# Events Archive

## Condensed Matter Seminar

### Condensed Matter Seminar, Pablo Jarillo-Herrero, MIT, "Dirac Electrons — Living on the Edge"

Mon, Apr 13, 2015, 1:15 pm to 2:30 pm

Over the past decade, the physics of low dimensional electronic systems has been revolutionized by the discovery of materials with very unusual electronic properties where the behavior of the electrons is governed by the Dirac equation.

### Special Condensed Matter Seminar - Chunhui Du, Ohio State U - " Spin Dynamics and Transport Studied by Ferromagnetic Resonance (FMR) based Techniques"

Fri, Apr 10, 2015, 1:00 pm to 2:00 pm

Generation and manipulation of spin is of central importance in modern physics. This intense interest is driven in part by exciting new phenomena such as spin Hall effects and spin transfer torque as well as by the growth in new tools enabling microscopic studies.

### Special Condensed Matter Seminar - Abhinav Kandala, Penn State U. - "Engineering dissipation-less transport in magnetic topological insulator systems"

Thu, Apr 9, 2015, 1:00 pm to 2:00 pm

The mass domain wall of a 2D Dirac system has been long predicted to carry a chiral 1D mode. More recently, magnetic perturbations to the Dirac surface states of 3D topological insulators have created a practical route for the experimental realization of such 1D dissipation-less modes, and created a rich playground for a host of other exotic...

### Condensed Matter Seminar, Allan MacDonald, UT, Austin, "Exciton Condensates are Super!"

Mon, Apr 6, 2015, 1:15 pm to 2:30 pm

Electronic systems can have a type of order in which coherence is spontaneously established between two distinct groups of electrons. So far this (particle-hole or exciton condensate) type of order has been found only in double-layer two-dimensional electron gas systems, and only in certain strong magnetic field limits.

### Special Condensed Matter Seminar - T. Kontos, LPA, Ecole Normale Supérieure-"Coherent coupling of a single spin to microwave cavity photons"

Mon, Mar 30, 2015, 11:00 am to 12:00 pm

Electron spins and photons are complementary quantum mechanical objects which can be used to carry, manipulate and transform quantum information. Combining them into a scalable architecture is an outstanding challenge. In this context, the coherent coupling of a single spin to photons stored in a superconducting resonator is an important...

### Spec. Condensed Matter, SuYang Xu, PU & LBNL, "2D Topological Superconductors based on 3D Topological Insulators with Helical Pairing"

Thu, Feb 26, 2015, 1:30 pm to 2:30 pm

Research on topological insulators and Dirac materials have opened the door to search for related topological states of quantum matter. Superconductivity involving topological Dirac electrons has recently been proposed as a platform between concepts in high-energy and condensed-matter physics.

### Condensed Matter Seminar, N. Peter Armitage, Johns Hopkins,"Shining (low frequency) light on quantum magnets: Ising spin chains, quantum spin ice, an

Mon, Feb 23, 2015, 1:15 pm to 2:30 pm

Although typically we regard optical spectroscopies as probes of electronic degrees of freedom in materials, light's time-varying magnetic field allows one to couple to magnetic degrees of freedom. This talk will review recent advances in the area of time-domain THz spectroscopy and its application to “quantum" magnets.

### Spec. Condensed Matter Seminar, SuYang Xu, PU & LBNL, "TBA"

Fri, Feb 13, 2015, 2:00 pm to 3:00 pm

TBA

### Spec. Condensed Matter Seminar, SuYang Xu, PU & LBNL, "TBA"

Thu, Feb 12, 2015, 2:00 pm to 3:00 pm

TBA

### Condensed Matter Seminar, Dmitry Abanin, Perimeter Institute, "Many-body localization in periodically driven systems"

Mon, Feb 9, 2015, 1:15 pm to 2:30 pm

Periodic driving of quantum systems provides a natural experimental tool for probing and modifying their properties. In particular, periodic driving has been recently used to realize topologically non-trivial band structures in optical lattices. Yet, theoretically relatively little is known about the general properties of driven interacting...

