Bachelor of Science (Honours): Physics and Computer Science

Transcription

1 Dr. Brad Ramshaw Curriculum Vitae Pulsed Field Facility Los Alamos National Laboratory TA-35, Buildilng 127, E536 Los Alamos, NM, Education Phone: Doctorate in Physics University of British Columbia Supervisor: Dr. Doug Bonn Thesis: Shubnikov-de Haas Measurements and the Spin Magnetic Moment of YBa 2 Cu 3 O 6.59 GPA: 89.1/100 Bachelor of Science (Honours): Physics and Computer Science University of British Columbia Supervisor: Dr. Doug Bonn Honours Thesis: Microwave Properties of Bismuth GPA: 79.0/100 Honours and Scholarships Directors Fellow: Los Alamos National Labs 2013 Directors fellowship funding at Los Alamos National Labs for two year term starting Sept Outstanding Poster Award: Winner 2013 Los Alamos post-doc research day. 9 winners, 90 entries from 17 divisions. Martin and Beate Block Physics Award 2011 Awarded for best work by a young physicist at the Aspen Winter Physics Conference: Contrasting Superconductivity of Pnictides and Cuprates. Natural Sciences and Engineering Research Council Post-Graduate Scholarship - Doctorate Canada-wide competitive scholarship. Four Year Fellowship for PhD Students Internal competitive award at the University of British Columbia. Virginia Graczak Music Scholarship 2002 Competitive scholarship in classical piano performance. Employment Postdoctoral Researcher August Present Los Alamos National Labs. Resonant ultrasound spectroscopy and pulsed field transport on high-t c and heavy Fermion superconductors. Doctoral Student September July 2012 University of British Columbia. Shubnikov-de Haas oscillations in c-axis transport of YBa 2 Cu 3 O 6+δ ; Tl-2201 microwave penetration depth. Course Specific Teaching Assistant September May 2012 University of British Columbia. Training of other teaching assistants for the undergrad physics laboratory, course material development, lab instruction. Undergraduate Research Assistant May September 2007 University of British Columbia. DC resistivity measurements on YBa 2 Cu 3 O 6+δ ; instrument automation with Labview software; microwave measurements on YBa 2 Cu 3 O 6+δ. 1

