Paper thru
UNDER CONSTRUCTION
Updated on 07/30/2012
S. G. Bhongale, L. Mathey, Shan-Wen Tsai, Charles W. Clark and Erhai Zhao, Bond Order Solid of Two-Dimensional Dipolar Fermions, Physical Review Letters 108, 145301 (2012).
Predrag Nikolić, An effective theory of fractional topological insulators in two spatial dimensions, unpublished (2012). arXiv:1206.1055
Chester P. Rubbo, Indubala I. Satija, William P. Reinhardt, Radha Balakrishnan, Ana Maria Rey and Salvatore R. Manmana, Quantum Dynamics of Solitons in Strongly Interacting Systems on Optical Lattices, to be published in Physical Review A (2012)
Indubala I. Satija and Erhai Zhao, Topological insulators with ultracold atoms, Conference proceeding for cdamop2011 (Current development in atomic, molecular and optical physics), New Delhi, India, to be published as a book chapter in Springer Verlag series (2012). arXiv:1201.1458
Kai He, Indubala I. Satija, Charles Clark, Ana Maria Rey and Marcos Rigol, Noise Correlation Scalings: Revisiting the Quantum Phase Transitions in Incommensurate Lattices with Hard-Core Bosons, Physical Review A 85, 013617 (2012).
M. W. Malone and K. L. Sauer, Homonuclear Dipolar Coupling and CPMG Spin-Echoes in NQR, to be published in Applied Magnetic Resonance (2012).
Xiao-Yu Chen, Ping Yu, Li-Zhen Jiang and Mingzhen Tian, Genuine Entanglement of Four Qubit Cluster Diagonal States, unpublished (2012). arXiv:1204.5512
Xiao-Yu Chen, Li-Zhen Jiang, Ping Yu and Mingzhen Tian, Total and genuine entanglement of three qubit GHZ diagonal …
Quantum over brunch is an informal journal club series in the Physics Department at George Mason University. We meet once or twice a month to discuss topics of current research interest in the general field of condensed matter physics. This is a branch of physics which seeks to understand quantum mechanics of macroscopically many interacting particles.
The meetings are organized by the faculty of the condensed matter theory group at GMU, Predrag Nikolic, Erhai Zhao and Indu Satija. We welcome all graduate students at GMU interested in quantum physics. Our goal is to create a forum in which we can have conversations about the hottest current research topics, and both stimulate and satify our curiosity about the unexplained phenomena in quantum physics.
The format for this club is somewhat open: it will not be seminar style, but a discussion session. We will start every topic at a very basic level. By asking questions, we all hope to learn the subject. We believe that students interested in quantum physics will set the stage for the level of discussion. Since our plan is to learn each topic in full detail and depth, we will read and discuss scientific paper and our sessions will tend to be …
Posted on 11/30/2009
Stephen Keeling volunteered to give us a short overview of what we learned so far. Then, Erhai Zhao gave a gentle overview of the topological insulators and superconductors found in papers:
• Andreas P. Schnyder, Shinsei Ryu, Akira Furusaki, Andreas W. W. Ludwig;
Phys. Rev. B 78, 195125 (2008) and arXiv:0905.2029, AIP Conf. Proc. 1134, 10 (2009)
• Alexei Kitaev, “Periodic table for topological insulators and superconductors”, arXiv:0901.2686
The interest for these subjects is motivated by possible applications in quantum computing.
NOVEMBER20
Posted on 11/30/2009
Dr. Kai Sun from the Joint Quantum Institute (JQI) at the University of Maryland gave a technical but very educational overview of topological insulators. We learned how to characterize topological properties, how topological protection works, and much more (Power Point presentation). Dr. Sun is an expert on quantum liquid crystals and topological phases. He got his PhD from the University of Illinois at Urbana-Champaign in 2009 working with Edurado Fradkin. His papers can be found here.
NOVEMBER13
Posted on 11/16/2009
We discussed the first real topological insulator (invariant under time-reversal) which was proposed to occur and later found to exist in CdTe/HgTe quantum wells. Parag Ghosh led the discussion of the Science article by B. Andrei Bernevig et.al. A …
1
Posted on 02/19/2010
Science and Technology I, Room 306, 9am-11am
Indu and Parag will open the discussion on topological Anderson insulators. The relevant papers are: • Topological Anderson Insulator,
• Theory of the Topological Anderson Insulator,
• Numerical study of the topological Anderson insulator in HgTe/CdTe quantum wells.
FEBRUARY15
Posted on 02/04/2010
We had brief reports by Erhai and Predrag on the freshest research developments communicated at the“Exotic Insulating States of Matter” conference which took place at Johns Hopkins University in January 2010.
Then, Mahmoud presented the new developments in topologically protected insulators with a few papers highlighting the superconductor properties gained by doping Bi2Se3 with Cu. We looked at the material structure, the resistivity and magnetization dependence on temperature, and STM images of a sample.
We focused on the results in this paper:
• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator,
but also mentioned the following papers:
• Observation of unconventional band topology in a superconducting doped topological insulator, Cu(x)Bi2Se3: Topological Superconductor or non-Abelian superconductor?
