Spin-Charge-Lattice Coupling through Multi-Magnon Excitations in Multiferroic BiFeO3 (2008)
Ramirez, M. O., Kumar, A., Denev, S. A., Chu, Y. H., Seidel, J., Martin, L., ...
Spin-charge-lattice coupling mediated by multi-magnon processes is demonstrated in multiferroic BiFeO3. Raman, linear and non linear optical spectroscopies show up to six resonant enhancements of the...
Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3 (2007)
Ramirez, Mariola O., Krishnamurthi, M., Denev, S., Kumar, A., Yang, Seung-Yeul, Chu, Ying-Hao, ...
A prominent band centered at around 1000-1300 cm-1 and associated with resonant enhancement of two-phonon Raman scattering is reported in multiferroic BiFeO3 thin films and single crystals. A strong...
Non-diffusive spin dynamics in a two-dimensional electron gas (2006)
Weber, C. P., Orenstein, J., Bernevig, B. Andrei, Zhang, Shou-Cheng, Stephens, Jason, Awschalom, D. D.
We describe measurements of spin dynamics in the two-dimensional electron gas in GaAs/GaAlAs quantum wells. Optical techniques, including transient spin-grating spectroscopy, are used to probe the...
An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System (2006)
Bernevig, B. Andrei, Orenstein, J., Zhang, Shou-Cheng
Spin-orbit coupled systems generally break the spin rotation symmetry. However, for a model with equal Rashba and Dresselhauss coupling constant (the ReD model), and for the $[110]$ Dresselhauss...
Observation of spin Coulomb drag in a two-dimensional electron gas (2005)
Weber, C. P., Gedik, N., Moore, J. E., Orenstein, J., Stephens, Jason, Awschalom, D. D.
An electron propagating through a solid carries spin angular momentum in addition to its mass and charge. Of late there has been considerable interest in developing electronic devices based on the...
Gedik, N., Langner, M., Orenstein, J., Ono, S., Abe, Yasushi, Ando, Yoichi
We report time-resolved measurements of the photoinduced change in reflectivity, DeltaR, in the Bi2Sr2Ca1-yDyyCu2O8+delta (BSCCO) system of cuprate superconductors as a function of hole...
Gedik, N., Orenstein, J., Ono, S., Abe, Yasushi, Ando, Yoichi
We report time-resolved measurements of the photoinduced change in reflectivity, Delta R, in the Bi2Sr2Ca(1-y)Dy(y)Cu2O(8+delta) (BSCCO) system of cuprate superconductors as a function of hole...
Cooper pair formation dynamics in Bi2Sr2CaCu2O8+delta (2003)
Kaindl, R.A., Carnahan, M.A., Orenstein, J., Chemla, D.S., Oh, S., Eckstein, J.N.
We utilize ultrafast terahertz pulses to monitor the carrier dynamics in the high-TC superconductor Bi2Sr2CaCu2O8+delta. The temperature, density and timedependence distinctly exposes a bimolecular...
Diffusion of Nonequilibrium Quasiparticles in a Cuprate Superconductor (2003)
Gedik, N., Orenstein, J., Liang, Ruixing, Bonn, D. A., Hardy, W. N.
We report a transport study of nonequilibrium quasiparticles in a high-Tc cuprate superconductor using the transient grating technique. Low-intensity laser excitation (at photon energy 1.5 eV) was...
Single-quasiparticle stability and quasiparticle-pair decay in YBa2Cu3O6.5 (Ortho II) (2003)
Gedik, N., Blake, P., Spitzer, R. C., Orenstein, J., Liang, Ruixing, Bonn, D. A., ...
We report results and analysis of time-resolved photoinduced reflectivity experiments on the cuprate superconductor YBa2Cu3O6.5. The sample, which has Tc=45 K, was characterized by a high degree of...
Nonequilibrium THz Conductivity of Bi2Sr2CaCu2O8+d (2003)
Carnahan, M.A., Kaindl, R.A., Orenstein, J., Chemla, D.S., Oh, S., Eckstein, J.N.
Using high sensitivity visible-pump/THz-probe spectroscopy we investigate the dynamics of the complex optical conductivity in optimally-doped Bi2Sr2CaCu2O8+d films directly after photoexcitation. The...
Photoinduced Changes of Reflectivity in Single Crystals of YBa2Cu3O6.5 (Ortho II) (2001)
Segre, G. P., Gedik, N., Orenstein, J., Bonn, D. A., Liang, Ruixing, Hardy, W. N.
We report measurements of the photoinduced change in reflectivity of an untwinned single crystal of YBa2Cu3O6.5 in the ortho II structure. The decay rate of the transient change in reflectivity is...
