t                                                                                       


Antonio M. García-García
Staff Member 
Cavendish Laboratory
EPSRC Career Acceleration Fellow
Invited Professor, CFIF, IST, Lisboa
t
t
t
                                                                                                                            
 RESUME
TOP PAPERS
LECTURES
TALKS
PUBLICATIONS
TEACHING

RESEARCH
PEOPLE
SUPER, SMALL, HOLOGRAPHIC, OUT OF EQUILIBRIUM
GRADUATE STUDENTS


I am theoretical physicist with a broad spectrum of research interests that include far from equilibrium dynamic, mesoscopic physics and nanoscience, superconductivity and holographic dualities. One of my main current research goals is to understand how to design enhanced and novel forms of superconductivity, at and out of equilibrium, in engineered superconducting interfaces, heterostructures and nano-structured materials My research group composed by two PhD students and two postdocs is supported by three grants: EPSRC Career Acceleration Fellowship (2011-2017) and Fundação para a Ciência de Portugal (2011-2014) and a Marie Curie International Reintegration Grant (2010-2014).

SUPERCONDUCTIVITY BY DESIGN
 NOVEL FORMS OF  SUPERCONDUCTIVITY
Recent technological advances in both growth and measurement of nano/hetero structures  have put the basis to study quantitatively nanoscale superconductivity. One particular area of interest is the identification of materialsphysical mechanisms and geometrical arrangements which lead to an enhancement of superconductivity in the nanoscale. Examples of current interest include copper oxides heterostructures, LAO/STO interfaces and granular conventional superconductors. Together with James Mayoh and Aurelio Bermudez, I have recently proposed a novel method  to engineer more robust superconductivity by controlled nano-granularity and also investigated the role of the substrate in the enhancement of superconductivity in thin films.
The ground state of all forms of superconductivity is a superposition of dimers, either spin-singlet or spin-triplet, which for sufficiently low temperature condensate. However the Efimov effect, that predicts the existence of bound states of three distinguishable particles even in the limit of no bound states for two particles, suggests the possibility of a richer phenomenology. I am studying, together with Pascal Naidon in Riken and Shimpei Endo in Paris, the role of Efimov physics in novel forms of superconductivity and its potential role to enhance superconductivity. Topologically non trivial quantum matter also offers a promising arena to discover non-conventional superconductors.  We have recently studied the Josephson supercurrent in a topological  superconductor.


t
copa

It is now possible to control and measure the size and shape of a superconducting nanograin.  This paves the way for a quantitative understanding of nanoscale superconductivity. Figure from Nature Materials, 9, 550 (2010). It is possible to substantially enhance the critical temperature of bulk superconductors  by granular nanoengineering.  Figure from arxv:1311.0295 for grain size ~5nm and, from top to bottom,  FCC, BCC and cubic packings.


HOLOGRAPHY & CONDENSED MATTER
 OUT OF EQUILIBRIUM DYNAMIC & THERMALIZATION
The AdS/CFT correspondence, also referred to as the holographic principle, is arguably he most important theoretical development in high energy physics of the last decade. It conjectures that certain strongly coupled field theories are dual of weakly coupled gravity theories in a different dimension. The application of the holographic duality in condensed matter systems is rapidly emerging as a forefront research field. Problems of special interests are those in which some sort of universality is expected. Together with Hong Liu and P. Chesler, I have recently reported novel aspects of the physics of out of equilibrium defect generation by holography techniques and scaling ideas.

The conditions leading to thermalization in a closed system after a quatum quench is being intensively investigated in recent years. I am interested on the role of spatial inhomogeneities and topological fluctuations (vortices and phase slips) in this process.  In two dimension this is closely related to the physics of the Kosterlitz Thouless transition out of equilibrium. I have recently investigated this problem by studying  the dynamic resulting from a quench in the spatial dimensionality of a strongly correlated system.

t
Time evolution of the order parameter of a two dimensional holographic superlfuid, from arxiv:14071862, as it is cooled from the disordered to the ordered phase.  According to the Kibble-Zurek mechnanism the number vortices, generated at tfreeze, scale with the quench speed. We have found that only at a later time teq vortices are formed and that the scaling with the quench speed breaks down for sufficiently fast quenches.





Photo
                                  Aurelio
t
Aurelio Bermúdez
James Mayoh

POSTDOCS

pos2 t
Hai-Qing Zhang
Pedro Ribeiro
COLLABORATORS

kl
san
a
jiao
Klaus Kern
Stuttgart
Sangita Bose
Bombay
Miguel Cazalilla
Tsinghua Taipei
Wang Jiao
Xiamen
emi masa
t
die
Emilio Cuevas
Murcia
Masaki Tezuka
Kyoto
Marcos Rigol
Pennsylvania
Diego Rodriguez
Oviedo

yu
a
t
t 
Emil Yuzbashyan
Rutgers
Boris Altshuler
Columbia
Pedro Sacramento
Lisbon
Ehsan Khatami
Georgetown

r
t
t
t
Klaus Richter
Regensburg
Juan Urbina
Regensburg
Pascal Naidon
Riken, Saitama
Armando Relaño        Madrid

jv
osb
nis
t
Jac Verbaarschot
Stony Brook
James Osborn
Argonne
Shinsuke Nishigaki Shimane, Matsue

Jorge Hirsch
UAM, Mexico DF

t
t santos
benson
Sebastian Franco
Durham
Ivan Brihuega
UAM, Madrid
Jorge Santos
Stanford
Benson Way
Cambridge




t
t


Paul Chesler
Harvard

Hong Liu
MIT

Paul Matthews
Imperial College
Shimpei Endo
Paris


                                                  PAST GROUP MEMBERS

Paul Matthews, Now PhD student at Imperial College, London.
Hua Bi Zeng, Now Prof. Bohai University, China.




LISTS