2 Peer Reviewed Publications [1] B. J. Ramshaw, S. E. Sebastian, R. D. McDonald, James Day, B. S. Tan, Z. Zhu, J. B. Betts, Ruixing Liang, D. A. Bonn, W. N. Hardy, and N. Harrison. Quasiparticle mass enhancement approaching optimal doping in a high-tc superconductor. Science, 2015 [2] B. J. Ramshaw, Arkady Shekhter, Ross D. McDonald, Jon B. Betts, J. N. Mitchell, P. H. Tobash, C. H. Mielke, E. D. Bauer, and Albert Migliori. Avoided valence transition in a plutonium superconductor. Proceedings of the National Academy of Sciences, 112(11): , 2015 [3] N Doiron-Leyraud, S Badoux, S René de Cotret, S Lepault, D LeBoeuf, F Laliberté, E Hassinger, B. J. Ramshaw, DA Bonn, WN Hardy, et al. Evidence for a small hole pocket in the fermi surface of underdoped YBa 2 Cu 3 O y. Nature Communications, 6, 2015 [4] G Grissonnanche, F Laliberte, S Dufour-Beausejour, M Matusiak, S Badoux, FF Tafti, B Michon, A Riopel, O Cyr-Choiniere, JC Baglo, B. J. Ramshaw, R. Liang, D. A. Bonn, W. N. Hardy, S. Kramer, D. LeBoeuf, D. Graf, N. Doiron- Leyraud, and L. Taillefer. Wiedemann-franz law in the underdoped cuprate superconductor YBa 2 Cu 3 O y. arxiv preprint arxiv: , 2015 [5] N Shapira, Y Lamhot, O Shpielberg, Y Kafri, B. J. Ramshaw, DA Bonn, Ruixing Liang, WN Hardy, and OM Auslaender. Disorder induced power-law response of a superconducting vortex on a plane. arxiv preprint arxiv: , 2014 [6] G Grissonnanche, O Cyr-Choiniere, F Laliberte, S Rene de Cotret, A Juneau- Fecteau, S Dufour-Beausejour, M-E Delage, D LeBoeuf, J Chang, B. J. Ramshaw, D. A. Bonn, W. N. Hardy, Ruixing Liang, S. Adachi, N. E. Hussey, B. Vignolle, C. Proust, M. Sutherland, S. Kramer, J.-H. Park, D. Graf, N. Doiron-Leyraud, and Louis. Taillefer. Direct measurement of the upper critical field in a cuprate superconductor. Nature Communications, 5, Feb 2014 [7] A. Shekhter, B. J. Ramshaw, R. D. McDonald, J. B. Betts, F. Balakirev, Ruixing Liang, W. N. Hardy, D. A. Bonn, Scott C. Riggs, and Albert Migliori. Bounding the pseudogap with a line of phase transitions in YBa 2 Cu 3 O 6+δ. Nature, 498(7452):75 77, 2013 [8] B. J. Ramshaw, James Day, Baptiste Vignolle, David LeBoeuf, P. Dosanjh, Cyril Proust, Louis Taillefer, Ruixing Liang, W. N. Hardy, and D. A. Bonn. Vortex lattice melting and H c2 in underdoped YBa 2 Cu 3 O 6+δ. Phys. Rev. B, 86:174501, Nov 2012 [9] B. Vignolle, B. J. Ramshaw, James Day, David LeBoeuf, Stéphane Lepault, Ruixing Liang, W. N. Hardy, D. A. Bonn, Louis Taillefer, and Cyril Proust. Coherent c-axis transport in the underdoped cuprate superconductor YBa 2 Cu 3 O 6+δ. Physical Review B, 85(22):224524, 2012 [10] B. J. Ramshaw, Baptiste Vignolle, James Day, Ruixing Liang, W. N. Hardy, Cyril Proust, and D. A. Bonn. Angle dependence of quantum oscillations in YBa 2 Cu 3 O 6.59 shows free-spin behaviour of quasiparticles. Nature Physics, 7(3): , Mar 2011 [11] J. Chang, Nicolas Doiron-Leyraud, Francis Laliberté, R. Daou, David LeBoeuf, B. J. Ramshaw, Ruixing Liang, D. A. Bonn, W. N. Hardy, Cyril Proust, I. Sheikin, K. Behnia, and Louis Taillefer. Nernst effect in the cuprate superconductor YBa 2 Cu 3 O y : Broken rotational and translational symmetries. Phys. Rev. B, 84:014507, Jul

