Press)

June 2015: Our work optically probing electrolyte interfaces is published in Nature Communications (Link) (Press)

May 2015: Long and Jonghwan get their PhDs!! Congrats guys!

May 2015: Our work on designing “diatomic” high Q tunable dielectric gratings is published in Optics Express (Link)

April 2015: Our work on topological valley transport at bilayer graphene domain walls is published in Nature (Link) (Press)

December 2014: Our work on Optimizing Broadband Terahertz Modulation with Hybrid Graphene/Metasurface Structures is published in Nano Letters (Link)

December 2014: Our work on using circularly polarized light to manipulate valley degree of freedom in WSe2 is published in Science (Link)

October 2014: Our work on observing intrinsic bandage and Landau level renormalization in Graphene/BN heterostructure has been published in Nature Communications (Link)

October 2014: Our work on determining gate-dependent pseudo spin mixing term in Graphene/BN superlattices has been published in Nature Physics (Link)

August 2014: Our work on probing local strain at MX2-Metal boundaries with surface plasmon enhanced raman scattering has been published in Nano Letters (Link).

August 2014: Our work on ultrafast charge transfer between atomically thin MoS2/WS2 hetereolayers has been published in Nature Nanotechnology (Link).

June 2014: Our work on absorption cross-section determination of individual carbon nanotubes is published in PNAS (Link).

May 2014: Xiaoping gets the first Wang Lab PhD! Congrats Xiaoping, we’ll miss you!


Updated: June/2021