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DTSTART:20240215T140000Z
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TRANSP:OPAQUE
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LOCATION:Auditorium and Online (Teams)
SUMMARY:ICFO | SVEN BODENSTEDT
CLASS:PUBLIC
DESCRIPTION:This thesis describes theoretical background\, simulations\, ex
 perimental apparatus and measurements of nuclear spin dynamics via optical
 ly pumped magnetometers in unconventional magnetic field regimes. It is di
 vided into four parts: Magnetometry\, Nuclear Magnetic Resonance Spectrosc
 opy\, Nuclear Relaxation Dispersion\, and Nuclear Spin Control\, each look
 ing at different aspects of this topic.\nThe magnetometry section describe
 s how through integration of techniques from DC spin-exchange relaxation-f
 ree and rf magnetometers\, a widely tunable magnetometer is developed that
  offers a nearly flat response from DC up to few kHz with a sensitivity of
  less than 20 fT &radic\;Hz. Within this range\, it surpasses the capabili
 ties of inductive detection methods and eliminates the necessity for cryog
 enic temperatures that are required for superconducting quantum interferen
 ce devices (SQUIDs).\nThe subsequent part employs the magnetometer for con
 ducting nuclear magnetic resonance spectroscopy experiments involving coup
 led nuclear spin systems. A comprehensive analysis is undertaken to ascert
 ain the optimal magnetic field that yields the most precise determination 
 of the J-coupling constant. It is shown that for some systems the ultra-lo
 w field regime offers advantages compared to the zero- and high-field regi
 me.\nA key factor in choosing the optimal field is the nuclear spin relaxa
 tion&rsquo\;s strong field dependency\, explored in the thesis&rsquo\;s th
 ird part. This section thoroughly examines this subject in the unconventio
 nal ultra-low field range\, discussing long-lived coherences and the impac
 t of long correlations in molecular dynamics. The thesis experimentally in
 vestigates this by adapting the established fast-field cycling method to u
 ltra-low fields and combining it with optical detection.\nThe thesis&rsquo
 \; s final part focuses on enhancing nuclear spin dynamics manipulation th
 rough advanced methods that ensure selective\, efficient\, accurate\, and 
 fault-tolerant spin control. Ultra-low fields possess unique attributes\, 
 making even basic techniques like spin-selective resonant pulses challengi
 ng to implement. To address this\, novel concepts were devised\, enabling 
 effective spin control in the ultra-low field range\, rivaling or surpassi
 ng high-field counterparts. The efficiency of these improved pulse sequenc
 es is demonstrated in dynamical decoupling\, polarimetry\, and spectral fi
 ltering experiments.\n&nbsp\;\nThesis Director: Prof Dr. Morgan Mitchell a
 nd Dr. Michael Tayler 
DTSTAMP:20260407T053602Z
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