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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-8451
DTSTART:20231026T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T065124Z
LAST-MODIFIED:20231006T200711Z
LOCATION:5310 Chamberlin
SUMMARY:First-Principles Many-Body Theory and Quantum Dynamics for Sol
 id-State Materials\, R. G. Herb Condensed Matter Seminar\, Yuan Ping\,
  UW-Madison
DESCRIPTION:Stable\, scalable\, and reliable quantum information scien
 ce (QIS) is poised to revolutionize human well-being through quantum c
 omputation\, communication and sensing. In this talk\, I will show our
  recent development on first-principles computational platforms to stu
 dy quantum coherence and optical readout as critical processes in QIS 
 and spintronics in solid-state materials\, by combining first-principl
 es many-body theory and open quantum dynamics. <br>\n<br>\nFirst\, we 
 will show how we reliably predict energetics\, electronic and optical 
 properties of spin defects and their host two-dimensional materials fr
 om first-principles many-body theory\, which accurately describes high
 ly anisotropic dielectric screening and strong many-body interactions.
  In particular\, we will show how we predict spin-dependent optical co
 ntrast for information readout of spin qubits by computing exciton rad
 iative and phonon-assisted nonradiative as well as spin-orbit induced 
 intersystem crossing rates from first-principles. <br>\n<br>\nNext\, w
 e will introduce our recently developed real-time density-matrix dynam
 ics approach with first-principles electron-electron\, electron-phonon
 \, electron-impurity scatterings and self-consistent spin-orbit coupli
 ng\, which can accurately predict spin and carrier lifetime and pump-p
 robe Kerr-rotation signatures for general solids. As an example\, we w
 ill show our theoretical prediction on Dirac materials under electric 
 field to realize spin-valley locking with extremely long spin lifetime
  and spin diffusion length\, and distinct dependence on electron-phono
 n couplings in spin and carrier relaxation in halide perovskites. This
  theoretical and computational development is critical for designing n
 ew materials promising in quantum-information science and spintronics 
 applications. 
URL:https://www.physics.wisc.edu/events/?id=8451
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