Showing 2012 · cond-mat.mes-hallShow all

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cond-mat.mes-hall2012★ 1.8k cited

Hofstadter's butterfly in moire superlattices: A fractal quantum Hall effect

C. R. Dean, L. Wang, P. Maher +12

Electrons moving through a spatially periodic lattice potential develop a quantized energy spectrum consisting of discrete Bloch bands. In two dimensions, electrons moving through…

cond-mat.mes-hall2012★ 1 cited

Evidence of inter-layer interaction in magneto-luminescence spectra of electron bilayers

Ilirjan Aliaj, Vittorio Pellegrini, Andrea Gamucci +4

Magneto-luminescence studies in electron bilayers reveal the hallmarks of the even-denominator and other quantum Hall states in the intensities and energies of the inter-band optic…

cond-mat.mes-hall2012★ 168 cited

Evidence for a Spin Phase Transition at ν=0 in Bilayer Graphene

Patrick Maher, Cory R. Dean, Andrea F. Young +5

The most celebrated property of the quantum spin Hall effect is the presence of spin-polarized counter-propagating edge states. This novel edge state configuration has also been pr…

cond-mat.mes-hall2012★ 78 cited

Quantitative Current-Voltage Characteristics in Molecular Junctions from First Principles

Pierre Darancet, Jonathan R. Widawsky, Hyoung Joon Choi +2

Using self-energy-corrected density functional theory (DFT) and a coherent scattering-state approach, we explain current-voltage (IV) measurements of four pyridine-Au and amine-Au…

cond-mat.mes-hall2012★ 79 cited

Quantum Dots at Room Temperature carved out from Few-Layer Graphene

Amelia Barreiro, Herre S. J. van der Zant, Lieven M. K. Vandersypen

We present graphene quantum dots endowed with addition energies as large as 1.6 eV, fabricated by the controlled rupture of a graphene sheet subjected to a large electron current i…

cond-mat.mes-hall2012★ 19 cited

Entropy density and entropy flux in near-field thermal radiation

Arvind Narayanaswamy, Yi Zheng

We propose a method to evaluate the entropy density and entropy flux in a vacuum gap between two half-spaces that takes into account influence of near-field effects, i.e., interfer…

cond-mat.mes-hall2012★ 122 cited

Layer breathing modes in few-layer graphene

Chun Hung Lui, Tony F. Heinz

Layer-layer coupling plays a critical role in defining the physical properties of few-layer graphene (FLG). With respect to vibrations, the interlayer coupling is predicted to crea…

cond-mat.mes-hall2012★ 5 cited

Effects of the interfacial polarization on tunneling in surface coupled quantum dots

Kuljit S. Virk, David R. Reichman, Mark S. Hybertsen

Polarization effects are included exactly in a model for a quantum dot in close proximity to a planar interface. Efficient incorporation of this potential into the Schrödinger equa…

cond-mat.mes-hall2012★ 32 cited

Transport properties of individual C60-molecules

G. Géranton, C. Seiler, A. Bagrets +2

Electrical and thermal transport properties of C60 molecules are investigated with density-functional-theory based calculations. These calculations suggest that the optimum contact…

cond-mat.mes-hall2012★ 4.1k cited

Control of valley polarization in monolayer MoS2 by optical helicity

Kin Fai Mak, Keliang He, Jie Shan +1

Electronic and spintronic devices rely on the fact that free charge carriers in solids carry electric charge and spin, respectively. There are, however, other properties of charge…

cond-mat.mes-hall2012★ 24 cited

Spin-polarized electric currents in diluted magnetic semiconductor heterostructures induced by terahertz and microwave radiation

P. Olbrich, C. Zoth, P. Lutz +11

We report on the study of spin-polarized electric currents in diluted magnetic semiconductor (DMS) quantum wells subjected to an in-plane external magnetic field and illuminated by…

cond-mat.mes-hall2012★ 182 cited

Observation of out-of-plane vibrations in few-layer graphene

Chun Hung Lui, Leandro M. Malard, SukHyun Kim +4

We report the observation of layer breathing mode (LBM) vibrations in few-layer graphene (FLG) samples of thickness from 2 to 6 layers, exhibiting both Bernal (AB) and rhombohedral…

cond-mat.mes-hall2012★ 26 cited

Terahertz detection mechanism and contact capacitance of individual metallic single-walled carbon nanotubes

Joel D. Chudow, Daniel F. Santavicca, Chris B. McKitterick +2

We characterize the terahertz detection mechanism in antenna-coupled metallic single-walled carbon nanotubes. At low temperature, 4.2 K, a peak in the low-frequency differential re…

cond-mat.mes-hall2012★ 102 cited

Radiative coupling and weak lasing of exciton-polariton condensates

I. L. Aleiner, B. L. Altshuler, Y. G. Rubo

In spite of having finite life-time exciton-polaritons in microcavities are known to condense at strong enough pumping of the reservoir. We present an analytical theory of such Bos…

cond-mat.mes-hall2012★ 92 cited

Magnetoresistance measurements of Graphene at the Charge Neutrality Point

Yue Zhao, Paul Cadden-Zimansky, Fereshte Ghahari +1

We report on transport measurements of the insulating state that forms at the charge neutrality point of graphene in a magnetic field. Using both conventional two-terminal measurem…

cond-mat.mes-hall2012★ 398 cited

Spin and valley quantum Hall ferromagnetism in graphene

Andrea F. Young, Cory R. Dean, Lei Wang +7

In a graphene Landau level (LL), strong Coulomb interactions and the fourfold spin/valley degeneracy lead to an approximate SU(4) isospin symmetry. At partial filling, exchange int…

cond-mat.mes-hall2012★ 290 cited

Simultaneous Determination of Conductance and Thermopower of Single Molecule Junctions

J. R. Widawsky, P. Darancet, J. B. Neaton +1

We report the first concurrent determination of conductance (G) and thermopower (S) of single-molecule junctions via direct measurement of electrical and thermoelectric currents us…