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DTSTART:20261101T010000
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DESCRIPTION:Atomic-Scale Magnetic Resonance Scattering: From Structure to Many-Body Dynamics\n\nSahand Tabatabaei\n\nLocation: QNC 1201\n\nAbstract\n\nIn 1972\, the work that would lead Peter Mansfield toward magnetic resonance imaging began with a different idea: using magnetic-field gradients to probe atomic-scale spatial periodicity with magnetic resonance\, in close analogy with diffraction. The idea offered a route to atomic-scale structural information while retaining the spectroscopic capabilities of magnetic resonance\, but the enormous field gradients required to reach interatomic distances placed it far beyond experimental reach.\n\nIn this talk\, I will describe how advances in nanoscale magnetic resonance\, quantum control\, and ultrasensitive spin detection allow us to revisit this idea more than fifty years later\, and use it to probe both structure and quantum many-body dynamics at atomic length scales. We use intense field gradients to perform magnetic resonance diffraction and interferometry on an ensemble of 31P spins in an InP nanocrystal. By encoding spin modulations with angstrom-scale wavelengths\, we detect sample displacements with picometer precision.\n\nI will then show how the same scattering-based approach provides direct access to many-body dynamics in an ensemble of ~40 million interacting nuclear spins. By preparing and measuring spatial Fourier modes of the longitudinal magnetization\, we probe dipolar spin transport from the hydrodynamic regime down to the lattice constant. At long wavelengths\, the dynamics are consistent with spin diffusion. At shorter wavelengths\, however\, the transport departs from diffusive scaling and exhibits a revival at the lattice periodicity. This diffraction echo directly reveals the underlying lattice in the transport response.\n\nThese results bring magnetic resonance scattering to the fundamental structural length scale of condensed
X-ALT-DESC;FMTTYPE=text/html:Atomic-Scale Magnetic Resonance Scattering: From Structure to Many-Body Dynamics<br />Sahand Tabatabaei<br><br>Location: QNC 1201<br><br>Abstract<br />In 1972, the work that would lead Peter Mansfield toward magnetic resonance imaging began with a different idea: using magnetic-field gradients to probe atomic-scale spatial periodicity with magnetic resonance, in close analogy with diffraction. The idea offered a route to atomic-scale structural information while retaining the spectroscopic capabilities of magnetic resonance, but the enormous field gradients required to reach interatomic distances placed it far beyond experimental reach.<br><br>In this talk, I will describe how advances in nanoscale magnetic resonance, quantum control, and ultrasensitive spin detection allow us to revisit this idea more than fifty years later, and use it to probe both structure and quantum many-body dynamics at atomic length scales. We use intense field gradients to perform magnetic resonance diffraction and interferometry on an ensemble of 31P spins in an InP nanocrystal. By encoding spin modulations with angstrom-scale wavelengths, we detect sample displacements with picometer precision.<br><br>I will then show how the same scattering-based approach provides direct access to many-body dynamics in an ensemble of ~40 million interacting nuclear spins. By preparing and measuring spatial Fourier modes of the longitudinal magnetization, we probe dipolar spin transport from the hydrodynamic regime down to the lattice constant. At long wavelengths, the dynamics are consistent with spin diffusion. At shorter wavelengths, however, the transport departs from diffusive scaling and exhibits a revival at the lattice periodicity. This diffraction echo directly reveals the underlying lattice in the transport response.<br><br>These results bring magnetic resonance scattering to the fundamental structural length scale of condensed
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SUMMARY:IQC PhD seminar featuring Sahand Tabatabaei
DTSTART;TZID=America/New_York:20260922T140000
DTEND;TZID=America/New_York:20260922T150000
DTSTAMP:20260916T194816Z
TRANSP:OPAQUE
STATUS:CONFIRMED
SEQUENCE:0
LOCATION:QNC 1201
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