D. M. Newns

IBM Research - Thomas J. Watson Research Center

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Pratap Pattnaik

IBM (United States)

J.P. Muscat

University of Lausanne

C. C. Tsuei

IBM Research - Thomas J. Watson Research Center

R. Brako

Rudjer Boskovic Institute

Tony F. Heinz

Stanford University

James A. Misewich

Brookhaven National Laboratory

Phaedon Avouris

IBM Research - Thomas J. Watson Research Center

C. C.

IBM Research - Thomas J. Watson Research Center

C. L. Kane

University of Pennsylvania

A. C. Hewson

Imperial College London

Cooperative Institutions

IBM Research - Thomas J. Watson Research Center

IBM (United States)

Imperial College London

University of Regensburg

Argonne National Laboratory

University of Oxford

Columbia University

Centre National de la Recherche Scientifique

University of Pennsylvania

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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Theory of a Tm impurity in metals in a jj-coupling model

Journal of Physics C Solid State Physics (1986)

N. Read Keya Dharamvir J. W. Rasul D. M. Newns

A Tm magnetic impurity with U= infinity is considered in the jj-coupling scheme in the limit of zero j.j coupling. The model has SU(N) symmetry. The spin-fluctuation energy scale is found in the f12 and f13 Kondo limits via Haldane scaling arguments. The model possesses a 1/N expansion; selecting the leading-N diagrams in perturbation theory, the Yafet-Varma integral equation is derived. This is solved analytically in the f1 and f2 Kondo limits and the results for N to infinity are found to be in accord with scaling theory. The energy separation between the singlet ground state and the N-fold-degenerate excited state is found as a function of f occupation in the large-N limit. The results are found to differ significantly with data on LaTmSe and YTmSe. A model with large j.j coupling is also considered and does not significantly improve the agreement.

Anderson impurity model

10.1088/0022-3719/19/10/014

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Citations (43)

Surface Reactions Activated by High Electron Temperatures

Springer series in solid-state sciences (1996)

Tony F. Heinz James A. Misewich D. M. Newns M. Bandbyge Per Hedegård

Femtosecond pulse

10.1007/978-3-642-61185-8_17

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Giant Piezoresistive On/Off Ratios in Rare-Earth Chalcogenide Thin Films Enabling Nanomechanical Switching

Nano Letters (2013)

M. Copel Marcelo A. Kuroda Michael S. Gordon X.-H. Liu Smita Mahajan

Sophisticated microelectromechanical systems for device and sensor applications have flourished in the past decade. These devices exploit piezoelectric, capacitive, and piezoresistive effects, and coupling between them. However, high-performance piezoresistivity (as defined by on/off ratio) has primarily been observed in macroscopic single crystals. In this Letter, we show for the first time that rare-earth monochalcogenides in thin film form can modulate a current by more than 1000 times due to a pressure-induced insulator to metal transition. Furthermore, films as thin as 8 nm show a piezoresistive response. The combination of high performance and scalability make these promising candidates for nanoscale applications, such as the recently proposed piezoelectronic transistor (PET). The PET would mechanically couple a piezoelectric thin film with a piezoresistive switching layer, potentially scaling to higher speeds and lower powers than today's complementary metal-oxide-semiconductor technology.

Piezoresistive effect

10.1021/nl401710f

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Citations (36)

Desorption Induced by Femtosecond Laser Pulses: Surface Dynamics at High Electronic Temperatures

Springer series in surface sciences (1993)

Tony F. Heinz James A. Misewich M. M. T. Loy D. M. Newns H. Zacharias

Soft laser desorption

Dynamics

10.1007/978-3-642-78080-6_7

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Citations (1)

Spin-spin correlations in the tt'-Hubbard model

Journal de Physique I (1995)

Thomas Husslein D. M. Newns Hans-Georg Mattutis Pratap Pattnaik I. Morgenstern

We present calculations of the tt'-Hubbard model using Quantum Monte Carlo techniques. The parameters are chosen so that the van Hove Singularity in the density of states and the Fermi level coincide. We study the behaviour of the system with increasing Hubbard interaction U. Special emphasis is on the spin-spin correlation (SSC). Unusual behaviour for large U is observed there and in the momentum distribution function ( n(q)).

t-J model

10.1051/jp1:1995136

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Citations (1)

Possible role of the alkaline-earth ions in high-temperature superconductivity

Physical review. B, Condensed matter (1989)

Maria Ronay D. M. Newns

In high-temperature superconductors with ${T}_{c}$ exceeding the temperature of liquid nitrogen, there is no conventional isotope shift. This suggests an unconventional pairing mechanism, but we notice a systematic upward "polarizability shift" in ${T}_{c}$. The shift in ${T}_{c}$ of about 20% occurs in the 1:2:3, 2:2:1:2, and 2:2:2:3 high-temperature superconducting compounds when the more polarizable Ba replaces Sr. A semiquantitative calculation enables us to interpret our result in the framework of the two-hole resonance mechanism. The role of the alkaline-earth ion is to partially screen the electron-electron Coulomb repulsion $U$, lowering the energy of the ${d}^{8}$ state and hence increasing ${T}_{c}$.

Alkaline earth metal

Liquid nitrogen

Superconducting transition temperature

BCS theory

10.1103/physrevb.39.819

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Theory of high-Tcsuperconductors within a realistic Anderson lattice model

Physical review. B, Condensed matter (1988)

D. M. Newns Pratap Pattnaik Mark Rasolt D. A. Papaconstantopoulos

A realistic Anderson lattice Hamiltonian for ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ is derived from an extensive tight-binding parametrization of ab initio band structure. A solution of the Hamiltonian by the $\frac{1}{N}$ expansion technique gives remarkably good agreement with the data on thermodynamic, transport, and critical properties, e.g., the location of the holes on the oxygen and saturation of ${T}_{c}$ at 15% doping are reproduced.

Hamiltonian (control theory)

Lattice (music)

Anderson impurity model

10.1103/physrevb.38.7033

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Citations (68)

Slowly varying time-dependent local perturbations in metals: a new approach

Journal of Physics C Solid State Physics (1981)

R. Brako D. M. Newns

When a local time-dependent perturbation in a metal is switched on and then off, it is desired to calculate the probability P( epsilon ) for the system to be excited to a state of energy h(cross) epsilon . For a strong but slow perturbation V(t) the authors show that the problem reduces to the calculation of an evolution operator for a time-independent one-body potential W(V(t)) which is a functional of V(t). They calculate W for potentials possessing a time-independent phase-shift representation. For such potentials they calculate the evolution operator, and hence P( epsilon ), for a Fermi sea both at zero and finite temperature. They give simple applications of their results to problems such as X-ray photoemission spectroscopy and energy dissipation of an atom scattered from a metal surface. The relationship to a recent solution of the problem, at zero temperature, using a time-dependent Tomonagon representation is indicated.

Operator (biology)

Time evolution

10.1088/0022-3719/14/21/023

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Citations (58)

Plasmon excitations of free and adsorbed thin metallic films

Physics Letters A (1972)

D. M. Newns

Dispersion relation

10.1016/0375-9601(72)91019-5

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Citations (53)