Sean E. Barrett
| Sean E. Barrett | |
|---|---|
| Born | |
| 🎓 Alma mater | University of Illinois at Urbana–Champaign (Ph.D., 1992) |
| 💼 Occupation | |
| Known for |
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| 🌐 Website | opnmr |
Sean Eric Barrett is an American experimental condensed matter physicist and Professor of Physics and Applied Physics at Yale University. He is known for his work using nuclear magnetic resonance (NMR) techniques to study quantum Hall effect physics, including some of the first experimental evidence for skyrmions in quantum wells, as well as contributions to solid-state magnetic resonance imaging (MRI), discrete time crystals, and sparse-sampling reconstruction algorithms.
Education and career
Barrett earned his Ph.D. in physics from the University of Illinois at Urbana–Champaign in 1992, where he studied under Charles P. Slichter.[1] He then held a postdoctoral position at AT&T Bell Laboratories.[1] He joined the Yale faculty in 1994 and holds a joint appointment in the Department of Applied Physics.[2] He is a member of the Yale Quantum Institute[3] and the Yale Program in Physics, Engineering, and Biology.[4]
Barrett has served as Director of Undergraduate Studies and Dean of Graduate Studies in the Yale Physics Department.[1]
Research
Quantum Hall skyrmions and OPNMR
Barrett developed and applied the technique of optically pumped nuclear magnetic resonance (OPNMR) to study two-dimensional electron systems in GaAs quantum wells in the quantum Hall effect regime. In a 1995 paper, Barrett and collaborators at Bell Labs provided experimental evidence for the existence of finite-size skyrmions as the charged excitations of the quantum Hall ferromagnetic ground state, by measuring the rapid drop in electron spin polarization on either side of filling factor .[5]
Subsequent OPNMR work by Barrett's group at Yale provided spectroscopic evidence for skyrmion localization near at low temperatures,[6] and placed new experimental constraints on the composite fermion description of the state.[7]
Spin echoes in dipolar solids
Barrett's group discovered spin echoes generated by strong π pulses in dipolar solids such as silicon, which revealed intrinsic coherence effects arising from the internal structure of hard pulses.[8][9]
MRI of solids
Building on the quadratic echo technique, Barrett and collaborators demonstrated three-dimensional phosphorus-31 MRI of hard and soft solids, including ex vivo bone and soft tissue samples, published in the Proceedings of the National Academy of Sciences in 2012.[10]
Discrete time crystals
In 2018, Barrett's group observed signatures of a discrete time crystal (DTC) using NMR in an ordered crystal of monoammonium phosphate (MAP), reported in Physical Review Letters and Physical Review B.[11][12] This was the second known observation of a DTC signature in a solid, and the finding was in an ordered spatial crystal, challenging the prevailing assumption that disorder (via many-body localization) was a necessary condition for DTC formation. The group also demonstrated a novel "DTC echo" that revealed hidden coherence in the driven system. The results were highlighted by the American Physical Society and covered in Yale News and other media.[13][14]
Sparse-sampling and spectral reconstruction
Barrett's group has developed algorithms for accelerating multidimensional NMR and MRI experiments using iterated maps and sparse-sampling techniques, enabling faster data acquisition without loss of spectral fidelity.[15]
Selected publications
- Barrett, S. E.; Dabbagh, G.; Pfeiffer, L. N.; West, K. W.; Tycko, R. (1995). "Optically Pumped NMR Evidence for Finite-Size Skyrmions in GaAs Quantum Wells near Landau Level Filling ν = 1". Physical Review Letters. 74 (25): 5112–5115. doi:10.1103/PhysRevLett.74.5112.
- Khandelwal, P.; et al. (2001). "Spectroscopic Evidence for the Localization of Skyrmions near ν = 1 as T → 0". Physical Review Letters. 86 (23): 5353–5356. arXiv:cond-mat/0009134. doi:10.1103/PhysRevLett.86.5353.
- Dong, Y.; et al. (2008). "Controlling Coherence Using the Internal Structure of Hard Pi Pulses". Physical Review Letters. 100 (24). arXiv:0804.3087. doi:10.1103/PhysRevLett.100.247601. Unknown parameter
|article-number=ignored (help) - Frey, M. A.; et al. (2012). "Phosphorus-31 MRI of Hard and Soft Solids Using Quadratic Echo Line-Narrowing". Proceedings of the National Academy of Sciences. 109 (14): 5190–5195. doi:10.1073/pnas.1117293109.
- Rovny, J.; Blum, R. L.; Barrett, S. E. (2018). "Observation of Discrete-Time-Crystal Signatures in an Ordered Dipolar Many-Body System". Physical Review Letters. 120 (18). arXiv:1802.00126. doi:10.1103/PhysRevLett.120.180603. Unknown parameter
|article-number=ignored (help)
References
- ↑ 1.0 1.1 1.2 "People". Barrett Lab Website. Yale University. Retrieved 2026-02-22.
