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Topological phases in graphene

Zlatko Papic University of Leeds

February 10, 2014

PIRSA:14020134
Challenges 2

January 30, 2014

PIRSA:14010116
Quantum Fields and Strings

Robert Myers Perimeter Institute for Theoretical Physics

January 30, 2014

PIRSA:14010114
Particle Physics: Expanding Our Perimeter
- Natalia Toro Stanford University
- Philip Schuster Stanford University
January 30, 2014

PIRSA:14010113
Constructing Quantum Space Time

Bianca Dittrich Perimeter Institute for Theoretical Physics

January 30, 2014

PIRSA:14010112
What’s Happening in Cosmology?
- Kendrick Smith Perimeter Institute for Theoretical Physics
- Latham Boyle University of Edinburgh
January 30, 2014

PIRSA:14010111
Challenges 1

January 30, 2014

PIRSA:14010115
Experimental Metaphysics

Robert Spekkens Perimeter Institute for Theoretical Physics

January 30, 2014

PIRSA:14010110
What A Quantumful World

Hector Bombin PsiQuantum Corp.

January 30, 2014

PIRSA:14010109
Emergence and Entanglement: A New World of Condensed Matter Physics

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

January 30, 2014

PIRSA:14010108
Calculating the free energy of antimicrobial peptide (HHC-36) dimerization in bulk

shaqa vafa University of Guelph

December 05, 2013

PIRSA:13120043
Ab initio insight in supercooled water

John Tatini Titantah Western University

December 05, 2013

PIRSA:13120042

Topological phases in graphene

Zlatko Papic University of Leeds

February 10, 2014

PIRSA:14020134

As realized for the first time in 1980s, quantum many-body systems in reduced spatial dimensions can sometimes undergo a special type of ordering which does not break any symmetry but introduces long-range entanglement and emergent excitations that have radically different properties from their original constituents. Most of our experimental knowledge of such ``topological" phases of matter comes from studies of two-dimensional electron gases in GaAs semiconductors in high magnetic fields and at low temperatures. In the first part of this talk, I will give an introduction to these systems and review some latest theoretical developments related to their entanglement properties. In the second part, I will discuss new possibilities
for experimental realizations of topological phases in bilayer graphene. I will present evidence that this material supports an ``even-denominator" fractional state, related to the Moore-Read state, whose observation has recently been reported. Finally, I will outline several proposals based on the tunability of the electron-electron interactions in bilayer graphene which might enable further experimental progress beyond GaAs.
Challenges 2

January 30, 2014

PIRSA:14010116
Quantum Fields and Strings

Robert Myers Perimeter Institute for Theoretical Physics

January 30, 2014

PIRSA:14010114
Particle Physics: Expanding Our Perimeter
- Natalia Toro Stanford University
- Philip Schuster Stanford University
January 30, 2014

PIRSA:14010113
Constructing Quantum Space Time

Bianca Dittrich Perimeter Institute for Theoretical Physics

January 30, 2014

PIRSA:14010112
What’s Happening in Cosmology?
- Kendrick Smith Perimeter Institute for Theoretical Physics
- Latham Boyle University of Edinburgh
January 30, 2014

PIRSA:14010111
Challenges 1

January 30, 2014

PIRSA:14010115
Experimental Metaphysics

Robert Spekkens Perimeter Institute for Theoretical Physics

January 30, 2014

PIRSA:14010110
What A Quantumful World

Hector Bombin PsiQuantum Corp.

