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DTSTART:20170326T030000
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DTSTAMP:20260429T024210Z
UID:58ac0c8e3a354779561869@ist.ac.at
DTSTART:20170228T110000
DTEND:20170228T123000
DESCRIPTION:Speaker: Martin Zemlicka\nhosted by Johannes Fink\nAbstract: Th
 e development of nanostructures patterned on highly disordered superconduc
 ting thin films attracts significant scientific attention nowadays. Such n
 anostructures exhibit unique properties with no analog in nature. Real mat
 erials are built from atoms and molecules\, which are quantum objects. An 
 artificial analog to them are two level systems\, so called quantum bits (
 qubits). Recent studies have revealed\, that disordered superconducting na
 nostructures provide strong nonlinearity\, which is necessary in order to 
 detect the separated qubit states. Suitable materials to form the basis of
  such structures are thin films with high sheet resistance (~1k?). \nThe p
 resentation deals with the deposition of the molybdenum carbide (MoC) supe
 rconducting thin films\, patterning of micro - and nanostructures and thei
 r experimental and theoretical analysis. Superconducting properties of thi
 n films were optimized by tuning the reactive magnetron sputtering process
 \, which allows for preparation of samples with thickness down to 1nm. Aft
 erwards\, they were analyzed by transport and tunneling methods\, which re
 vealed decreased quasiparticle lifetime. These results were confirmed by m
 icrowave and terahertz spectroscopy measurements and an extension of state
 d Mattis-Bardeen theory was developed in order to describe the results. Ap
 plicability was outlined on a nanobridge patterned on 10nm film with desir
 ed properties. Its transport measurements exhibited quantum phase-slip lik
 e behavior.
LOCATION:Seminar room Big Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:sdanzing@ist.ac.at
SUMMARY:Martin Zemlicka: Physical processes in disordered superconductors
URL:https://talks-calendar.ista.ac.at/events/332
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