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Total 100 eventos
Agenda de eventos
FechaEvento
23/01/2018 - 23/01/2018Nanoscale magnetic and thermal imaging in quantum systems

 

Abstract:  

NanoSQUIDs residing on the apex of a quartz tip (SOT), suitable for scanning probe microscopy with record size, spin sensitivity, and thermal sensitivity are presented[1,2]. We have developed SOT with an effective diameter smaller than 50 nm, spin sensitivity better than a single electron spin and thermal sensitivity better than 1 μK/Hz1/2. This technique is used to study nanoscale magnetism present in systems such as atomically sharp LaMnO3/SrTiO3 (LMO/STO) heterostructures[3] and to study dissipation mechanism in quantum system such as hBN-encapsulated graphene[2,4]. Magnetic imaging of LMO/STO revealed a superparamagnetic behavior resulting from an electronic phase separation leading to nucleation of metallic ferromagnetic islands in an insulating antiferromagnetic matrix. Thermal imaging of hBN-encapsulated graphene reveals a fascinating atomic-scale dissipation mechanism providing visualization and control of phonon emission from inelastic electron scattering off individual atomic defects[4], opening the door to direct imaging and spectroscopy of dissipation processes in quantum systems.

 

References:

[1] D. Vasyukov, Y. Anahory, L. Embon, D. Halbertal, J. Cuppens, L. Neeman, A. Finkler, Y. Segev, Y. Myasoedov, M. L. Rappaport, M. E. Huber, and E. Zeldov, Nature Nanotech. 8, 639 (2013)

[2] D. Halbertal, J. Cuppens, M. Ben Shalom, L. Embon, N. Shadmi, Y. Anahory, H. R. Naren, J. Sarkar, A. Uri, Y. Ronen, Y. Myasoedov, L. S. Levitov, E. Joselevich, A. K. Geim, and E. Zeldov, Nature 539, 407 (2016).

[3] Y. Anahory, L. Embon, C. J. Li, S. Banerjee, A. Meltzer, H. R. Naren, A. Yakovenko, J. Cuppens, Y. Myasoedov, M. L. Rappaport, M. E. Huber, K. Michaeli, T. Venkatesan, and E. Zeldov, Nature Communications 8, 85 (2016)

[4] D. Halbertal, M. Ben Shalom, A. Uri, K. Bagani, A.Y. Meltzer, I. Marcus, Y. Myasoedov, J. Birkbeck, L.S. Levitov, A.K. Geim, and E. Zeldov, Science 358, 1303 (2017).

 

Más información: http://www.ifimac.uam.es/category/seminars/

 

19/01/2018 - 19/01/2018Interfacing magnetic molecules with 2D materials

 

Abstract:  

Graphene and other 2D materials have been a hot focus of interest in physics, chemistry and materials science. The emergence of van der Waals heterostructures formed by assembling two different monolayers of these materials through Van der Waals forces have opened new opportunities in this field. This concept can be further expanded by interfacing a layered 2D material with materials of other dimensionalities including 0D materials (molecules, nanoparticles,…), 1D materials (nanotubes, nanowires,…) and 3D materials, which can interact non only through VdW forces but also through covalent or ionic interactions [1].

In this talk I will focus on an emergent class of hybrid heterostructures formed by interfacing a 2D material with a molecular system. In particular, I will show how the properties of the “all surface” 2D material can be tuned through the interactions established with the molecular system. As 2D materials, I will focus on those exhibiting superconductivity or magnetism. As molecular systems, I will focus on stimuli-responsive magnetic molecules able to change their properties upon the application of an external stimulus (temperature, light or pressure) [2]. I will show that this concept can provide examples of smart molecular/2D heterostructures [3], which may be at the origin of a novel generation of hybrid materials and devices of direct application in highly topical fields like electronics, spintronics, molecular sensing and energy storage.

 

References:

[1] D. Jariwala, et al., Nature Mater 2017, 16, 170

[2] A. Bousseksou et al. Chem. Soc. Rev., 2011, 40, 3313.