January 30, 2014

PIRSA:14010109
Emergence and Entanglement: A New World of Condensed Matter Physics

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

January 30, 2014

PIRSA:14010108
Calculating the free energy of antimicrobial peptide (HHC-36) dimerization in bulk

shaqa vafa University of Guelph

December 05, 2013

PIRSA:13120043

The increasing demand for antibiotics has contributed to the investigation of possible novel antibiotics by many researchers. For this purpose experimental and theoretical studies have been carried out to draw scientists' attention to antimicrobial peptides and their interaction with the surface of bacterial membranes. Their ability to disrupt the functioning of bacterial membranes has been probed from different perspectives. The most desirable antimicrobial peptides are those which do not harm plant or animals' membranes but which disrupt bacterial membranes. It has been found that some cationic antimicrobial peptides (CAPs) satisfy these requirements. CAPs interacting with the outer membrane of gram-negative bacteria and the membrane of gram-positive bacteria have been studied recently.We conduct a Molecular Dynamics simulation study of peptide-peptide interactions in physiological solutions and investigate the mechanism of CAPs aggregation since aggregation of the peptides could precede their interaction with the membrane. Different algorithms are applied to calculate the potential mean force of the aggregation process of peptides to select the most efficient one. Also we have run CD spectroscopy and calorimetry experiments to predict the structure of the peptide and measure the peptide-peptide binding enthalpy and compared these results with our simulation data. The particular CAP studied is HHC-36 a peptide selected by high throughput screening (A. Cherkasov et al ACS Chem. Biol. 2009 4 (1) pp 6574) (M. Kazemzadeh-Narbat et al Biomed. Mater. Res. Part B 2012 5 pp1344-1352) (M. Ma et al Biomed. Mater. Res. Part A 2012 2 pp278-185) which has nine amino acid residues and charge +5.
Ab initio insight in supercooled water

John Tatini Titantah Western University

December 05, 2013

PIRSA:13120042

As an extension to previous ab initio studies on water [12] we present 400 psBorn-Oppenheimer ab initio Molecular dynamics study on water at deep supercooled temperatures (down to 220 K) and confirm a crossover from a fragile to strongliquid around the Widom line. This crossover is accompanied by the passage from relatively weaker hydrogen bonds in the dominantly high density liquid (HDL) at high temperatures to strong hydrogen bond in dominantly low density liquid (LDL). This crossover is accompanied by a maximum in the excess specific heat at constant volume and may lend further support to the existence of a liquid-liquid critical point (LLCP) in supercooled water as was predicted by Peter Poole and collaborators using ST2 water model[3].References[1] J. T. Titantah and M. Karttunen Long-Time Correlations and Hydrophobe-Modified Hydrogen-Bonding Dynamics in Hydrophobic Hydration. J. Am. Chem. Soc. 134 9362 (2012)[2] J. T. Titantah and M. Karttunen Water dynamics: Relation between hydrogen bond bifurcations molecular jumps local density & hydrophobicity. Sci. Rep. 3 2991 (2013)[3] Poole P. H. Sciortino F. Essmann U. & Stanley H. E. Phase behaviour of metastable water. Nature 360 324328 (1992)

Title	Speaker(s)	Date	Talk Type	Info link
Topological phases in graphene	Zlatko Papic	2014-02-10	Conference	View details
Challenges 2		2014-01-30	Conference	View details
Quantum Fields and Strings	Robert Myers	2014-01-30	Conference	View details
Particle Physics: Expanding Our Perimeter	Natalia Toro, Philip Schuster	2014-01-30	Conference	View details
Constructing Quantum Space Time	Bianca Dittrich	2014-01-30	Conference	View details
What’s Happening in Cosmology?	Kendrick Smith, Latham Boyle	2014-01-30	Conference	View details
Challenges 1		2014-01-30	Conference	View details
Experimental Metaphysics	Robert Spekkens	2014-01-30	Conference	View details
What A Quantumful World	Hector Bombin	2014-01-30	Conference	View details
Emergence and Entanglement: A New World of Condensed Matter Physics	Xiao-Gang Wen	2014-01-30	Conference	View details
Calculating the free energy of antimicrobial peptide (HHC-36) dimerization in bulk	shaqa vafa	2013-12-05	Conference	View details
Ab initio insight in supercooled water	John Tatini Titantah	2013-12-05	Conference	View details

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