• Odd-Parity Topological Superconductors: Theory and Application to Cu(x)Bi2Se3$
Posted on 11/22/2010
Science and Technology I, Room 306, 11am (+ lunch after noon)
QOB visitor informal talk
Dr. Adrian Del Maestro, Institute for Quantum Matter at Johns Hopkins University
Quantum Monte Carlo Studies of Luttinger Liquids
We employ worm algorithm path integral quantum Monte Carlo methods to study one dimensional, strongly interacting bosonic systems at finite temperature in the continuum. An analysis of the resulting numerical data indicates corrections to the scaling predictions of the usual harmonic Luttinger Liquid theory that can be understood by extending the field theory to include formally irrelevant operators.
NOVEMBER5
Posted on 11/04/2010
Science and Technology I, Room 306, 11am (+ lunch after noon)
QOB visitor informal talk
Prof. Radha Balakrishnan, Institute of Mathematical Sciences, India
A brief introduction to solitons and integrability
OCTOBER8
Posted on 10/07/2010
Science and Technology I, Room 306, 11am (+ lunch after noon)
Mahmoud Lababidi graceously volunteered to discuss his work on the Josephson effect on a Topological Insulator Surface. Some reading material: Beenakker and Maiti, Sengupta.
OCTOBER1
Posted on 09/29/2010
Science and Technology I, Room 306, 11am (+ lunch after noon)
QOB visitor informal talk
Dr. Noah Bray-Ali, NIST
Holographic Entanglement Spectrum
Topological insulators and topological superconductors are characterized by dimensional reduction: their low energy, compressible excitations live on the boundary. This holography …
Announcement:
We invite you to join us for informal lectures, presented by one of our physics faculty or an outside guest scientist, engaged in research in frontiers of quantum physics. These stimulating discussion style lectures will be followed by happy hour where we will continue our conversation on various current topics in quantum physics. We encourage our graduate and advanced undergraduates, particularly those interested in Quantum Physics, to participate and contribute to the excitement.
SEPTEMBER23
Young’s double slit setup, introduced about two hundred years ago, is one of the most versatile tools to demonstrate the interference phenomena for both the light and the matter waves in physics. In contrast to this amplitude interferometry, there is also an intensity interferometry, discovered by Hanbury Brown and Twiss (HBT) about half a century ago, where correlations of signal intensities, rather than amplitudes was used to measure the angular sizes of astronomical objects. Instead of the two slits, the intensity interferometry involves two detectors and measures the probability of simultaneous arrival of particles in the detectors. In view of the strange unclassical character of the identical particles, this detection …
Posted on 04/27/2011
Science and Technology I, Room 306, 11am (+ lunch after noon)
QOB informal talk
Dr. Satyan Bhongale, GMU
Fermionic dipolar molecules on a square lattice
Recent trapped atom experiments are able to generate an ultra-cold gas of heteronuclear molecules with a sufficiently large dipole moment to allow for the occurrence of rich many-body physics leading to exotic quantum phases. A key role is played by the anisotropic and long range nature of the dipole-dipole interaction. We study the system of fermionic dipolar molecules in a 2D optical lattice. Previous studies for homogeneous configurations have revealed the possibility of s-wave CDW and the p-wave BCS phase. In our study we take an unbiased approach by following the functional RG technique. This method allows us to look at the flow of various channels as one approaches the Fermi surface in the RG sense. We find an intriguing interplay between the s-wave CDW and the p-wave superfluid phases.
APRIL15
Posted on 04/12/2011
Science and Technology I, Room 306, 11am (+ lunch after noon)
QOB informal talk
Dr. Bin Wang, University of Maryland
Time-Evolving-Block-Decimation Studies on Ultracold Atoms in 1D Optical Lattices
Time-Evolving-Block-Decimation (TEBD) algorithm is a powerful tool for the study of ground state and dynamical properties of …
Announcement:
We invite you to join us for informal lectures, presented by one of our physics faculty or an outside guest scientist, engaged in research in frontiers of quantum physics. These stimulating discussion style lectures will be followed by happy hour where we will continue our conversation on various current topics in quantum physics. We encourage our graduate and advanced undergraduates, particularly those interested in Quantum Physics, to participate and contribute to the excitement.
DECEMBER8
Posted on 12/06/2011
Science and Technology I, Room 306, 4:30pm
QOB informal talk
Dr. Krishnamurthy Vemuru, GMU
X-ray magnetic circular dichroism spectroscopy of ferromagnetic materials
NOVEMBER4
Posted on 11/02/2011
Science and Technology I, Room 306, 11am (+ lunch after noon)
QOB informal talk
Prof. Ana Maria Rey, JILA
Quantum Magnetism with Ultra Cold Polar Molecules
OCTOBER14
Posted on 10/12/2011
Science and Technology I, Room 306, 11am (+ lunch after noon)
QOB “journal club”
Indu will discuss non-equilibrium topological states based on her preliminary work using kicked 2D lattices in magnetic fields. Related papers are:
Topological characterization of periodically driven quantum systems
Floquet topological insulator in semiconductor quantum wells
OCTOBER5
Posted on 10/03/2011
Science and Technology I, Room 306, 4pm
QOB informal talk
Prof. Shmuel Fishman, Technion University, Israel
Hyper-transport in potentials that are random in space and time
SEPTEMBER16
Additional questions and feedback on the Center for Quantum Science site can be addressed to: