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Condensed Matter Seminar

CANCELLED. Sebastian Deffner, University of Maryland Baltimore County
Speaker: CANCELLED. Sebastian Deffner, University of Maryland Baltimore County Title: TBA Abstract: Host: Ar. Abanov

19 Jan 2018, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Brian La Cour, UT Austin
Speaker: Brian La Cour, UT Austin Title: TBA Abstract: Host: Helmut Katzgraber

26 Jan 2018, 4:00PM | MIST M102
Hosted By: Helmut Katzgraber


Jing Xia, University of California, Irvine
Speaker: Jing Xia, University of California, Irvine Title: Studying 2D magnetism and superconductivity with a Sagnac MOKE microscope Abstract: In this talk, I will discuss our recent results on 2D magnetism and superconductivity using a scanning Sagnac MOKE microscope, which is based on a Sagnac interferometer technique first developed at Stanford [1], and has achieved unprecedented nanoradian level Kerr and Fraday sensitivity even at DC. In exfoliated Cr2Ge2Te6 (CGT) atomic layers, we report [1] the discovery of intrinsic ferromagnetism in 2D van der Walls crystals, defying the well-known Mermin-Wagner theorem. Unlike 3D magnetism, the ferromagnetic order in this 2D system is stabilized by magnetic anisotropy from the CGT structure, which is not present in graphene. As a result, changing the magnetic anisotropy with a small external magnetic field was found to strongly enhance the Curie temperature, which is a feature unique to 2D magnetism. An emerging alternative route for developing new multifunctional perovskite is by modification of the oxygen octahedral structure. We demonstrate [2] the control of structural oxygen octahedral rotation in ultrathin perovskite SrRuO3 films by the deposition of a SrTiO3 capping layer, which can be patterned to achieve local control. We show an increase in the Curie temperature of SrRuO3 due to the suppression octahedral rotations revealed by the synchrotron x-ray diffraction. In epitaxial Bi/Ni bilayer samples, we report [3] the observation of 2D superconductivity that spontaneously breaks time-reversal symmetry (TRS). Because of strong spin-orbit interaction and lack of inversion symmetry in a Bi/Ni bilayer, superconducting pairing cannot be classified as singlet or triplet. We propose a theoretical model where magnetic fluctuations in Ni induce the superconducting pairing of the dxy ± idx2+y2 orbital symmetry between the electrons in Bi. In this model, the order parameter has a nonzero phase winding number around the Fermi surface, thus making it a rare example of a 2D topological superconductor. We will also discuss a more recent result of realizing a spin-polirized 2D electron gas between two non-magnetic insulators. 1. “Discovery of intrinsic ferromagnetism in 2D van der Waals crystals”, Nature, 546, 265-269 (2017). 2. “Localized Control of Curie Temperature in Perovskite Oxide Film by Capping-layer-induced Octahedral Distortion”, Phys. Rev. Lett. , 119, 177203 (2017). 3. “Time-Reversal-Symmetry-Breaking Superconductivity in Epitaxial Bismuth/Nickel Bilayers”, Science Advances, 3, 3, e1602579 (2017). Host: Ar. Abanov

2 Feb 2018, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Chandra Varma, UC Riverside
Speaker: Chandra Varma, UC Riverside Title: TBA Abstract: Host: Ar. Abanov

9 Feb 2018, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Cristian Cernov, TAMU
Speaker: Cristian Cernov, TAMU Title: A New Technoogical Paradigm: Blockchain. Abstract: Host: Ar. Abanov

16 Feb 2018, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Arkady Shekhter, NHMFL
Speaker: Arkady Shekhter, NHMFL Title: TBA Abstract: Host: A. Finkelstein

23 Feb 2018, 4:00PM | MIST M102
Hosted By: A. Finkelstein


Rahul Mahajan Nandkishore, UC Boulder
Speaker: Rahul Mahajan Nandkishore, UC Boulder Title: TBA Abstract: Host: Ar. Abanov

2 Mar 2018, 4:00PM | MIST M102
Hosted By: Ar. Abanov


APS March meeting, Los Angeles, CA
Speaker: APS March meeting, Los Angeles, CA Title: Abstract: Host:

9 Mar 2018, 4:00PM | MIST M102


Spring Break
Speaker: Spring Break Title: Abstract: Host:

16 Mar 2018, 4:00PM | MIST M102


Ania Bleszynski Jayich, UCSB
Speaker: Ania Bleszynski Jayich, UCSB Title: The NV center in diamond: a versatile quantum technology Abstract: The nitrogen vacancy (NV) center in diamond is an atomic-­scale defect that exhibits remarkably coherent quantum properties in a uniquely accessible way: at room temperature, in ambient conditions, and even immersed in biological environments. NV centers are being explored for a variety of quantum technologies, including quantum sensing and quantum information processing. In this talk, I introduce the physics and materials science behind the success of the NV center and I highlight some of the major achievements of NV-­based quantum sensors, the most advanced of NV-­based technologies. I present a versatile NV-­based imaging platform where we have incorporated an NV center into a scanning probe microscope and used it to image vortices in superconductors [1], skyrmions in thin film magnetic multilayers, and conductivity on the nanoscale. I also outline the challenges facing the widespread use of NV centers in quantum applications. One major challenge is mitigating surface-­induced quantum decoherence, a universal problem that affects many quantum technologies. With its sensitivity to electric and magnetic fields over a wide range of frequencies, we have used the NV center as a noise spectrometer [2,3] to spectroscopically probe sources of surface and bulk-­related decoherence, differentiating between electric and magnetic origins. These studies guide the ongoing development of quantum control and diamond surface preparation techniques, pushing towards the ultimate goal of NV-­based single nuclear spin imaging. References [1] M. Pelliccione et al, Nature Nanotechnology 11, 700 (2016) [2] B. Myers et al, PRL 113, 027602 (2014) [3] B. Myers et al, PRL 118, 197201 (2017). Host:

23 Mar 2018, 4:00PM | MIST M102


Good Friday
Speaker: Good Friday Title: Abstract: Host:

30 Mar 2018, 4:00PM | MIST M108


Physics Festival
Speaker: Physics Festival Title: Abstract: Host:

6 Apr 2018, 4:00PM | MIST M102


Marco Nardelli, University of North Texas
Speaker: Marco Nardelli, University of North Texas Title: TBA Abstract: Host: Joseph Ross

13 Apr 2018, 4:00PM | MIST M102
Hosted By: Joseph Ross


OPEN
Speaker: OPEN Title: Abstract: Host:

20 Apr 2018, 4:00PM | MIST M102


Michael Levin, University of Chicago
Speaker: Michael Levin, University of Chicago Title: TBA Abstract: Host: Ar. Abanov

27 Apr 2018, 4:00PM | MIST M102
Hosted By: Ar. Abanov


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