Department Spins in Energy Conversion and Quantum Information Science
Working Groups
Quantum Information with Solid State Spins - QuISS
Group Leader: B. Naydenov
The research group "Quantum Information with Solid State Spins" (AG QuISS) is dedicated to the investigation of quantum materials that are crucial for the development of a quantum computer. The working group focuses on spin-based qubits. Such systems offer the possibility to design their quantum mechanical states with .atomic precision, so that the concepts of entanglement, coherent control and quantum measurement can be freely explored and used.
As a prominent example, the nuclear spin in a two-dimensional layer (for example in fluorographene, see figure) have long coherence times and a very large Hilbert space and could be the building block of a solid state quantum simulator. Their use as protected quantum registers, which can also be quickly manipulated and read out by means of magnetic resonance (NMR, EPR), has been demonstrated. For the readout process, AG QuISS concentrates on spin color centres (NV centre in diamond), which offer scalability and integration capability. With this unique physical system, quantum states at interfaces between diamond and nuclear spin-bearing molecules are investigated. Within the EPRoC project, the AG QuISS is in the process of putting an NV-based AFM into operation, which will allow magneto spectrometry with nanoscale resolution and high sensitivity.
From left to right: Lucas Tsunaki, Rozhan Mohammadibidmeshki, Maren Herrendörfer, Yannick Weise, Boris Naydenov, Michael Dotan and Erik Sieber.
Spins in Energy Materials - SPEM
Group Leader: P. Groszewicz
The working group Spins in Energy Materials (AG SPEM) focuses on the identification and quantification of paramagnetic states in energy materials. The EPR activities take place in two Joint Labs, the Berlin Joint EPR Laboratory (BeJEL) between HZB and FU Berlin (including transient EPR, in cooperation with JunProf J. Behrends) and the Joint Lab EPR4Energy between MPI-CEC and HZB in cooperation with Dr. Alexander Schnegg (including frequency-domain THz-EPR).
The JointLabs (location Adlershof) are equipped with five unique EPR spectrometers, covering a frequency range from 9 GHz to more than 20 THz and magnetic fields up to 12 T. In addition, a 400MHz NMR laboratory was established in March 2020. THz-EPR at BESSY II and NMR are operated as user facilities at HZB.
The EPR activities take place in two Joint Labs, the Berlin Joint EPR Laboratory (BeJEL) between HZB and FU Berlin (including transient EPR, in cooperation with JunProf J. Behrends) and the Joint Lab EPR4Energy between MPI-CECand HZB in cooperation with Dr. Alexander Schnegg (including frequency-domain THz-EPR).
One focus of the research of the SPEM group is the development and application of new operando/in situ EPR methods, such as in-situ (photo)catalysis (cooperation MPI-CEC) or EPR-on-a-Chip (EPRoC), which is developed together with the University of Stuttgart. Besides the investigation of structural and electrical defects in solar cell materials, the aim is to study structure-function relationships at catalytically active interfaces as well as in electrochemical processes as occur in battery materials. The EPRoC and NMR activities have been funded by the BMBF since May 2019 with 6.6 M€ through a network coordinated by the head of ASPIN, with the long-term goal of commercialization. The research of the SPEM group focuses on the development and application of operando/in situ EPR methods for (photo)catalytic, electrochemical and solar cell applications as well as on the investigation of charge transfer processes at heterointerfaces using electrically detected magnetic resonance (EDMR) and conductive AFM (cAFM), the latter in close cooperation with the University of Utah (USA).