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VERSION:2.0
PRODID:icalendar-ruby
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260415T043206Z
UID:https://www.mpsd.mpg.de/events/18880/2724
DTSTART:20190604T133000Z
DTEND:20190604T143000Z
CLASS:PUBLIC
CREATED:20190528T101851Z
DESCRIPTION: Magnetic fields are challenging to localise to short length sc
 ales because their sources are electrical currents. Conversely\, electric 
 fields can be applied using electrostatic gates on scales limited only by 
 lithography. This has important consequences for the design of spin-based 
 information technologies: while the Zeeman interaction with a magnetic fie
 ld provides a convenient tool for manipulating spins\, it is difficult to 
 achieve local control of individual spins on the length scale anticipated 
 for useful quantum technologies. This motivates the study of electric fiel
 d control of spin Hamiltonians [1]. Mn2+ defects in ZnO exhibit extremely 
 long spin coherence times and a small axial zero-field splitting. Their en
 vironment is inversion-symmetry-broken\, and the zero-field splitting show
 s a linear dependence on an externally-applied electric field. This contro
 l over the spin Hamiltonian offers a route to controlling the phase of sup
 erpositions of spin states using d.c. electric field pulses\, and to drivi
 ng spin transitions using microwave electric fields [2]. Experiments on Mn
  defects in ZnO provide insights into how to achieve manipulation of indiv
 idual spins on surfaces using a scanning tunnelling microscope. A high-fre
 quency voltage applied to the tip can drive electron spin resonance in Fe 
 atoms on MgO surfaces via modulation of the crystal field experienced by t
 he Fe atom [3]. It has been proposed theoretically that frustrated exchang
 e-coupled molecular clusters might offer sensitivity to externally-applied
  electric fields [4]. Experiments on an antiferromagnetically-coupled Cu3 
 compound reveal a small linear electric field effect. A comparable sensiti
 vity is exhibited by the heterometallic S = 1 antiferromagnetic ring Cr7Mn
 \, but no effect is found for the S = 1/2 Cr7Ni [5].\nVortragende(r): Arzh
 ang Ardavan
LAST-MODIFIED:20190528T101851Z
LOCATION:CFEL (Bldg. 99)\, Raum: Seminar Room III\, EG.080
ORGANIZER;CN=Andrea Cavalleri:mailto:
SUMMARY:MPSD Seminar:  Electrical control of quantum spins 
URL;VALUE=URI:https://www.mpsd.mpg.de/events/18880/2724
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