Quantum Matter

Quantum matter physics is the branch of physics that studies systems of very large numbers of particles in a condensed state, like solids or liquids. Quantum matter physics wants to answer questions like: why is a material magnetic? Or why is it insulating or conducting? Or new, exciting questions like: what materials are good to make a reliable quantum computer? Can we describe gravity as the behavior of a material? The behavior of a system with many particles is very different from that of its individual particles. We say that the laws of many body physics are emergent or collective. Emergence explains the beauty of physics laws.

Displaying 1105 - 1116 of 1222

Condensed Matter 101 - Lecture 3

Denis Dalidovich
August 29, 2012

PIRSA:12080034
Condensed Matter
Condensed Matter 101 - Lecture 2

Denis Dalidovich
August 28, 2012

PIRSA:12080033
Condensed Matter
Condensed Matter 101 - Lecture 1

Denis Dalidovich
August 27, 2012

PIRSA:12080032
Condensed Matter
Glass: The Cinderella Problem of Condensed Matter Physics

Anthony Leggett University of Illinois Urbana-Champaign
August 03, 2012

PIRSA:12080001
Condensed Matter
Integer Quantum Hall Effect for Bosons: A Physical Realization

Senthil Todadri Massachusetts Institute of Technology (MIT) - Department of Physics
July 27, 2012

PIRSA:12070013
Condensed Matter
Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects

Ashvin Vishwanath Harvard University
July 27, 2012

PIRSA:12070012
Condensed Matter
Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem

Subir Sachdev Harvard University
July 11, 2012

PIRSA:12070009
Condensed Matter
Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice
June 15, 2012

PIRSA:12060072
Condensed Matter
Numerical Holographic Striped Phases
June 08, 2012

PIRSA:12060029
Condensed Matter
NMR and Frustrated Magnetism
June 03, 2012

PIRSA:12060036
Condensed Matter
Neutron Scattering Techniques for Frustrated Magnetism

Collin Broholm National Institute of Standards and Technology
June 03, 2012

PIRSA:12060035
Condensed Matter
Correlations, Fluctuations and Constraints: The Statistical Physics of Classical Models for Geometrically Frustrated Magnets

John Chalker University of Oxford
June 03, 2012

PIRSA:12060031
Condensed Matter

Condensed Matter 101 - Lecture 3

Denis Dalidovich
August 29, 2012

PIRSA:12080034
Condensed Matter
Condensed Matter 101 - Lecture 2

Denis Dalidovich
August 28, 2012

PIRSA:12080033
Condensed Matter
Condensed Matter 101 - Lecture 1

Denis Dalidovich
August 27, 2012

PIRSA:12080032
Condensed Matter
Glass: The Cinderella Problem of Condensed Matter Physics

Anthony Leggett University of Illinois Urbana-Champaign
August 03, 2012

PIRSA:12080001
Condensed Matter
Amorphous materials (glasses) probably constitute >90% of the solid matter surrounding us in everyday life,yet traditional textbooks of condensed matter physics devote virtually no space to them.Crudely speaking,the puzzles in the behavior of glasses can be divided into three major areas:the glass transition itself,the characteristic long-term memory effects and the near-equilibrium thermal,dielectric and transport properties;this talk focusses entirely on the third area.Over the last 40 years it has become apparent that the thermal and transport properties are not only qualitatively universal between glasses with totally different chemistry and microstructure,but in some cases possess a truly mind-boggling degree of _quantitative_ universality.In this talk I will describe the salient experimental data,review the established ("tunnelling two-level system") model commonly used to interpret them,and introduce a rather different scenario (developed in collaboration with D.C.Vural) which holds out some prospect of explaining the universalities in a natural way.
Integer Quantum Hall Effect for Bosons: A Physical Realization

Senthil Todadri Massachusetts Institute of Technology (MIT) - Department of Physics
July 27, 2012

PIRSA:12070013
Condensed Matter
A simple physical realization of an integer quantum Hall state of interacting two dimensional bosons is provided. This is an example of a "symmetry-protected topological" (SPT) phase which is a generalization of the concept of topological insulators to systems of interacting bosons or fermions. Universal physical properties of the boson integer quantum Hall state are described and shown to correspond to those expected from general classifications of SPT phases.
Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects

Ashvin Vishwanath Harvard University
July 27, 2012

PIRSA:12070012
Condensed Matter
I will briefly review topological phases of non interacting fermions, such as topological insulators, and discuss how ideas from quantum information, in particular the entanglement spectrum, can be used to characterize them. For topological phases protected by inversion symmetry I argue that this is the ideal tool, and discuss how it leads to a classification of 3D topological phases. Next, I will discuss topological phases that only appear in the presence of interactions, although they share essential characteristics with non-interacting topological phases. A general theory of such states of bosons in 2+1 dimensions will be given, and specific examples, the bosonic analogs of topological superconductors and insulators, will be discussed.
Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem

Subir Sachdev Harvard University
July 11, 2012

PIRSA:12070009
Condensed Matter
It has long been known that a metal near an instability to antiferromagnetism also has a weak-coupling Cooper instability to spin-singlet d-wave-like superconductivity. However, the theory of the antiferromagnetic quantum critical point flows to strong-coupling in two spatial dimensions, and so the fate of the superconductivity has also been unclear. I will describe a method to realize the generic antiferromagnetic quantum critical in a metal in a sign-problem-free Monte Carlo simulation. Results showing Fermi surface reconstruction and unconventional spin-singlet superconductivity across the critical point are obtained.
Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice
June 15, 2012

PIRSA:12060072
Condensed Matter
We discuss the thermodynamic properties of the model exchange quantum spin ice material Yb_2Ti_2O_7. Using exchange parameters recently determined from high-field neutron scattering measurements, we calculate the thermodynamic properties of this model system. We find very good agreement with the heat capacity, entropy and magnetization measurements on the materials. We show that, in the weak quantum regime, quantum fluctuations lead to the selection, within the spin-ice manifold, of a conventional ordered ground state. However, the excitations above the ground state and their dynamics remain highly non-trivial. They consist of weakly bound spinon-antispinon pairs separated by long strings. We present several pieces of indirect evidence that the low temperature phase transition observed in these materials is to this conventional ordered state.
Numerical Holographic Striped Phases
June 08, 2012

PIRSA:12060029
Condensed Matter
TBA
NMR and Frustrated Magnetism
June 03, 2012

PIRSA:12060036
Condensed Matter
Neutron Scattering Techniques for Frustrated Magnetism

Collin Broholm National Institute of Standards and Technology
June 03, 2012

PIRSA:12060035
Condensed Matter
Neutron scattering can provide unique atomic scale information about structural and dynamical properties of frustrated magnetism. In this lecture I will give a brief description of theoretical and practical aspects of the technique. Experiments on frustrated magnets that illustrate the capabilities of new instrumentation at the Spallation Neutron Source and NIST will serve as examples. The target audience is scientists who are interested in using neutrons in their research, collaborating with a neutron scattering group, or who seek a deeper understanding of the corresponding experimental
literature [1].

[1] See http://jins.tennessee.edu/course2012/ for information about an online graduate course to be offered in the fall of 2012 on the use of neutron scattering in quantum condensed matter physics.

*Work at IQM was supported by the US DoE, office of Basic Energy Sciences, Division of
Material Sciences and Engineering under DE-FG02-08ER46544.
Correlations, Fluctuations and Constraints: The Statistical Physics of Classical Models for Geometrically Frustrated Magnets

John Chalker University of Oxford
June 03, 2012

PIRSA:12060031
Condensed Matter
TBA

Title	Speaker(s)	Date	Talk Type	Info link
Condensed Matter 101 - Lecture 3	Denis Dalidovich	2012-08-29	Course	View details
Condensed Matter 101 - Lecture 2	Denis Dalidovich	2012-08-28	Course	View details
Condensed Matter 101 - Lecture 1	Denis Dalidovich	2012-08-27	Course	View details
Glass: The Cinderella Problem of Condensed Matter Physics	Anthony Leggett	2012-08-03	Scientific Series	View details
Integer Quantum Hall Effect for Bosons: A Physical Realization	Senthil Todadri	2012-07-27	Scientific Series	View details
Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects	Ashvin Vishwanath	2012-07-27	Scientific Series	View details
Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem	Subir Sachdev	2012-07-11	Scientific Series	View details
Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice		2012-06-15	Scientific Series	View details
Numerical Holographic Striped Phases		2012-06-08	Conference	View details
NMR and Frustrated Magnetism		2012-06-03	Conference	View details
Neutron Scattering Techniques for Frustrated Magnetism	Collin Broholm	2012-06-03	Conference	View details
Correlations, Fluctuations and Constraints: The Statistical Physics of Classical Models for Geometrically Frustrated Magnets	John Chalker	2012-06-03	Conference	View details

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Format results

Condensed Matter 101 - Lecture 3

Condensed Matter 101 - Lecture 2

Condensed Matter 101 - Lecture 1

Glass: The Cinderella Problem of Condensed Matter Physics

Integer Quantum Hall Effect for Bosons: A Physical Realization

Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects

Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem

Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice

Numerical Holographic Striped Phases

NMR and Frustrated Magnetism

Neutron Scattering Techniques for Frustrated Magnetism

Correlations, Fluctuations and Constraints: The Statistical Physics of Classical Models for Geometrically Frustrated Magnets