Campus de Excelencia InterncionalCampus of International Excellence

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Total 100 eventos
Agenda de eventos
FechaEvento
27/04/2018 - 27/04/2018Building cortical networks from molecules to function

Ponente: Beatriz Rico

MRC Centre for Neurodevelopmental Disorders, King´s Collegue London, london, UK

19/04/2018 - 19/04/2018Valence Fluctuations and Unusual Correlations in Superconducting Pb1 xTlxTe

Abstract:  

The narrow-band semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable low-density metals, but only when it is doped with valence-skipping elements. There is strong experimental evidence that upon hole-doping PbTe with Tl the onset of superconductivity occurs as the chemical potential is tuned to a point of degeneracy of the Tl 1+ and 3+ valences. At these compositions the Tl dopants can dynamically skip valence by filling and emptying their 6s shell of two electrons simultaneously, naturally raising the question of whether Tl dopants can act as a negative U center to produce the enhanced superconductivity seen in this compound.

 

Here we present a study of the quantum oscillations, electrical transport and specific heat of hole-doped PbTe in which we use a series of non-superconducting, non-valence skipping Na doped samples as a control system for the Tl doped series described above. We identify the presence of an unusual 2e resonant impurity state that is unique to the superconducting portion of the Tl series, and appears to be enhancing, or even introducing, the pairing interaction in this material. This realization of a pairing interaction that is introduced extrinsically to a host material could guide the design of improved superconducting materials.

 

cid:11516B45-23FD-4C4E-8D2F-D1F4A0DFC39D

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

 

Dear all:

 

A new IFIMAC Conference will  take place on Thursday; April 19th at the  Condensed Matter Physics Center (IFIMAC )

You will find all the information below.

 

WHEN: Thursday; April 19th (2018); 12.00 h

WHERE: Dpto. Física de la Materia Condensada, Facultad Ciencias, Module 3, Seminar Room (5th Floor)

 

SPEAKER: Phil Walmsley (Stanford University)

 

TITLE: Valence Fluctuations and Unusual Correlations in  Superconducting Pb1-xTlxTe

 

ABSTRACT:

The narrow-band semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable low-density metals, but only when it is doped with valence-skipping elements. There is strong experimental evidence that upon hole-doping PbTe with Tl the onset of superconductivity occurs as the chemical potential is tuned to a point of degeneracy of the Tl 1+ and 3+ valences. At these compositions the Tl dopants can dynamically skip valence by filling and emptying their 6s shell of two electrons simultaneously, naturally raising the question of whether Tl dopants can act as a negative U center to produce the enhanced superconductivity seen in this compound.

 

Here we present a study of the quantum oscillations, electrical transport and specific heat of hole-doped PbTe in which we use a series of non-superconducting, non-valence skipping Na doped samples as a control system for the Tl doped series described above. We identify the presence of an unusual 2e resonant impurity state that is unique to the superconducting portion of the Tl series, and appears to be enhancing, or even introducing, the pairing interaction in this material. This realization of a pairing interaction that is introduced extrinsically to a host material could guide the design of improved superconducting materials.

 

More information: http://www.ifimac.uam.es/category/seminars/

 

 

 

 

--

Almudena Conde Angulo

Project Manager

Condensed Matter Physics Center (IFIMAC)

Universidad Autónoma de Madrid

Phone: +34 914972433

e-mail: ifimac@uam.es 

 

 

 

 

 

 

06/04/2018 - 06/04/2018Dynamical strategies for resource sharing in microbes

Presentación a cargo de Jordi Garcia-Ojalvo Universitat Pompeu Fabra

 

 

Abstract:  

Living systems are usually faced with situations in which they have to share a common pool of limited resources. A standard way of solving this problem is by partitioning statically the resources among all players. In this talk I will discuss an alternative solution that relies on taking turns in time when utilizing the available resources. I will describe results that show, using a combination of time-lapse microscopy, microfluidics, and mathematical modeling, how bacteria use this time-sharing strategy at the levels of molecules, cells, and cellular populations.

 

 

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

 

 

 

21/03/2018 - 21/03/2018Spatial Positioning of Innate Controls B Cell Immunity to Infection

Ponente: Mauro Gaya (Ragon Institute of MGH, MIT and Harvard)

08/02/2018 - 08/02/2018Large deviations and quantum non-equilibrium

 

Abstract:  

 

I will review recent developments in applying dynamical large deviations

(LD) to quantum systems.  I will consider in particular open quantum

systems - quantum systems interacting with an environment - which in

many cases can be described in terms of quantum Markovian dynamics.  LD

methods provide a "thermodynamic" framework for understanding the

statistical properties of dynamics, revealing the existence of dynamical

phases and phase transitions, often associated to intermittent emission

patterns.  Problems of interest include interacting atomic ensembles,

quantum glasses, and systems where there is an interplay between

coherent transport and dissipation.  I will describe concepts relating

to quantum trajectory ensemble equivalence, prediction and

"retrodiction", matrix product states, and quantum Doob transforms. Time

permitting, I will also discuss the connection to ideas about slow

quantum relaxation and metastability.