3 [12] David LeBoeuf, Nicolas Doiron-Leyraud, B. Vignolle, Mike Sutherland, B. J. Ramshaw, J. Levallois, R. Daou, Francis Laliberté, Olivier Cyr-Choinière, Johan Chang, Y. J. Jo, L. Balicas, Ruixing Liang, D. A. Bonn, W. N. Hardy, Cyril Proust, and Louis Taillefer. Lifshitz critical point in the cuprate superconductor YBa 2 Cu 3 O 6+δ from high-field hall effect measurements. Phys. Rev. B, 83:054506, Feb 2011 [13] F. Laliberte, J. Chang, N. Doiron-Leyraud, E. Hassinger, R. Daou, M. Rondeau, B. J. Ramshaw, R. Liang, D. A. Bonn, W. N. Hardy, S. Pyon, T. Takayama, H. Takagi, I. Sheikin, L. Malone, C. Proust, K. Behnia, and Louis Taillefer. Fermi-surface reconstruction by stripe order in cuprate superconductors. Nature Communications, 2, Aug 2011 [14] Baptiste Vignolle, David Vignolles, David LeBoeuf, Stéphane Lepault, Brad Ramshaw, Ruixing Liang, DA Bonn, WN Hardy, Nicolas Doiron-Leyraud, A Carrington, N. E. Hussey, Louis Taillefer, and Cyril Proust. Quantum oscillations and the Fermi surface of high-temperature cuprate superconductors. Comptes Rendus Physique, 12(5): , 2011 [15] J. S. Bobowski, J. C. Baglo, James Day, P. Dosanjh, Rinat Ofer, B. J. Ramshaw, Ruixing Liang, D. A. Bonn, W. N. Hardy, Huiqian Luo, Zhao-Sheng Wang, Lei Fang, and Hai-Hu Wen. Precision microwave electrodynamic measurements of K- and Codoped BaFe 2 As 2. Phys. Rev. B, 82:094520, Sep 2010 [16] R. Daou, J. Chang, David LeBoeuf, Olivier Cyr-Choinière, Francis Laliberte, Nicolas Doiron-Leyraud, B. J. Ramshaw, Ruixing Liang, D. A. Bonn, W. N. Hardy, and Louis Taillefer. Broken rotational symmetry in the pseudogap phase of a high-t c superconductor. Nature, 463(7280): , Jan 2010 [17] J. Chang, R. Daou, Cyril Proust, David LeBoeuf, Nicolas Doiron-Leyraud, Francis Laliberté, B. Pingault, B. J. Ramshaw, Ruixing Liang, D. A. Bonn, W. N. Hardy, H. Takagi, A. B. Antunes, I. Sheikin, K. Behnia, and Louis Taillefer. Nernst and seebeck coefficients of the cuprate superconductor YBa 2 Cu 3 O 6.67 : A study of fermi surface reconstruction. Phys. Rev. Lett., 104:057005, Feb 2010 [18] David LeBoeuf, Nicolas Doiron-Leyraud, Julien Levallois, R. Daou, J.-B. Bonnemaison, N. E. Hussey, L. Balicas, B. J. Ramshaw, Ruixing Liang, D. A. Bonn, W. N. Hardy, S. Adachi, Cyril Proust, and Louis Taillefer. Electron pockets in the fermi surface of hole-doped high-t c superconductors. Nature, 450(7169): , Nov h-index 12 Invited Talks University of Chicago 2015 Department of Physics Colloquium Stanford University 2015 Condensed Matter Physics Seminar University of Washington 2014 Department of Physics Colloquium University of California, Berkeley K Series Superstripes 2014, Erice, Sicily 2014 Stanford University 2014 Condensed Matter Physics Seminar 3

4 University of California, Los Angeles 2014 Physics and Astronomy Colloquium Materials Research Society Spring Meeting 2014, San Francisco University of Maryland, College Park 2014 CNAM Condensed Matter Colloquium University of British Columbia, Vancouver 2014 Aspen Winter Physics Conference 2014 Unconventional Order in Strongly Correlated Electron Systems. Cornell University, Ithaca 2013 Laboratory of Atomic and Solid State Physics Seminar Canadian Institute for Advanced Research, Vancouver 2013 Quantum Materials Meeting University of California, Los Angeles 2012 University of British Columbia, Vancouver 2011 International Summer School on Surfaces and Interfaces in Correlated oxides Aspen Winter Physics Conference 2011 Contrasting Superconductivity of Pnictides and Cuprates Physical Phenomena at High Magnetic Fields VII, Tallahassee, Florida 2010 University of British Coulumbia, Vancouver 2009 Contributed Presentations American Physical Society March Meeting, San Antonio,Texas 2015 Los Alamos Post-Doc Research Day, Los Alamos, New Mexico 2013 Poster presentation American Physical Society March Meeting, Baltimore, Maryland 2013 Gordon Research Conference on Correlated Electron Systems, Mount Holyoke College, Massachusetts 2010 Poster presentation American Physical Society March Meeting, Portland, Oregon 2010 American Physical Society March Meeting, Pittsburgh, Pennsylvania 2009 Conference Organization and Outreach Canadian Institute for Advanced Research Summer School: organizer 2009 One of 3 PhD students that organized a 3-day summer school at UBC, including food, accommodation, and lecture venues for over 90 students and 10 speakers. Let s Talk Science: volunteer Visited elementary school classrooms, giving science demonstrations and organizing group activities for grades 1 and 2 students. 4

5 Physics in the Field Seminar Series: co-founder and organizer Started at seminar series at the pulsed field facility at Los Alamos National Labs, with a focus on bringing in PhD students from across the country to talk about their latest research. 5