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- Rene Descartes
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Physics Conference Room, SB B326
Coffee starts at 12:00 PM and talk starts at 12:15 PM
8
Jan '18
Mitsuteru Inoue  -  Monday, January 8, 2018
PDFDownload PDF iCaliCal file GoogleAdd to Google Calendar locationPhysics Conference Room, SB B326 coffee time2:45 pm talk time3:00 pm
ABSTRACT:
The introduction of artificial magnetic structures into magnetic materials can induce novel electromagnetic and spin-wave behavior. Nano- and submicrometer-scale artificial magnetic lattices (AMLs) can control optical (electromagnetic) waves in magnetophotonic crystals [1], volumetric magnetic holograms [2], and labyrinthian magnetic domain structures [3], and can affect spin waves in magnonic crystals [4].
     In this talk, the fundamental properties of such AMLs, mainly in magnetic garnet films and alloy thin films, are discussed, followed by demonstrations of their applications in optical and spin-wave micro-devices driven by magnetic phase interference: volumetric magneto-optic (MO) hologram memories [2] and three-dimensional MO holographic displays [5] with magnetophotonic crystals; high-speed MO Q-switch micro-chip lasers with iron-garnet films with labyrinthian magnetic domain structures [3]; and highly sensitive magnetic sensors and spinwave logic circuits with magnonic crystals [6].
     Prospective future spin-wave devices with AMLs will be discussed in the context of the new paradigm of magnonics (electron non-transport electronics), where spin waves play an important role as the information carrier.
 
[1] T. Goto et al., “Magnetophotonic crystal comprising electro-optical layer for controlling helicity of light,” J. Appl. Phys., 111, 07A913, 2012.
[2] Y. Nakamura et al., “Error-free reconstruction of magnetic hologram via improvement of recording conditions in collinear optical system,” Optics Exp., 25, 15349-15357, 2017.
[3] R. Morimoto et al., “Magnetic domains driving a Q-switched laser,” Sci. Rep., 6, 38679, 2016.
[4] N. Kanazawa et al., “Metal thickness dependence on spin wave propagation in magnonic .crystal using yttrium iron garnet,” J. Appl. Phys., 117, 17E510, 2015.
[5] K. Nakamura et al., “Improvement of diffraction efficiency of three-dimensional magnetooptic spatial light modulator with magnetophotonic crystal,” Appl. Phys. Lett., 108, 02240, 2016.
[6] N. Kanazawa et al., “Demonstration of a robust magnonic spin wave interferometer,” Sci. Rep., 6. 30268, 2016.
 
NOTES: Professor Inoue is IEEE Magnetics Society Distinguished Lecturer for 2018
29
Jan '18
Mircea Trif  -  Monday, January 29, 2018
ABSTRACT: The field of cavity quantum electrodynamics (cQED) with quantum conductors has become an extremely active field of research. The milestone year was 2004, when superconducting qubits have been integrated within a microwave cavity in order to reach, for the very first time in the condensed matter context, the strong coupling regime between photons and matter [1,2]. Since then, many other systems have been successfully coupled to microwave cavities, such as quantum wires [3], carbon nanotubes [4], quantum dots [5], etc. Such hybrid systems offer platforms for new kinds of physics, as one can engineer and manipulate the electromagnetic environment at will. The versatility of the cQED method relies on the fact that it allows to 1) monitor in a noninvasive fashion the electronic states in quantum conductors, both in equilibrium and non-equilibrium
situations, 2) to affect and manipulate the electronic transport, 3) to establish long-range correlations between remote quantum conductors and, finally, 4) it opens the pathway to create non-classical states of light by means of electronic transport.

In this talk, I will discuss some of these aspects for various types of quantum conductors out of equilibrium. I will focus on tunnel junctions [5], magnetic tunnel junctions [6], quantum dots [5] and Josephson junctions [7,8], respectively. I will show that one can reveal properties that are invisible in electronic transport (via the conductance), in particular in out-of-equilibrium situations pertaining to a large voltage bias applied over the quantum conductor [8]. For the case of voltage biased Josephson junction, I will show that the emitted radiation is non-classical in the sense that the photonic correlators violate some Cauchy-Schwarz inequalities [9]. I will confront the theory with some recent experimental studies where such violations have been measured [10].

References:
[1] A. Wallraf, D. I. Schuster, A. Blais et al., Nature 431, 162 (2004).
[2] A. Blais et al., Phys. Rev. A 69, 062320 (2004).
[3] K. D. Petersson et al., Nature 490, 380 (2012). [4] J. Viennot et al., Science 349, 6246 (2015).
[4] T. Frey et al., Phys. Rev. Lett. 108, 046807 (2010).
[5] Olesia Dmytruk, Mircea Trif, Christophe Mora, and Pascal Simon, Phys. Rev. B 93, 075425 (2016).
[6] Mircea Trif and Pascal Simon, Phys. Rev. B 90, 174431 (2014).
[7] Mircea Trif and Pascal Simon, Phys. Rev. B 92, 014503 (2015).
[8] O. Parlavecchio et al, Phys. Rev. Lett. 119, 137001 (2017).  
5
Feb '18
Sateesh Mane  -  Monday, February 5, 2018
Relativistic Spin Polarized Beams in Accelerators
Computer Science, Queens College
ABSTRACT: This talk will present an overview of the subject of relativistic spin polarized beams in particle accelerators. The focus will mainly be high energy accelerators (such as RHIC at Brookhaven National Lab), but lower energy machines for nuclear physics will also be discussed. Highlights such as the precision measurement of the mass of the Z0 boson at CERN will be treated.

http://iopscience.iop.org/article/10.1088/0034-4885/68/9/R01/pdf
26
Feb '18
Aditi Mitra  -  Monday, February 26, 2018
TBA
New York University
5
Mar '18
Donald Weingarten  -  Monday, March 5, 2018
Quantum Mechanics and the Macroscopic World
Indiana University, IBM Research, Finance
19
Mar '18
James Wynne  -  Monday, March 19, 2018
Illuminating My Career: From Flash Gordon to Laser Surgery
IBM Research Laboratory, Yorktown Heights
30
Apr '18
Jack Harris  -  Monday, April 30, 2018
TBA
Yale University