- ↑ "Sean Barrett". Department of Physics. Yale University. Retrieved 2026-02-22.
- ↑ "Sean Barrett". Yale Quantum Institute. Yale University. Retrieved 2026-02-22.
- ↑ "Sean Barrett". Program in Physics, Engineering, and Biology. Yale University. Retrieved 2026-02-22.
- ↑ Barrett, S. E.; Dabbagh, G.; Pfeiffer, L. N.; West, K. W.; Tycko, R. (1995). "Optically Pumped NMR Evidence for Finite-Size Skyrmions in GaAs Quantum Wells near Landau Level Filling ν = 1". Physical Review Letters. 74 (25): 5112–5115. Bibcode:1995PhRvL..74.5112B. doi:10.1103/PhysRevLett.74.5112. PMID 10058686.
- ↑ Khandelwal, P.; Dementyev, A. E.; Kuzma, N. N.; Barrett, S. E.; Pfeiffer, L. N.; West, K. W. (2001). "Spectroscopic Evidence for the Localization of Skyrmions near ν = 1 as T → 0". Physical Review Letters. 86 (23): 5353–5356. arXiv:cond-mat/0009134. Bibcode:2001PhRvL..86.5353K. doi:10.1103/PhysRevLett.86.5353. PMID 11384494.
- ↑ Dementyev, A. E.; Kuzma, N. N.; Khandelwal, P.; Barrett, S. E.; Pfeiffer, L. N.; West, K. W. (1999). "Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description of ν = 1/2". Physical Review Letters. 83 (24): 5074–5077. arXiv:cond-mat/9907280. Bibcode:1999PhRvL..83.5074D. doi:10.1103/PhysRevLett.83.5074.
- ↑ Dementyev, A. E.; Li, D.; MacLean, K.; Barrett, S. E. (2003). "Anomalies in the NMR of Silicon: Unexpected Spin Echoes in a Dilute Dipolar Solid". Physical Review B. 68 (15). arXiv:cond-mat/0308584. Bibcode:2003PhRvB..68o3302D. doi:10.1103/PhysRevB.68.153302. Unknown parameter
|article-number=ignored (help) - ↑ Dong, Y.; Ramos, R. G.; Li, D.; Barrett, S. E. (2008). "Controlling Coherence Using the Internal Structure of Hard Pi Pulses". Physical Review Letters. 100 (24). arXiv:0804.3087. Bibcode:2008PhRvL.100x7601D. doi:10.1103/PhysRevLett.100.247601. PMID 18643618. Unknown parameter
|article-number=ignored (help) - ↑ Frey, M. A.; Michaud, M.; VanHouten, J. N.; Insogna, K. L.; Madri, J. A.; Barrett, S. E. (2012). "Phosphorus-31 MRI of Hard and Soft Solids Using Quadratic Echo Line-Narrowing". Proceedings of the National Academy of Sciences. 109 (14): 5190–5195. Bibcode:2012PNAS..109.5190F. doi:10.1073/pnas.1117293109. PMC 3325706. PMID 22431609.
- ↑ Rovny, J.; Blum, R. L.; Barrett, S. E. (2018). "Observation of Discrete-Time-Crystal Signatures in an Ordered Dipolar Many-Body System". Physical Review Letters. 120 (18). arXiv:1802.00126. Bibcode:2018PhRvL.120r0603R. doi:10.1103/PhysRevLett.120.180603. PMID 29775353. Unknown parameter
|article-number=ignored (help) - ↑ Rovny, J.; Blum, R. L.; Barrett, S. E. (2018). "31P NMR study of discrete time-crystalline signatures in an ordered crystal of ammonium dihydrogen phosphate". Physical Review B. 97 (18). arXiv:1802.00457. Bibcode:2018PhRvB..97r4301R. doi:10.1103/PhysRevB.97.184301. Unknown parameter
|article-number=ignored (help) - ↑ "Yale physicists find signs of a time crystal". Yale News. 2018-05-02. Retrieved 2026-02-22.
- ↑ Schirber, Michael (2018-05-01). "Synopsis: Time Crystals Multiply". Physics. American Physical Society. Retrieved 2026-02-22.
- ↑ Frey, M. A.; Sethna, Z.; Manley, G. A.; Sengupta, S.; Zilm, K. W.; Loria, J. P.; Barrett, S. E. (2013). "Accelerating Multidimensional NMR and MRI Experiments Using Iterated Maps". Journal of Magnetic Resonance. 237: 100–109. Bibcode:2013JMagR.237..100F. doi:10.1016/j.jmr.2013.09.015. PMC 3917325. PMID 24140624.
External links
- Barrett Lab Website at Yale University
- Faculty profile at Yale Department of Physics
- Faculty profile at Yale School of Engineering & Applied Science
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