92 citations · 292 across the 14 of their papers we have counts for
14 papers
Anti-symmetric Chiral currents at zero magnetic field in some two-dimensional superconductors
Chandra M. Varma
Non-reciprocal critical currents without applying an external magnetic field have been observed recently in several superconductors, in various forms of Graphene, a Kagome compound…
Gyrotropic Birefringence in the Under-doped Cuprates
C. M. Varma
The optical effects due to the loop-current order parameter in under-doped cuprates are studied in order to understand the recent observation of unusual birefringence in electromag…
Higgs Bosons in D-wave Superconductors
Yafis Barlas, C. M. Varma
The concept of "broken symmetry", that the symmetry of the vacuum may be lower than the Hamiltonian of a quantum theory, plays an important role in modern physics. A manifestation…
Berry phase and Anomalous Hall Effect in a Three-orbital Tight-binding Hamiltonian
Yan He, Joel Moore, C. M. Varma
We consider the Anomalous Hall (AH) state induced by interactions in a three-orbital per unit-cell model. To be specific we consider a model appropriate for the Copper-Oxide lattic…
A variational method in the problem of screening an external charge in strongly correlated metals
G. G. Guzmán-Verri, Arkady Shekhter, C. M. Varma
We describe a variational calculation for the problem of screening of a point charge in a layered correlated metal for dopings close to the Mott transition where the screening is n…
Collective Modes in the Loop Ordered Phase of Cuprates
Yan He, C. M. Varma
We show that the two branches of collective modes discovered recently in under-doped Cuprates with huge spectral weight are a necessary consequence of the loop-current state. Such…
Topological Excitations near the Local Critical Point in the Dissipative 2D XY model
Vivek Aji, C. M. Varma
The dissipative XY model in two spatial dimensions belongs to a new universality class of quantum critical phenomena with the remarkable property of the decoupling of the critical…
A comprehensive study of electric, thermoelectric and thermal conductivities of Graphene with short range unitary and charged impurities
Vincent Ugarte, Vivek Aji, C. M. Varma
Motivated by the experimental measurement of electrical and hall conductivity, thermopower and Nernst effect, we calculate the longitudinal and transverse electrical and heat trans…
Violation of Onsager Reciprocity in Underdoped Cuprates ?
C. M. Varma, Victor M. Yakovenko, A. Kapitulnik
One of the canons of condensed matter physics is the Onsager Reciprocity principle in systems in which the Hamiltonian commutes with the time-reversal operator. Recent results of m…
Negative Thermal Expansion and Some Elastic properties of a Class of Solids
Yan He, Vladimir Cvetkovic, C. M. Varma
We consider the thermal expansion, change of sound velocity with pressure and temperature, and the Poisson ratio of lattices which have rigid units (polyhedra very large stiffness…
Theory of the Quantum Critical Fluctuations in Cuprates
Vivek aji, C. M. Varma
The statistical mechanics of the time-reversal and inversion symmetry breaking order parameter, possibly observed in the pseudogap region of the phase diagram of the Cuprates, can…
Topological Transition in the Fermi Surface of Cuprate Superconductors in the Pseudogap Regime
C. M. Varma, Lijun Zhu
The angle-resolved photoemission spectroscopy studies on cuprates in the pseudogap region reveal an extraordinary topological transition in which the ground state changes from one…
Josephson effect for superconductors lacking center of inversion
Brigitte Leridon, Tai-Kai Ng, C. M. Varma
Due to the absence of a center of inversion in some superconducting compounds, a p-wave admixture to the dominant d-wave order parameter must exist. If time-reversal is also violat…
Tilting instability and other anomalies in the flux-lattice in some magnetic superconductors
T. K. Ng, C. M. Varma
The flux-line lattice in the compound , which has a tendency to ferromagnetic order in the a-b plane is studied with external magnetic field direction close to the c-ax…