 

 

 

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

 

 

 

 

 

 

Destacados

No existen eventos destacados en esta categoría

Generales

Total 100 eventos
Agenda de eventos
FechaEvento
27/04/2018 - 27/04/2018Building cortical networks from molecules to function

Ponente: Beatriz Rico

MRC Centre for Neurodevelopmental Disorders, King´s Collegue London, london, UK

19/04/2018 - 19/04/2018Valence Fluctuations and Unusual Correlations in Superconducting Pb1 xTlxTe

Abstract:  

The narrow-band semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable low-density metals, but only when it is doped with valence-skipping elements. There is strong experimental evidence that upon hole-doping PbTe with Tl the onset of superconductivity occurs as the chemical potential is tuned to a point of degeneracy of the Tl 1+ and 3+ valences. At these compositions the Tl dopants can dynamically skip valence by filling and emptying their 6s shell of two electrons simultaneously, naturally raising the question of whether Tl dopants can act as a negative U center to produce the enhanced superconductivity seen in this compound.

 

Here we present a study of the quantum oscillations, electrical transport and specific heat of hole-doped PbTe in which we use a series of non-superconducting, non-valence skipping Na doped samples as a control system for the Tl doped series described above. We identify the presence of an unusual 2e resonant impurity state that is unique to the superconducting portion of the Tl series, and appears to be enhancing, or even introducing, the pairing interaction in this material. This realization of a pairing interaction that is introduced extrinsically to a host material could guide the design of improved superconducting materials.

 

cid:11516B45-23FD-4C4E-8D2F-D1F4A0DFC39D

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

 

Dear all:

 

A new IFIMAC Conference will  take place on Thursday; April 19th at the  Condensed Matter Physics Center (IFIMAC )

You will find all the information below.

 

WHEN: Thursday; April 19th (2018); 12.00 h

WHERE: Dpto. Física de la Materia Condensada, Facultad Ciencias, Module 3, Seminar Room (5th Floor)

 

SPEAKER: Phil Walmsley (Stanford University)

 

TITLE: Valence Fluctuations and Unusual Correlations in  Superconducting Pb1-xTlxTe

 

ABSTRACT:

The narrow-band semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable low-density metals, but only when it is doped with valence-skipping elements. There is strong experimental evidence that upon hole-doping PbTe with Tl the onset of superconductivity occurs as the chemical potential is tuned to a point of degeneracy of the Tl 1+ and 3+ valences. At these compositions the Tl dopants can dynamically skip valence by filling and emptying their 6s shell of two electrons simultaneously, naturally raising the question of whether Tl dopants can act as a negative U center to produce the enhanced superconductivity seen in this compound.

 

Here we present a study of the quantum oscillations, electrical transport and specific heat of hole-doped PbTe in which we use a series of non-superconducting, non-valence skipping Na doped samples as a control system for the Tl doped series described above. We identify the presence of an unusual 2e resonant impurity state that is unique to the superconducting portion of the Tl series, and appears to be enhancing, or even introducing, the pairing interaction in this material. This realization of a pairing interaction that is introduced extrinsically to a host material could guide the design of improved superconducting materials.

 

More information: http://www.ifimac.uam.es/category/seminars/

 

 

 

 

--

Almudena Conde Angulo

Project Manager

Condensed Matter Physics Center (IFIMAC)

Universidad Autónoma de Madrid

Phone: +34 914972433

e-mail: ifimac@uam.es 

 

 

 

 

 

 

06/04/2018 - 06/04/2018Dynamical strategies for resource sharing in microbes

Presentación a cargo de Jordi Garcia-Ojalvo Universitat Pompeu Fabra

 

 

Abstract:  

Living systems are usually faced with situations in which they have to share a common pool of limited resources. A standard way of solving this problem is by partitioning statically the resources among all players. In this talk I will discuss an alternative solution that relies on taking turns in time when utilizing the available resources. I will describe results that show, using a combination of time-lapse microscopy, microfluidics, and mathematical modeling, how bacteria use this time-sharing strategy at the levels of molecules, cells, and cellular populations.

 

 

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

 

 

 

21/03/2018 - 21/03/2018Spatial Positioning of Innate Controls B Cell Immunity to Infection

Ponente: Mauro Gaya (Ragon Institute of MGH, MIT and Harvard)

08/02/2018 - 08/02/2018Large deviations and quantum non-equilibrium

 

Abstract:  

 

I will review recent developments in applying dynamical large deviations

(LD) to quantum systems.  I will consider in particular open quantum

systems - quantum systems interacting with an environment - which in

many cases can be described in terms of quantum Markovian dynamics.  LD

methods provide a "thermodynamic" framework for understanding the

statistical properties of dynamics, revealing the existence of dynamical

phases and phase transitions, often associated to intermittent emission

patterns.  Problems of interest include interacting atomic ensembles,

quantum glasses, and systems where there is an interplay between

coherent transport and dissipation.  I will describe concepts relating

to quantum trajectory ensemble equivalence, prediction and

"retrodiction", matrix product states, and quantum Doob transforms. Time

permitting, I will also discuss the connection to ideas about slow

quantum relaxation and metastability.

 

 

 

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

 

 

 

 

 

 

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Estudios

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Acto de entrega de la Medalla de la UAM a Fernando Reinoso y José M. Sanz
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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