Abstract
We report on the epitaxial growth and the characterization of thin FePt films and the subsequent patterning of magnetic lattice structures. These structures can be used to trap ultracold atoms for quantum simulation experiments. We use Molecular Beam Epitaxy (MBE) to deposit monocrystalline FePt films with a thickness of 50 nm. The films are characterized with X-ray scattering and Mossbauer spectroscopy to determine the long range order parameter and the hard magnetic axes. A high monocrystalline fraction was measured as well as a strong remanent magnetization of M = 900 kA/m and coercivity of 0.4 T. Using Electron Beam Lithography (EBL) and argon ion milling we create lattice patterns with a period down to 200 nm, and a resolution of 30 nm. The resulting lattices are imaged in a Scanning Electron Microscope in cross-section created by a Focused Ion Beam. A lattice with continuously varying lattice constant ranging from 5 micrometer down to 250nm has been created to show the wide range of length scales that can now be created with this technique.
Highlights
Lattices of trapped, cold atoms play a central role in the development of quantum simulators and quantum information protocols
We report on the epitaxial growth and the characterization of thin FePt films and the subsequent patterning of magnetic lattice structures
The films are characterized with X-ray scattering and M€ossbauer spectroscopy to determine the long range order parameter and the hard magnetic axes
Summary
Cold atoms play a central role in the development of quantum simulators and quantum information protocols. Implementations on the scale of several micrometers typically employ long-range interactions of Rydberg atoms,[1,2] while those on the submicrometer scale are described by Hubbard models, governed by tunneling and on-site interaction.[3] Based on the trapped neutral atoms, quantum simulators of spin models in many lattices and low dimensional systems have been successfully realized.[4]. There is a strong interest to scale down these atomic trapping lattices, in particular, for experiments simulating Hubbard and related models.[5,6]. With smaller inter-trap spacing or lattice constants, higher tunneling rates and stronger interactions over multiple sites may be achieved, which will allow the study of more complicated models such as the extended Hubbard model and long range spin models.[7,8] There is a strong interest to scale down these atomic trapping lattices, in particular, for experiments simulating Hubbard and related models.[5,6] With smaller inter-trap spacing or lattice constants, higher tunneling rates and stronger interactions over multiple sites may be achieved, which will allow the study of more complicated models such as the extended Hubbard model and long range spin models.[7,8]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
