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Feng Guo will be presenting his work at NIST this Monday Aug. 4 at 10:30 am in 220 Clark.
Spin waves at work: Imaging and Characterization of Magnetic Nanostructures
Abstract:
Many of the applications for magnetic nanotechnology depend on the ability to characterize the magnetic properties on the nanoscale. At NIST, we have been developing a ferromagnetic resonance force microscopy (FMRFM) facilitywith the goal of developing diagnostic measurements for practical devices. Conceptually, FMRFM may be regarded as a microwave spectrometer with a scanned probe detector, and it has the ability to “see” the ferromagnetic resonance spectra of buried structures. In the first example, I will describe the defect detection in an array by using spin wave resonance as a contrast mechanism. In another set of measurements, we investigate confined spin wave modes in patterned structures, and we demonstrate the ability to characterize the film edge properties. Throughout the talk I will attempt to emphasize the simple physics of the spin waves and its application to technological problems will be discussed in the context of developing scalable quantum information processing on a chip.

Our paper “A single-molecule approach to ZnO defect studies: Single photons and single defects” by N. R. Jungwirth, Y. Y. Pai, H. S. Chang, E. R. MacQuarrie, K. X. Nguyen, and G. D. Fuchs has just been released at Journal of Applied Physics.

Our paper “A single-molecule approach to ZnO defect studies: Single photons and single defects” by N. R. Jungwirth, Y. Y. Pai, H. S. Chang, E. R. MacQuarrie, K. X. Nguyen, and G. D. Fuchs has just been released at Journal of Applied Physics.

We’re excited to present one talk and one poster on our research at the upcoming PASPS VIII meeting in Washington, D.C.  The talk will be “Driving diamond nitrogen-vacancy center spins with mechanical motion”  presented by Professor Fuchs. The poster will be “Single Photon Emission from Defects in Sputtered ZnO Films” by N. R. Jungwirth,  H. S. Chang, Y. Y. Pai, and G. D. Fuchs presented by Hung. Come see them!

Isaiah Gray, and incoming Applied Physics graduate student has joined our group.  Welcome Isaiah!

The Cornell Chronicle covers Greg’s DOE early career award.

We are being joined this summer by two new undergraduate students.  Caleb Zerger is joining us for the summer from the University of Michigan through the CCMR REU program, and Jonathan Karsch, a Cornell engineering student, is joining us though an Engineering Learning Initiatives research award.  Welcome Caleb and Jonathan!

Greg Fuchs has been awarded a highly selective early career award from the US department of energy office of basic energy sciences.

Evan MacQuarrie has been awarded William Nichols Findley Award (awarded annually to a Engineering Physics or Physics student for an exceptional research paper) for the paper “Mechanical spin control of nitrogen-vacancy centers in diamond”. Congratulations Evan!

Jiuen Lee, Ph.D. from the University of Michigan will be giving a seminar titled “Temporal and Spatial Control of Quantum Dots for On-Chip Integration” on Friday May 9 at 2 pm in Physical Sciences 120.
Abstract
Quantum dots (QDs) are nanostructures that confine electrons in three spatial dimensions. Due to their discrete atom-like energy levels, a wide variety of applications related to the optical properties of dots are possible. One such application is to integrate a QD in a photonic crystal cavity to enable the enhanced interaction between electrons and photons. Such hybrid systems of QD electrons and cavity photons can be an interesting platform for both the fundamental study of light-matter interactions and applications in information processing. In the first part of this talk, we focus on the temporal dynamics of single QDs coupled to a photonic cavity. In particular, an optical experiment using two time-delayed ultrafast pulses enables the quantitative description of the emission enhancement and reveals the nonlinearity of various transitions in single QDs. In the second part, we discuss a tool that can deterministically couple a dot to a cavity. Since the dot-cavity coupling efficiency depends on their spatial overlap, the ability to control QD positions at the fabrication level is highly desirable. We use a focused-ion-beam to pattern QDs at predetermined locations and evaluate their fidelity and optical properties for practical applications. All these experiments will be discussed in the context of developing scalable quantum information processing on a chip.