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Freie Uni­versität Ber­lin - Fachbereich Physik - Insti­tut für Exper­i­ment­al­physik

Research assist­ant (Prae­doc) (m/f/d)


with 3/4 part-time job
lim­ited to 31.12.2025
Ent­gelt­gruppe 13 TV-L FU
Ref­er­ence code: TRR227_B5_UP1_E

Working field:

The goal of this pro­ject is to resolve spin dynam­ics at nano­meter length and pico­second time scales. Usu­ally, the method of choice for invest­ig­at­ing single atoms on sur­faces is low- tem­per­at­ure scan­ning tun­nel­ing micro­scopy/spec­tro­scopy (STM/STS). However, this tech­nique is very slow with its fun­da­mental time res­ol­u­tion being lim­ited by the stray capa­cit­ances. In con­trast, ultra­fast time res­ol­u­tion can be achieved by femto­second laser spec­tro­scopy. We have recently suc­ceeded in coup­ling THz pulses into the junc­tion of a low-tem­per­at­ure STM and achieved pico-second time res­ol­u­tion in the tun­nel junc­tion. More gen­er­ally, our group has a strong focus on single-atom mag­net­ism at sur­faces. Using tun­nel­ing spec­tro­scopy, we resolve spin excit­a­tions and exchange inter­ac­tions with a sub­strate, such as the Kondo effect on metals or Yu-Shiba-Rusinov states on super­con­duct­ors. With the new THz-STM tech­nique we aim at gain­ing a fun­da­mental under­stand­ing of the dynam­ics of these mag­netic sys­tems.

Job descrip­tion:
You will be using and fur­ther improv­ing the THz-STM for resolv­ing spin dynam­ics of single atoms and nano­struc­tures on sur­faces. You will be invest­ig­at­ing the spin relax­a­tion chan­nels of mag­netic adatom struc­tures on trans­ition metal dichal­co­gen­ides. You will resolve the influ­ence of the atomic-scale envir­on­ment and the role of spin-orbit coup­ling. Finally, you will design mag­netic nano­struc­tures which allow to tailor the inter­ac­tions with the envir­on­ment.
You will be given the oppor­tun­ity to work on state-of-the-art exper­i­ments and con­trib­ute to their fur­ther improve­ment. You will have the oppor­tun­ity to do research towards a PhD degree. You are expec­ted to be an act­ive mem­ber of the research group Franke and of the col­lab­or­at­ive research cen­ter “Ultra­fast Spin Dynam­ics” and par­ti­cip­ate in its Gradu­ate School.


Mas­ter of Sci­ence in Phys­ics

Mas­ter of Sci­ence in Phys­ics with focus on ultra-fast optics or sur­face phys­ics. You are a highly motiv­ated stu­dent and curi­ous to carry out high-level exper­i­ments. You like to work in a team, but can also work inde­pend­ently. You have a strong interest and back­ground in solid state phys­ics. You have exper­i­ence in (sev­eral of) the fol­low­ing areas: scan­ning tun­nel­ling micro­scopy/spec­tro­scopy, ultra-fast optics, sur­face phys­ics, ultra-high vacuum tech­niques, low tem­per­at­ure equip­ment, and pro­gram­ming.

How to apply:

Applic­a­tions should be sent by e-mail, together with sig­ni­fic­ant doc­u­ments, indic­at­ing the ref­er­ence code, in PDF format (prefer­ably as one doc­u­ment) no later than June 6th, 2022 to Ms. Prof. Dr. Kath­ar­ina Franke: or postal to

Freie Uni­versität Ber­lin
Fachbereich Physik
Insti­tut für Exper­i­ment­al­physik
Ms. Prof. Dr. Kath­ar­ina Franke
Arn­im­al­lee 14
14195 Ber­lin (Dah­lem)

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