### Condensed Matter Seminar, Andrey Chubukov, U of Minn, "Charge order in the cuprates"

Mon, Feb 2, 2015, 1:15 pm to 2:15 pm

I analyze charge order in hole-doped cuprates. I argue that magnetically-mediated interaction, which is known to give rise to d-wave superconductivity, also gives rise to charge-density-wave instabilities with momenta Q_x =(Q,0) and Q_y =(0,Q), as seen in the experiments.

### Condensed Matter Seminar, Carlos Sa De Melo, Georgia Tech,"Effects of spin-orbit coupling on the Berezinskii-Kosterlitz-Thouless transition . . . .

Wed, Jan 28, 2015, 2:00 pm to 3:30 pm

### Special Condensed Matter Seminar, Donna Sheng, Cal State U., "Chiral spin liquid and quantum phase diagram for extended Kagome Heisenberg model”

Wed, Dec 10, 2014, 1:30 pm to 2:30 pm

The kagome spin-1/2 model with dominant nearest neighboring (J1) antiferromagnetic coupling

### Condensed Matter Seminar, Nicolas Regnault, Princeton University,"Matrix Product States and the Fractional Quantum Hall Effect"

Mon, Dec 8, 2014, 1:15 pm to 2:30 pm

: The understanding and simulation of quantum many-body states in one space dimension has experienced revolutionary progress with the advent of the density matrix renormalization group. In modern language, this method can be viewed as a variational optimization over the set of matrix product states (MPS).

### Condensed Matter Seminar, James Analytis, Berkeley, "Magnetoresistance near a quantum critical point?

Mon, Dec 1, 2014, 1:15 pm to 2:30 pm

The physics of quantum critical phase transitions connects to some of the most difficult problems in condensed matter physics, including metal-insulator transitions, frustrated magnetism and high temperature superconductivity.

### Condensed Matter Seminar, Cheng Chin, U of Chicago,“Ferromagnetic domains and roton excitations in a dilute Bose superfluid”

Mon, Nov 24, 2014, 1:15 pm to 2:30 pm

We present a new scheme to engineer the energy-momentum dispersion of atoms in optical lattices. By hybridizing bands, we identify a novel quantum phase transition from the emergence of superfluid domains with ferromagnetic interactions.

### Special Condensed Matter Seminar, Adolpho Grushin, Max Planck,"Stability of Chern and Fractional Chern insulators"

Wed, Nov 19, 2014, 2:00 pm to 3:00 pm

Chern insulators (CI) and fractional Chern insulators (FCI) are zero field lattice analogues of the integer and fractional quantum Hall effects respectively. In this talk we will address the important problem of when and how they are induced by interactions.

### Condensed Matter Seminar, Anatoli Polkovnikov, Boston U., "Emergent non-adiabatic dynamics and geometric response in interacting systems"

Mon, Nov 17, 2014, 1:15 pm to 2:30 pm

I will overview relations between the non-adiabatic response and the geometric tensor. In particular, I will show how the Berry curvature (imaginary part of the geometric tensor) and the topological phase transitions can be engineered and measured using non-adiabatic response and discuss recent experiments in superconducting qubits.

### Special Condensed Matter Seminar, Debaleena Nandi, Caltech, "Signatures of bulk exciton transport in Coulomb drag and tunneling"

Thu, Nov 13, 2014, 11:00 am to 12:00 pm

Bose-Einstein condensation of excitons is realized in a quantum Hall bilayer at vT=1 when the total electron density in the two quantum wells matches the degeneracy of a single spin split Landau level.

### Special Condensed Matter Seminar, Barry Bradlyn, Yale, "Viscous and Thermal Transport in Topological Phases"

Tue, Nov 11, 2014, 2:00 pm to 3:00 pm

One hallmark of topological phases with broken time reversal symmetry is the appearance of quantized non-dissipative transport coefficients, the archetypical example being the quantized Hall conductivity in quantum Hall states.