Fecha  Evento 

27/04/2018  27/04/2018  Building cortical networks from molecules to function Ponente: Beatriz Rico MRC Centre for Neurodevelopmental Disorders, King´s Collegue London, london, UK 
19/04/2018  19/04/2018  Valence Fluctuations and Unusual Correlations in Superconducting Pb1 xTlxTe Abstract: The narrowband semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable lowdensity metals, but only when it is doped with valenceskipping elements. There is strong experimental evidence that upon holedoping 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 holedoped PbTe in which we use a series of nonsuperconducting, nonvalence 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.
Más información: http://www.ifimac.uam.es/category/seminars/
Dear all:
A new IFIMAC Conference will take place on Thursday; April 19^{th} at the Condensed Matter Physics Center (IFIMAC ) You will find all the information below.
WHEN: Thursday; April 19^{th} (2018); 12.00 h WHERE: Dpto. Física de la Materia Condensada, Facultad Ciencias, Module 3, Seminar Room (5^{th} Floor)
SPEAKER: Phil Walmsley (Stanford University)
TITLE: Valence Fluctuations and Unusual Correlations in Superconducting Pb1xTlxTe
ABSTRACT: The narrowband semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable lowdensity metals, but only when it is doped with valenceskipping elements. There is strong experimental evidence that upon holedoping 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 holedoped PbTe in which we use a series of nonsuperconducting, nonvalence 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 email: ifimac@uam.es

06/04/2018  06/04/2018  Dynamical strategies for resource sharing in microbes Presentación a cargo de Jordi GarciaOjalvo 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 timelapse microscopy, microfluidics, and mathematical modeling, how bacteria use this timesharing strategy at the levels of molecules, cells, and cellular populations.
Más información: http://www.ifimac.uam.es/category/conferencesevents

21/03/2018  21/03/2018  Spatial Positioning of Innate Controls B Cell Immunity to Infection Ponente: Mauro Gaya (Ragon Institute of MGH, MIT and Harvard) 
08/02/2018  08/02/2018  Large deviations and quantum nonequilibrium
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/

Fecha  Evento 

27/04/2018  27/04/2018  Building cortical networks from molecules to function Ponente: Beatriz Rico MRC Centre for Neurodevelopmental Disorders, King´s Collegue London, london, UK 
19/04/2018  19/04/2018  Valence Fluctuations and Unusual Correlations in Superconducting Pb1 xTlxTe Abstract: The narrowband semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable lowdensity metals, but only when it is doped with valenceskipping elements. There is strong experimental evidence that upon holedoping 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 holedoped PbTe in which we use a series of nonsuperconducting, nonvalence 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.
Más información: http://www.ifimac.uam.es/category/seminars/
Dear all:
A new IFIMAC Conference will take place on Thursday; April 19^{th} at the Condensed Matter Physics Center (IFIMAC ) You will find all the information below.
WHEN: Thursday; April 19^{th} (2018); 12.00 h WHERE: Dpto. Física de la Materia Condensada, Facultad Ciencias, Module 3, Seminar Room (5^{th} Floor)
SPEAKER: Phil Walmsley (Stanford University)
TITLE: Valence Fluctuations and Unusual Correlations in Superconducting Pb1xTlxTe
ABSTRACT: The narrowband semiconductor PbTe superconducts with a Tc an order of magnitude greater than comparable lowdensity metals, but only when it is doped with valenceskipping elements. There is strong experimental evidence that upon holedoping 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 holedoped PbTe in which we use a series of nonsuperconducting, nonvalence 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 email: ifimac@uam.es

06/04/2018  06/04/2018  Dynamical strategies for resource sharing in microbes Presentación a cargo de Jordi GarciaOjalvo 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 timelapse microscopy, microfluidics, and mathematical modeling, how bacteria use this timesharing strategy at the levels of molecules, cells, and cellular populations.
Más información: http://www.ifimac.uam.es/category/conferencesevents

21/03/2018  21/03/2018  Spatial Positioning of Innate Controls B Cell Immunity to Infection Ponente: Mauro Gaya (Ragon Institute of MGH, MIT and Harvard) 
08/02/2018  08/02/2018  Large deviations and quantum nonequilibrium
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/