[3] J. Dugay et al. Nano Lett. 2017, 17, 186

 

Macintosh HD:Users:aforment:Documents08:Forment:Proyectos:ERC_Eugenio2017:figures:SCO_GH2.png

 

Más información: http://www.ifimac.uam.es/category/conferences-events

 

 

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17/01/2018 - 17/01/2018The Mechanics of Cell Shape in Early Embryonic Development

 

 

 

 

 

 

16/01/2018 - 16/01/2018Situación actual de las terapias de antienvejecimiento

 

 

15/12/2017 - 15/12/2017Geometry invariant phenomena in near zero index media

Abstract:  

Continuous media and metamaterials with a near-zero refractive index (NZI media) provide alternative pathways for the control and manipulation of light-matter interactions.  The exotic behavior of NZI media is rooted in the fact that the wavelength gets effectively stretched as the refractive index vanishes. This allows for pathological solutions to the wave equation, including   spatially static fields distributions which nevertheless dynamically oscillate in time. This paradoxical behavior gives access to a regime of qualitatively different wave dynamics, where the importance of the geometry is lessened, and certain observables are invariant with respect to geometrical deformations, even including changes in the topology of the system.

 

In this talk, I’ll review and discuss some of the geometry-invariant phenomena related to near-zero-index media. Examples will include: (i) transmission (tunneling) of waves through deformed waveguides. (ii) Unconventional resonators supporting modes whose eigenfrequency is independent of the geometry of their external boundary. (iii) Violation of effective medium theory geometrical restrictions, enabling, for example, single unit-cell metamaterials. (iv) Existence of bound states in open 3D compact resonators with arbitrarily shaped boundaries.

Different technological applications and implementations of these concepts will be discussed.

 

Más información: http://www.ifimac.uam.es/category/seminars/

 

Destacados

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Generales

Total 100 eventos
Agenda de eventos
FechaEvento
23/01/2018 - 23/01/2018Nanoscale magnetic and thermal imaging in quantum systems

 

Abstract:  

NanoSQUIDs residing on the apex of a quartz tip (SOT), suitable for scanning probe microscopy with record size, spin sensitivity, and thermal sensitivity are presented[1,2]. We have developed SOT with an effective diameter smaller than 50 nm, spin sensitivity better than a single electron spin and thermal sensitivity better than 1 μK/Hz1/2. This technique is used to study nanoscale magnetism present in systems such as atomically sharp LaMnO3/SrTiO3 (LMO/STO) heterostructures[3] and to study dissipation mechanism in quantum system such as hBN-encapsulated graphene[2,4]. Magnetic imaging of LMO/STO revealed a superparamagnetic behavior resulting from an electronic phase separation leading to nucleation of metallic ferromagnetic islands in an insulating antiferromagnetic matrix. Thermal imaging of hBN-encapsulated graphene reveals a fascinating atomic-scale dissipation mechanism providing visualization and control of phonon emission from inelastic electron scattering off individual atomic defects[4], opening the door to direct imaging and spectroscopy of dissipation processes in quantum systems.

 

References:

[1] D. Vasyukov, Y. Anahory, L. Embon, D. Halbertal, J. Cuppens, L. Neeman, A. Finkler, Y. Segev, Y. Myasoedov, M. L. Rappaport, M. E. Huber, and E. Zeldov, Nature Nanotech. 8, 639 (2013)

[2] D. Halbertal, J. Cuppens, M. Ben Shalom, L. Embon, N. Shadmi, Y. Anahory, H. R. Naren, J. Sarkar, A. Uri, Y. Ronen, Y. Myasoedov, L. S. Levitov, E. Joselevich, A. K. Geim, and E. Zeldov, Nature 539, 407 (2016).

[3] Y. Anahory, L. Embon, C. J. Li, S. Banerjee, A. Meltzer, H. R. Naren, A. Yakovenko, J. Cuppens, Y. Myasoedov, M. L. Rappaport, M. E. Huber, K. Michaeli, T. Venkatesan, and E. Zeldov, Nature Communications 8, 85 (2016)

[4] D. Halbertal, M. Ben Shalom, A. Uri, K. Bagani, A.Y. Meltzer, I. Marcus, Y. Myasoedov, J. Birkbeck, L.S. Levitov, A.K. Geim, and E. Zeldov, Science 358, 1303 (2017).

 

Más información: http://www.ifimac.uam.es/category/seminars/

 

19/01/2018 - 19/01/2018Interfacing magnetic molecules with 2D materials

 

Abstract:  

Graphene and other 2D materials have been a hot focus of interest in physics, chemistry and materials science. The emergence of van der Waals heterostructures formed by assembling two different monolayers of these materials through Van der Waals forces have opened new opportunities in this field. This concept can be further expanded by interfacing a layered 2D material with materials of other dimensionalities including 0D materials (molecules, nanoparticles,…), 1D materials (nanotubes, nanowires,…) and 3D materials, which can interact non only through VdW forces but also through covalent or ionic interactions [1].

