Fedor Jelezko

Low temperature studies of the excited-state structure of negatively charged nitrogen-vacancy color centers in diamond.

We report a study of the 3E excited-state structure of single negatively charged nitrogen-vacancy (NV) defects in diamond, combining resonant excitation at cryogenic temperatures and optically detected magnetic resonance. A theoretical model is developed and shows excellent agreement with experimental observations. In addition, we show that the two orbital branches associated with the 3E excited state are averaged when operating at room temperature. This study leads to an improved physical understanding of the NV defect electronic structure, which is invaluable for the development of diamond-based quantum information processing.

Highly efficient FRET from a single nitrogen-vacancy center in nanodiamonds to a single organic molecule.

We show highly efficient fluorescence resonance energy transfer (FRET) between negatively charged nitrogen-vacancy (NV) centers in diamond as donor and dye molecules as acceptor, respectively. The energy transfer efficiency is 86% with particles of 20 nm in size. Calculated and experimentally measured energy transfer efficiencies are in excellent agreement. Owing to the small size of the nanocrystals and careful surface preparation, energy transfer between a single nitrogen-vacancy center and a single quencher was identified by the stepwise change of energy transfer efficiencies due to bleaching of single acceptor molecules. Our studies pave the way toward FRET-based scanning probe techniques using single NV donors.

Optically controlled switching of the charge state of a single nitrogen-vacancy center in diamond at cryogenic temperatures.

P. Siyushev, ∗ H.Pinto, A.Gali, 3 F. Jelezko, and J. Wrachtrup 5 3.Physikalisches Institut and Stuttgart Research Center of Photonic Engineering (SCoPE), Universität Stuttgart, Pfaffenwaldring 57, Stuttgart, D-70569, Germany Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, Budapest, POB 49, H-1525, Hungary Department of Atomic Physics, Budapest University of Technology and Economics, Budafoki ut 8, H-1111, Budapest, Hungary Institut für Quantenoptik, Universität Ulm, D-89081 Ulm, Germany Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany

Basic Concepts of Electron Paramagnetic Resonance

The electron paramagnetic resonance is observable in substances that contain electronic magnetic dipoles.

Fundamentals of EPR Related Methods

We present a brief historical introduction to the field of pulse magnetic resonance (see, e.g., [1]). The first EPR phenomenon was observed by Zavoisky in 1944 [2]. In 1946 Bloch [3] and Purcell et al. [4] reported the first nuclear magnetic resonance (NMR) experiments.

Perspectives of Applications of Magnetic Properties of Semiconductor Nanostructures and Single Defects

The growing interest in manipulation and read-out of single-electron and nuclear spin states in semiconductors and semiconductor nanostructures is associated with possible applications in spintronics and solid state quantum information processing.

State-of-Art: High-Frequency EPR, ESE, ENDOR and ODMR in Wide-Band-Gap Semiconductors

Silver halides have unique features in solid state physics because their properties are considered to be of borderline nature between ionic and covalent bonding.

Retrospectives: Magnetic Resonance Studies of Intrinsic Defects in Semiconductors

Point defects of intrinsic nature in semiconductors influence the electronic and optical properties of the main technologically important semiconductors such as diamond, silicon, silicon carbide and the 3–5 compounds. The most simple defects are vacancies and interstitials in elemental semiconductors as well as antisite defects in the compound materials.

Magnetic Resonance in Semiconductor Micro- and Nanostructures

Nowadays semiconductor and solid-state physics appears to be the physics of systems with reduced dimensionality. Fabrication of single or periodic potential wells by simply combining two materials with different energy gaps and spatial dimensions confining the motion of electrons and holes results in exciting new effects that originate in the size dependence of quantum phenomena.

Quantum control of electron and nuclear spin qubits in the solid‐state

We review our recent work towards extending quantum control techniques developed in AMO physics to manipulate quantum systems in the solid‐state. These systems feature a number of unique opportunities and difficult challenges. Specifically we describe our efforts toward understanding and controlling the complex environment of solid‐state quantum bits, coupling them over macroscopic distances as well as ideas for scaling to multi‐qubit systems.