Bulletin of the American Physical Society
2020 Fall Meeting of the APS Prairie Section
Volume 65, Number 22
Friday–Sunday, November 13–15, 2020; Virtual
Session B03: Material Science and Quantum Materials |
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Chair: Jeff Terry, Illinois Institute of Technology |
Saturday, November 14, 2020 10:45AM - 11:15AM |
B03.00001: How Entanglement Uncovers Entanglement Invited Speaker: Gerardo Ortiz Can quantum entangled probes uncover the inherent entanglement of the target matter? We have recently developed a fundamentally new quantum probe, an entangled neutron beam, where individual neutrons can be entangled in spin, trajectory and energy. To demonstrate entanglement in these beams we crafted neutron interferometric measurements of contextuality inequalities whose violation provided an indication of the breakdown of Einstein's local realism. In turn, the tunable entanglement length of the neutron beam from nanometers to microns and energy differences from peV to neV opens a pathway to a future era of entangled neutron scattering in matter. What kind of information can be extracted with this novel entangled probe? A recent general quantum entangled-probe scattering theory provides a framework to respond to this question. Interestingly, by carefully tuning the probe's entanglement and inherent coherence properties, one can directly access the intrinsic entanglement of the target material. This theoretical framework supports the view that our entangled beam can be used as a multipurpose scientific tool. We are currently pursuing several ideas for future experiments in candidate quantum spin liquids, unconventional superconductors, and topological quantum materials. [Preview Abstract] |
Saturday, November 14, 2020 11:15AM - 11:45AM |
B03.00002: Behind the High Power Targetry R&D at Fermilab. Invited Speaker: Frederique Pellemoine A high-power target system is a key beam element to complete future High Energy Physics (HEP) experiments. In the recent past, major accelerator facilities have been limited in beam power not by their accelerators, but by the beam intercepting device survivability. The target must then endure high power pulsed beam, leading to high cycle thermal stresses/pressures and thermal shocks. The increased beam power will also create significant challenges such as corrosion and radiation damage that can cause harmful effects on the material and degrade their mechanical and thermal properties during irradiation. This can eventually lead to the failure of the material and drastically reduce the lifetime of targets and beam intercepting devices. In order to operate reliable beam-intercepting devices in the framework of energy and intensity increase projects of the future, it is essential to develop a strong R&D program and have synergy with various expertise. After presenting the high power targetry challenges facing next generation multi-MW accelerators, we will give an overview of Fermilab’s R&D program in support of High Power Targetry development. The RaDIATE collaboration (Radiation Damage In Accelerator Target Environment), managed by Fermilab, also draws on existing expertise in related fields to execute a coordinated strategy for high power targetry R&D between the 14 international member institutions. [Preview Abstract] |
Saturday, November 14, 2020 11:45AM - 12:15PM |
B03.00003: Quasiparticle Band Gap Tunability in Mono- to Few Layer Molybdenum Disulfide Invited Speaker: Daniel J. Trainer Quasi two-dimensional molybdenum disulfide (MoS 2 ) has emerged as an attractive candidate for next generation 2D semiconductor devices due to its substantial and tunable band gap 1,2 . Controlling the band gap of single layer MoS 2 has been the focus of significant research effort as it offers complimentary functionality to metallic or semi-metallic 2D materials. In this work, we investigate the effect of various tuning knobs, such as crystallographic orientation 3 and strain 4 , on the magnitude of the quasiparticle band gap of MoS 2 . We employ low temperature scanning tunneling microscopy and spectroscopy (STM/STS) to obtain quantitative measurements of the local electronic density of states on the atomic scale. Measurements were performed on mono- to few layer MoS 2 films grown by ambient pressure chemical vapor deposition (AP-CVD). Additionally, Green’s function based electronic structure calculations were carried out in order to shed light on the mechanisms at play responsible for changes in the band gap. \\ \\In Collaboration With: Yuan Zhang (2), Aleksei V. Putilov (2) , Cinzia Di Giorgio (2) , Boakai Wang (3) , Xiaoxing Xi (2) , Fabrizio Bobba (2,4) , Saw Hla (1) , Jouko Nieminen (3,5) , Arun Bansil (3) , Maria Iavarone (2). \\ \\1. Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, United States. 2. Physics Department, Temple University, Philadelphia, PA, United States. 3. Physics Department, Northeastern University, Boston, Massachusetts 02115, United States 4. Physics Department, Salerno University, Salerno, Italy. 5. Computational Physics Laboratory, Tampere University, Tampere 33014, Finland [Preview Abstract] |
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