In this talk I will focus on an emergent class of hybrid heterostructures formed by interfacing a 2D material with a molecular system. In particular, I will show how the properties of the “all surface” 2D material can be tuned through the interactions established with the molecular system. As 2D materials, I will focus on those exhibiting superconductivity or magnetism. As molecular systems, I will focus on stimuli-responsive magnetic molecules able to change their properties upon the application of an external stimulus (temperature, light or pressure) [2]. I will show that this concept can provide examples of smart molecular/2D heterostructures [3], which may be at the origin of a novel generation of hybrid materials and devices of direct application in highly topical fields like electronics, spintronics, molecular sensing and energy storage.

 

References:

[1] D. Jariwala, et al., Nature Mater 2017, 16, 170

[2] A. Bousseksou et al. Chem. Soc. Rev., 2011, 40, 3313.

[3] J. Dugay et al. Nano Lett. 2017, 17, 186

 

Macintosh HD:Users:aforment:Documents08:Forment:Proyectos:ERC_Eugenio2017:figures:SCO_GH2.png

 

Más información: http://www.ifimac.uam.es/category/conferences-events

 

 

--

17/01/2018 - 17/01/2018The Mechanics of Cell Shape in Early Embryonic Development

 

 

 

 

 

 

16/01/2018 - 16/01/2018Situación actual de las terapias de antienvejecimiento

 

 

15/12/2017 - 15/12/2017Geometry invariant phenomena in near zero index media

Abstract:  

Continuous media and metamaterials with a near-zero refractive index (NZI media) provide alternative pathways for the control and manipulation of light-matter interactions.  The exotic behavior of NZI media is rooted in the fact that the wavelength gets effectively stretched as the refractive index vanishes. This allows for pathological solutions to the wave equation, including   spatially static fields distributions which nevertheless dynamically oscillate in time. This paradoxical behavior gives access to a regime of qualitatively different wave dynamics, where the importance of the geometry is lessened, and certain observables are invariant with respect to geometrical deformations, even including changes in the topology of the system.

 

In this talk, I’ll review and discuss some of the geometry-invariant phenomena related to near-zero-index media. Examples will include: (i) transmission (tunneling) of waves through deformed waveguides. (ii) Unconventional resonators supporting modes whose eigenfrequency is independent of the geometry of their external boundary. (iii) Violation of effective medium theory geometrical restrictions, enabling, for example, single unit-cell metamaterials. (iv) Existence of bound states in open 3D compact resonators with arbitrarily shaped boundaries.

Different technological applications and implementations of these concepts will be discussed.

 

Más información: http://www.ifimac.uam.es/category/seminars/

 

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Agentes y colaboradores

  • Universidad Autónoma de Madrid
  • CSIC
  • ASEYACOVI
  • ACENOMA
  • AICA
  • Centro de Microanálisis de Materiales (CMAM)
  • Centro de Investigación en Física de la Materia Condensada (IFIMAC)
  • CBMSO - Centro de Biología Molecular Severo Ochoa
  • CIAL - Centro de Investigación en Ciencias de la Alimentación
  • CNB - Centro Nacional de Biotecnología 
  • Centro de Iniciativas Emprendedoras (CIADE)
  • Cámara de Madrid
  • FEMAN
  • Fundación Universitaria Autónoma de Madrid
  • ICMAT - Instituto de Ciencias Matemáticas
  • ICMM - Instituto de Ciencia de Materiales de Madrid
  • ICP - Instituto de Catálisis y Petroquímica
  • ICV - Instituto de Cerámica y Vidrio
  • IFT - Instituto de FísicaTeórica
  • IIBM - Instituto de Investigaciones Biomédicas Alberto Sols
  • IMDEA - Alimentación
  • IMDEA - Nanociencia
  • IMM - Instituto de Microelectrónica de Madrid
  • InNorMadrid
  • Parque Científico de Madrid
  • Oficina de Transferencia de Resultados de la Investigación (OTRI) de la UAM
  • Facultad de Ciencias
  • Facultad de Ciencias Económicas y Empresariales
  • Facultad de Derecho
  • Facultad de Filosofía y Letras
  • Facultad de Medicina
  • Facultad de Formación de Profesorado y Educación
  • Facultad de Psicología
  • Escuela Politécnica Superior
Proyecto realizado con ayudas concedidas por el Ministerio de Economía y Competitividad / EXPEDIENTE: CEI10-1-0009 CEI UAM+CSIC: INNOCAMPUS 2010 Proyecto financiado por el Ministerio de Educación, Cultura y Deporte, y el Ministerio de Economía y Competitividad en el marco del Programa Campus de Excelencia Internacional/ EXPEDIENTE: CEI10-1-0009 CEI UAM+CSIC: INNOCAMPUS 2010