BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Prof. Dr. Leyla Çolakerol Arslan  'Laser-driven engineering of va
 cancy and color-center defects in diamond'
DTSTART:20261014T120000Z
DTEND:20261014T140000Z
DTSTAMP:20261023T145400Z
UID:indico-event-18@indico.itu.edu.tr
DESCRIPTION:Laser-driven engineering of vacancy and color-center defects i
 n diamond\nLeyla Çolakerol Arslan\nDepartment of Physiscs\, Gebze Technic
 al University\nNitrogen-vacancy (NV) and silicon-vacancy (SiV) diamond col
 or centers offer a flexible foundation for quantum sensing\, photonics\, a
 nd developing quantum technologies. However\, it is still difficult to reg
 ulate the development and spatial engineering of these defects\, especiall
 y when targeted and scalable processing is required. Here\, using compleme
 ntary optical and positron annihilation lifetime spectroscopy (PALS) studi
 es\, we explore laser-driven defect engineering in diamond\, showing both 
 the modification of intrinsic vacancy-related defects and the laser-assist
 ed incorporation of an external impurity to form SiV centers. By creating 
 vacancies and encouraging their migration through transient heating proces
 ses\, nanosecond-pulsed 1064 nm irradiation of type IIa CVD diamond allows
  for localized sub-bandgap adjustment through nonlinear and defect-assiste
 d absorption.\nPhotoluminescence measurements show a decrease in NVH-relat
 ed emission and an increase in NV0 and NV-emission\, which is compatible w
 ith laser-induced redistribution of defect populations linked to hydrogen\
 , nitrogen\, and vacancies. PALS measurements also show that vacancy-type 
 defects undergo regular changes as laser exposure increases. These changes
  include positron lifetime shifts\, defect-related intensity variations\, 
 and the appearance of a long-lifetime component linked to greater open-vol
 ume regions. These data are consistent with vacancy migration\, NVHx disso
 ciation\, and hydrogen release and offer direct proof of laser-induced reo
 rganization and aggregation of vacancy-related defects. In a complementary
  approach\, a silicon-coated diamond surface was exposed to targeted laser
  irradiation\, which allowed for laser-assisted silicon integration into t
 he diamond lattice and the creation of SiV centers\, as seen by the distin
 ctive SiV photoluminescence about 738 nm. Together\, these results demonst
 rate that nanosecond laser irradiation can serve not only as a tool for mo
 difying the intrinsic defect landscape of diamond but also as a localized 
 route for introducing selected impurities and generating optically active 
 color centers. Together\, these findings show that nanosecond laser irradi
 ation can be used as a localized method of introducing certain impurities 
 and producing optically active color centers\, in addition to being a tool
  for altering the inherent defect landscape of diamond.\nShort Bio: \nPro
 f. Leyla C. Arslan’s current research focuses on laser-driven defect eng
 ineering in diamond\; voltage control of magnetism in multiferroic heteros
 tructures\; the growth and electrical\, structural\, and magnetic properti
 es of Heusler compounds\; and chemiresistive and mass-sensitive gas sensor
 s based on metal oxides.\nShe received her Ph.D. from Boston University an
 d subsequently spent several years conducting research at the National Syn
 chrotron Light Source (Brookhaven National Laboratory) and the Advanced Li
 ght Source (Lawrence Berkeley National Laboratory)\, where she employed a 
 range of synchrotron-based spectroscopy techniques to investigate structur
 al and electronic phenomena in nitrides and functional metal oxides. Follo
 wing her Ph.D.\, she carried out molecular beam epitaxy growth of nitride 
 semiconductors and investigated their surface structures using real-time x
 -ray studies. After joining the Department of Physics at Gebze Technical U
 niversity in 2010\, she established the Nanomagnetism and Spintronics Rese
 arch Laboratory\, which is equipped with a molecular beam epitaxy system i
 ntegrated with x-ray photoelectron spectroscopy\, as well as a low-tempera
 ture physical property measurement system and electron spin resonance faci
 lities.\n\nhttps://indico.itu.edu.tr/event/18/
LOCATION:Fizik Mühendisliği Bölümü Seminer Salonu (Fen-Edebiyat Fakü
 ltesi Binası)
URL:https://indico.itu.edu.tr/event/18/
END:VEVENT
END:VCALENDAR