Far-infrared optical conductivity gap in superconducting MgB2 films (2001)
Kaindl, R. A., Carnahan, M. A., Orenstein, J., Chemla, D. S., Christen, H. M., Zhai, H., ...
We report the first study of the optical conductivity of MgB2 covering the range of its superconducting energy gap. Terahertz time-domain spectroscopy is utilized to determine the complex,...
Fractional power-law conductivity in SrRuO_3 and its consequences (2000)
Dodge, J. S., Weber, C. P., Corson, J., Orenstein, J., Schlesinger, Z., Reiner, J. W., ...
We combine the results of terahertz time-domain spectroscopy with far-infrared transmission and reflectivity to obtain the conductivity of SrRuO_3 over an unprecedented continuous range in frequency,...
Measurement of Transport Lifetime in a Cuprate Superconductor (2000)
Corson, J., Orenstein, J., Oh, Seongshik, O'Donnel, J., Eckstein, J. N.
We report measurements of the phase of the conductivity, $\phi_\sigma\equiv arg(\sigma)$, in the normal state of a $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}$ (BSCCO) thin film from 0.2-1.0 THz. From...
Nodal Quasiparticle Lifetime in the Superconducting State of BSCCO(2212) (2000)
Corson, J., Orenstein, J., Oh, Seongshik, O'Donnell, J., Eckstein, J. N.
We have measured the complex conductivity of a BSCCO(2212) thin film between 0.2 and 1.0 THz. We find the conductivity in the superconducting state to be well described as the sum of contributions...
Low Temperature AC Conductivity in BSCCO (2212) (1999)
Corson, J., Mallozzi, R., Orenstein, J., Eckstein, J. N., Bozovic, I.
We report measurements of anamolously large dissipative conductivities in BiSrCaCuO(2212) at low temperatures. We have measured the complex conductivity of BSCCO thin films at 100-600 GHz as a...
Vanishing of phase coherence in underdoped Bi_2Sr_2CaCu_2O_8+d (1998)
Corson, J., Mallozzi, R., Orenstein, J., Eckstein, J. N., Bozovic, I.
Coherent time-domain spectroscopy is used to measure the screening and dissipation of high-frequency electromagnetic fields in a set of underdoped Bi_2Sr_2CaCu_2O_8+d thin films. The measurements...
PHOTO INDUCED INFRARED ACTIVE PHONONS IN TRANS POLYACETYLENE (1983)
Vardeny, Z., Orenstein, J., Baker, G.
We measured photogenerated ir active phonons in trans-(CH)x by the photoinduced absorption technique. A correlation was found to exist with a photoinduced absorption band in which electronic...
PHOTOGENERATED GAP STATES IN POLYACETYLENE (1983)
Orenstein, J., Baker, G., Vardeny, Z.
We have measured the optical absorption spectrum of photogenerated gap states in polyacetylene, (CH)x. From a comparison with electroabsorption spectra the charge state of the excitations is...
PHOTO INDUCED INFRARED ACTIVE PHONONS IN TRANS POLYACETYLENE (1983)
Vardeny, Z., Orenstein, J., Baker, G.
We measured photogenerated ir active phonons in trans-(CH)x by the photoinduced absorption technique. A correlation was found to exist with a photoinduced absorption band in which electronic...
PHOTOGENERATED GAP STATES IN POLYACETYLENE (1983)
Orenstein, J., Baker, G., Vardeny, Z.
We have measured the optical absorption spectrum of photogenerated gap states in polyacetylene, (CH)x. From a comparison with electroabsorption spectra the charge state of the excitations is...
PHOTO INDUCED INFRARED ACTIVE PHONONS IN TRANS POLYACETYLENE (1983)
Vardeny, Z., Orenstein, J., Baker, G.
We measured photogenerated ir active phonons in trans-(CH)x by the photoinduced absorption technique. A correlation was found to exist with a photoinduced absorption band in which electronic...
PHOTOGENERATED GAP STATES IN POLYACETYLENE (1983)
Orenstein, J., Baker, G., Vardeny, Z.
We have measured the optical absorption spectrum of photogenerated gap states in polyacetylene, (CH)x. From a comparison with electroabsorption spectra the charge state of the excitations is...
DENSITY OF STATES IN THE GAP OF a-As2Se3 BY PHOTOCURRENT TRANSIENT SPECTROSCOPY (1981)
Monroe, D., Orenstein, J., Kastner, M.
Dispersive photocurrent in a-As2Se3, for T>200K, provides a measure of the density of localized states near the mobility edge. The power law transients correspond to a density of states which is...
