Session TOC. There are 6 abstracts in this session.

Session: Exotica, Instrumentation, time: 10:45-11:10
Solid State NMR Probes for 1.5 GHz Spectrometer
Peter L. Gor'kov; Jason Kitchen; Joana Paulino; Xiaoling Wang; Ilya Litvak; Ivan Hung; Zhehong Gan; William W. Brey
National High Magnetic Field Laboratory, Tallahassee, FL
We discuss solid-state NMR probes designs for the 1.5 GHz NMR magnet, which completed its first year of operation. Three NMR probes were made for the 1.5 GHz Bruker NEO spectrometer – a 2.0-mm triple-resonance 1H/X/Y MAS probe for materials and biosolids, a 1H/X static probe for materials and aligned samples, and a 3.2-mm MAS probe for low-γ and quadrupolar nuclei. We will report NMR spectra and probe performance, discuss RF circuits and other design features specific to operating in a hybrid magnet environment. This new 1.5 GHz NMR facility is now open to external users, offering enhancements in sensitivity and resolution, and new opportunities in NMR of half-integer quadrupolar and low-γ nuclei.

Session: Exotica, Instrumentation, time: 11:10-11:35
Nanoscale NMR
Joerg Wrachtrup
Universität Stuttgart, Stuttgart, Germany
Increasing the sensitivity of NMR is a long standing challenging. Replacing the standard pick-up coils with more sensitive detectors is a strategy which has lead to SQUID and atom vapor cell detected NMR. In our approach, we use a novel quantum sensor to accomplish NMR on a few molecules. We demonstrate nanoscale quantum sensing and high resolution NMR[1-2]. We also made first steps to accomplish dynamic nuclear spin polarization (DNP) of protons using this technique [3].

References
[1] N. Aslam et al. Science 0.1126/science.aam8697 (2017)
[2] L. Schlipf et al. Science Advances 3:e1701116 (2017) DOI: 10.1126/sciadv.1701116
[3] F. Shagieva et al. submitted


Session: Exotica, Instrumentation, time: 11:35-11:50
Photonic Band-Gap Resonators for mm-Wave EPR and DNP NMR of Microliter-Volume Liquid Aqueous Samples
Alex I. Smirnov; Sergey Milikisiyants; Alexander A. Nevzorov
North Carolina State University, Raleigh, NC
A new line of high Q-factor resonators suitable for EPR and DNP NMR at millimeter wave frequencies is described. The resonators are based on one-dimensional photonic band-gap structures in which the sample represents a defect site. The structures were optimized by simulations and then tested by constructing prototypes for 95 and 200 GHz resonant frequencies. Room temperature experimental Q-factors of 95 GHz resonator reached ≈520 when empty and ≈450 when loaded with 1 μl of liquid aqueous sample. The resonators are readily scalable to higher millimeter wave frequencies and offers larger sample volumes for DNP than those currently achieved with either Fabri-Perot or cylindrical resonators. Initial DNP experiments at 200 GHz EPR/ 300 MHz 1H NMR frequencies are also demonstrated.

Session: Exotica, Instrumentation, time: 11:50-12:05
31P NMR Observations of Discrete Time-Crystalline Signatures in an Ordered Dipolar Solid: Robust Oscillations and a Novel DTC Echo 
Jared Rovny; Robert Blum; Sean Barrett
Yale University Physics Dept., New Haven, CT
The periodic spatial arrangement of atoms in a crystal like NaCl has been known for a century. The concept of a "discrete time crystal" (DTC) is a much more recent development (< 5 years old). It is one example of novel phases of matter proposed to exist in driven many-body systems. Recent experiments using ion traps and NV centers have found signatures of the DTC. Here, we present NMR evidence for the DTC, which provides important new constraints for theory. We also demonstrate a novel DTC-echo, revealing the `hidden' coherence produced by the DTC sequence. Lastly, we will explain how the DTC experiments are related to familiar NMR pulse sequences. NMR should be able to contribute to this research frontier.

Session: Exotica, Instrumentation, time: 12:05-12:20
1.5 GHz NMR using 36 T Series-Connected-Hybrid Magnet at NHMFL
Zhehong Gan1; Mark Bird1; William W. Brey1; Timothy A. Cross1; Peter L. Gor'kov1; Ivan Hung1; Ilya Litvak1; Joana Paulino1; Xiaoling Wang1; Pietro Lendi2; Jeffrey L. Schiano3; Eric G. Keeler4; Robert Griffin4; Gang Wu5
1NHMFL, Tallahassee, FL; 2Bruker, Faellanden, Switzerland; 3Penn State University, University Park, PA; 4Francis Bitter Magnet Lab and MIT, Cambridge, MA; 5Queen's University, Kingston, Canada

The NHMFL has commissioned a Series-Connected-Hybrid (SCH) magnet that generates homogeneous and stably regulated field up to 36T for high-resolution 1.5 GHz NMR and applications. A collection of initial results including solid-state and solution NMR of 17O and other quadrupolar nuclei, 14N overtone NMR showing the effect of magnetic field direction, 17O and 15N NMR of aligned membrane proteins and 2D 13C/15N magic-angle spinning NMR of model proteins will be presented.

Session: Exotica, Instrumentation, time: 12:20-12:35
High Resolution Magnetic Resonance Spectroscopy Using a Solid-State Spin Sensor
Dominik B. Bucher1, 2; David R. Glenn1; Junghyun Lee3; Mikhail D. Lukin1; Hongkun Park4; Ronald L. Walsworth1, 2
1Department of Physics, Harvard University, Cambridge, MA; 2Harvard Smithsonian Centre for Astrophysics, Cambridge, MA; 3Department of Physics, MIT, Cambridge, MA; 4Department of Chemistry, Harvard University, Cambridge, MA
The nitrogen vacancy (NV) center in diamond is a sensitive detector of nuclear magnetic resonance (NMR) signals, especially on short length scales. However, the best reported spectral resolution for NV-detected NMR of samples external to the diamond sensor ( >100 Hz) is insufficient to resolve key spectral signatures of molecular structures. Here we demonstrate a new experimental technique, combining a sensitive NV ensemble magnetometer with a new NV readout protocol to obtain a NMR spectral resolution of ~ 1 Hz. This technique can resolve J-couplings and chemical shifts of small organic molecules in sample volumes of ~ (10 µm)3 on top of a diamond chip. These capabilities enable high resolution NMR spectroscopy at the length scale of single cells.