Introduction:

I am currently a Humboldt postdoctoral fellow at the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg, Germany. My interests include the investigation of optical and quantum phenomena via nonlinear spectroscopic techniques, particularly in multiple spectral dimensions. Past work has focused on two-dimensional spectroscopy of colloidal nanocrystals at optical wavelengths to probe electronic and vibrational excitations, including their interactions. More recent work has focused on development of new multi-dimensional spectroscopic techniques in the infrared and terahertz frequency ranges, with the goal of studying both equilibrium and light-induced phases in quantum materials.

Education:

University of Michigan, Ann Arbor
2019 - Ph.D. Applied Physics
2016 - M.S.E. Electrical Engineering
2015 - B.S.E. Electrical Engineering
2015 - B.S. Interdisciplinary Physics

Publications (Google Scholar):

11. A. S. Disa, J. Curtis, M. Fechner, A. Liu, A. von Hoegen, M. Forst, T. F. Nova, P. Narang, A. Maljuk, A. V. Boris, B. Keimer, and A. Cavalleri. "Photo-Induced High-Temperature Ferromagnetism in YTiO3". Nature 617, 73-78 (2023). DOI: 10.1038/s41586-023-05853-8


10. A. Liu, D. B. Almeida, L. A. Padilha, and S. T. Cundiff. "Perspective: Multi-Dimensional Coherent Spectroscopy of Perovskite Nanocrystals". JPhys Materials 5, 2 (2022). DOI: 10.1088/2515-7639/ac4fa5
9. A. Liu. "Measuring Exciton Fine-Structure in Randomly Oriented Perovskite Nanocrystal Ensembles Using Nonlinear Optical Spectroscopy: Theory". Nanomaterials 12, 5 (2022). DOI: 10.3390/nano12050801
8. A. Liu, G. Nagamine, L. G. Bonato, D. B. Almeida, L. F. Zagonel, A. F. Nogueira, L. A. Padilha, and S. T. Cundiff. "Towards Engineering Intrinsic Linewidths and Line-Broadening in Perovskite Nanoplatelets". ACS Nano 15, 4 (2021). DOI: 10.1021/acsnano.0c09244


7. A. Liu, S. T. Cundiff, D. B. Almeida, and R. Ulbricht. "Spectral Broadening and Ultrafast Dynamics of a Nitrogen-Vacancy Center Ensemble in Diamond". Materials for Quantum Technologies 1, 2 (2021). DOI: 10.1088/2633-4356/abf330
6. A. Liu, D. B. Almeida, L. G. Bonato, G. Nagamine, L. F. Zagonel, A. F. Nogueira, L. A. Padilha, and S. T. Cundiff. "Multidimensional Coherent Spectroscopy Reveals Triplet State Coherences in Cesium Lead-Halide Perovsite Nanocrystals". Sci. Adv. 7, 1 (2021). DOI: 10.1126/sciadv.abb3594

News coverage: phys.org


5. A. Liu, S. T. Cundiff. "Spectroscopic Signatures of Electron-Phonon Coupling in Silicon-Vacancy Centers in Diamond". Phys. Rev. Mater. 4, 5 (2020). DOI: 10.1103/PhysRevMaterials.4.055202
4. A. Liu, L. G. Bonato, F. Sessa, D. B. Almeida, E. Isele, G. Nagamine, L. F. Zagonel, A. F. Nogueira, L. A. Padilha, and S. T. Cundiff. "Communication: Effect of Dimensionality on the Optical Absorption Properties of CsPbI3 Perovskite Nanocrystals". J. Chem. Phys. 151, (2019). DOI: 10.1063/1.5124399
3. A. Liu, D. B. Almeida, W. K. Bae, L. A. Padilha, and S. T. Cundiff. "Simultaneous Existence of Confined and Delocalized Vibrational Modes in Colloidal Quantum Dots". J. Phys. Chem. Lett. 10, 20 (2019). DOI: 10.1021/acs.jpclett.9b02474


2. A. Liu, D. B. Almeida, W. K. Bae, L. A. Padilha, and S. T. Cundiff. "Non-Markovian Exciton-Phonon Interactions in Core-Shell Colloidal Quantum Dots at Femtosecond Timescales". Phys. Rev. Lett. 123, 5 (2019). DOI: 10.1103/PhysRevLett.123.057403

News coverage: phys.org


1. C. Nelson, S. Deshpande, A. Liu, S. Jahangir, P. Bhattacharya, and D. G. Steel. "High Resolution Nonlinear Optical Spectroscopy of InGaN Quantum Dots in GaN Nanowires". JOSA B, 34, 6 (2017). DOI: 10.1364/JOSAB.34.001206