DENSITY OF STATES IN THE GAP OF a-As2Se3 BY PHOTOCURRENT TRANSIENT SPECTROSCOPY (1981)
Monroe, D., Orenstein, J., Kastner, M.
Dispersive photocurrent in a-As2Se3, for T>200K, provides a measure of the density of localized states near the mobility edge. The power law transients correspond to a density of states which is...
DENSITY OF STATES IN THE GAP OF a-As2Se3 BY PHOTOCURRENT TRANSIENT SPECTROSCOPY (1981)
Monroe, D., Orenstein, J., Kastner, M.
Dispersive photocurrent in a-As2Se3, for T>200K, provides a measure of the density of localized states near the mobility edge. The power law transients correspond to a density of states which is...
Human immunodeficiency virus 1 envelope-initiated G2-phase programmed cell death.
Kolesnitchenko, V, Wahl, L M, Tian, H, Sunila, I, Tani, Y, Hartmann, D P, ...
Despite intensive investigation, no clearly defined mechanism explaining human immunodeficiency virus (HIV)-induced cell killing has emerged. HIV-1 infection is initiated through a high-affinity...
Rapid induction of apoptosis by cell-to-cell transmission of human immunodeficiency virus type 1.
Maldarelli, F, Sato, H, Berthold, E, Orenstein, J, Martin, M A
The kinetics of human immunodeficiency virus type 1 (HIV-1)-induced cell death were investigated in cell-to-cell and cell-free models of virus transmission. Cocultivation of HIV-1 chronically...
Westervelt, P, Henkel, T, Trowbridge, D B, Orenstein, J, Heuser, J, Gendelman, H E, ...
The regulation of human immunodeficiency virus type 1 infection and replication in primary monocytes was investigated by mutagenesis of recombinant proviral clones containing an env determinant...
Eilbott, D J, Peress, N, Burger, H, LaNeve, D, Orenstein, J, Gendelman, H E, ...
Spinal cord disease is common in patients infected with human immunodeficiency virus type 1 (HIV-1), and a characteristic vacuolar myelopathy is present at autopsy in approximately one-fourth of...
Association of Ribosomes with Intracellular Vesicular Stomatitis Virus Particles
Orenstein, J., Shelton, E., Lazzarini, R. A.
Ribosomes are observed intimately associated with nucleocapsids of vesicular, stomatitis virus, especially those that line structures that are either cytoplasmic vesicles or invaginations of the...
Huang, L M, Joshi, A, Willey, R, Orenstein, J, Jeang, K T
Thirteen genetically altered HIV-1 proviruses were created. These various genomes can be segregated into three groups: (i) a set of tat(-) viruses that have a functional HTLV-I Tax inserted in nef;...
Human immunodeficiency virus 1 envelope-initiated G2-phase programmed cell death.
Kolesnitchenko, V, Wahl, L M, Tian, H, Sunila, I, Tani, Y, Hartmann, D P, ...
Despite intensive investigation, no clearly defined mechanism explaining human immunodeficiency virus (HIV)-induced cell killing has emerged. HIV-1 infection is initiated through a high-affinity...
Rapid induction of apoptosis by cell-to-cell transmission of human immunodeficiency virus type 1.
Maldarelli, F, Sato, H, Berthold, E, Orenstein, J, Martin, M A
The kinetics of human immunodeficiency virus type 1 (HIV-1)-induced cell death were investigated in cell-to-cell and cell-free models of virus transmission. Cocultivation of HIV-1 chronically...
Westervelt, P, Henkel, T, Trowbridge, D B, Orenstein, J, Heuser, J, Gendelman, H E, ...
The regulation of human immunodeficiency virus type 1 infection and replication in primary monocytes was investigated by mutagenesis of recombinant proviral clones containing an env determinant...
Eilbott, D J, Peress, N, Burger, H, LaNeve, D, Orenstein, J, Gendelman, H E, ...
Spinal cord disease is common in patients infected with human immunodeficiency virus type 1 (HIV-1), and a characteristic vacuolar myelopathy is present at autopsy in approximately one-fourth of...
Association of Ribosomes with Intracellular Vesicular Stomatitis Virus Particles
Orenstein, J., Shelton, E., Lazzarini, R. A.
Ribosomes are observed intimately associated with nucleocapsids of vesicular, stomatitis virus, especially those that line structures that are either cytoplasmic vesicles or invaginations of the...
Huang, L M, Joshi, A, Willey, R, Orenstein, J, Jeang, K T
Thirteen genetically altered HIV-1 proviruses were created. These various genomes can be segregated into three groups: (i) a set of tat(-) viruses that have a functional HTLV-I Tax inserted in nef;...