Presentation is loading. Please wait.

Presentation is loading. Please wait.

Ballistic conductance of suspended nanowires: An ab initio description

Published by Modified over 9 years ago

Similar presentations

Presentation on theme: "Ballistic conductance of suspended nanowires: An ab initio description"— Presentation transcript:

1 Ballistic conductance of suspended nanowires: An ab initio description
M. Czerner1, A. Bagrets1, N. Papanikolaou2, V.S. Stepanyuk3 and I. Mertig1 1Martin-Luther-Universität Halle, Germany 2Institute of Material Science, National Center for Scientific Research „Demokritos“, Athens, Greece 3 Max-Planck-Institute Mikrostrukturphysik Halle, Germany ADMOL Dresden,

2 Relaxation and conductance Impurity scattering
Content Motivation Method Parity oscillations Relaxation and conductance Impurity scattering Ballistic magnetoconductance Summary ADMOL Dresden,

3 H. Ohnishi, Yu. Kondo, K. Takayanagi, Nature 395, 780 (1998)
Motivation Metallic Nanowires Conductance H. Ohnishi, Yu. Kondo, K. Takayanagi, Nature 395, 780 (1998) KKR-Workshop München,

4 KKR Green‘s function method
Semi-infinite leads Suspended nanowire ADMOL Dresden,

5 Landauer theory with Green‘s functions
Landauer formula 1 Sample 2 Conductance Matrix elements H.U. Baranger and A.D. Stone, Phys. Rev. B 40, 8169 (1989) ADMOL Dresden,

6 Conductance of Cu wires
Local partial DOS at central Cu atom Cu fcc [100] Conductance histogram at T=4.2K for Cu, A. I. Yanson, PhD. Thesis, Leiden University, the Netherlands, 2001. G = 1.10 G0 ADMOL Dresden,

7 Conductance of Cu wires
Local partial DOS at central Cu atom Conductance histogram at T=4.2K for Cu, A. I. Yanson, PhD. Thesis, Leiden University, the Netherlands, 2001. G = 2.59 G0 Cu fcc [100] ADMOL Dresden,

8 Parity oscillation in the conductance of Cu wires
Experiment KKR calculation R.H.M. Smit et al., Phys. Rev. Lett. 91, (2003) M. Czerner, diploma thesis, MLU Halle (2003) ADMOL Dresden,

9 Even-odd parity effect in the density of states
s-LDOS p-LDOS ADMOL Dresden,

10 Stress and conductance in a Cu wire
Averaged stress Conductance Distance d (Å) a b c Average stress per Cu atom (ev/ų) V.S.Stepanyuk et al., Phys. Rev. B (2003) M. Czerner, diploma thesis, MLU Halle (2003) ADMOL Dresden,

11 Conductance through sp-atoms
sp impurity (Z = ) ADMOL Dresden,

12 Conductance through sp-atoms
sp impurity (Z = ) ADMOL Dresden,

13 Conductance through sp-atoms
sp impurity (Z = ) ADMOL Dresden,

14 Conductance through 3d transition metal atoms
3d impurity (Z = ) ADMOL Dresden,

15 Conductance through 3d transition metal atoms
3d impurity (Z = ) ADMOL Dresden,

16 Conductance through 3d transition metal atoms
3d impurity (Z = ) ADMOL Dresden,

17 Conductance through 3d transition metal atoms
3d impurity (Z = ) ADMOL Dresden,

18 Conductance through 3d transition metal atoms
ADMOL Dresden,

19 Conductance through 3d transition metal atoms
ADMOL Dresden,

20 Conductance through 3d transition metal atoms
ADMOL Dresden,

21 Conductance of Co wires
DOS Conductance ADMOL Dresden,

22 Ballistic Magnetoconductance
Parallel configuration (P) Antiparallel configuration (AP) MR =(gP – gAP)/gAP x 100% ADMOL Dresden,

23 Ballistic Magnetoconductance of Co wires
MR = 38 % MR = 29 % ADMOL Dresden,

24 Conductance depends strongly on geometry of the junction
Summary Conductance depends strongly on geometry of the junction II. Parity oscillations III. Relaxation enhances conductance III. Impurity scattering modulates conductance IV. Ballistic magnetoconductance is ~50 % ADMOL Dresden,

Download ppt "Ballistic conductance of suspended nanowires: An ab initio description"

Similar presentations

Scanning tunnelling spectroscopy

Scanning tunnelling spectroscopy
Ab Initio Calculations of Three and Four Body Dynamics M. Tomaselli a,b Th. Kühl a, D. Ursescu a a Gesellschaft für Schwerionenforschung, D-64291 Darmstadt,Germany.

Ab Initio Calculations of Three and Four Body Dynamics M. Tomaselli a,b Th. Kühl a, D. Ursescu a a Gesellschaft für Schwerionenforschung, D Darmstadt,Germany.
Deriving Insights from Computation: Molecular Electronics to Self-trapped Excitons Steven G. Louie Physics Department, UC Berkeley and MSD, LBNL Electron.

Deriving Insights from Computation: Molecular Electronics to Self-trapped Excitons Steven G. Louie Physics Department, UC Berkeley and MSD, LBNL Electron.
Quantum transport beyond the independent-electron approximation Rex Godby.

Quantum transport beyond the independent-electron approximation Rex Godby.
Quantum Monte Carlo Simulation of Vibrational Frequency Shifts in Pure and Doped Solid para-Hydrogen Lecheng Wang, Robert J. Le Roy and Pierre- Nicholas.

Quantum Monte Carlo Simulation of Vibrational Frequency Shifts in Pure and Doped Solid para-Hydrogen Lecheng Wang, Robert J. Le Roy and Pierre- Nicholas.
Topics in Condensed Matter Physics Lecture Course for graduate students CFIF/Dep. Física Spin-dependent transport theory Vitalii Dugaev Winter semester:

Topics in Condensed Matter Physics Lecture Course for graduate students CFIF/Dep. Física Spin-dependent transport theory Vitalii Dugaev Winter semester:
Dynamics of Vibrational Excitation in the C 60 - Single Molecule Transistor Aniruddha Chakraborty Department of Inorganic and Physical Chemistry Indian.

Dynamics of Vibrational Excitation in the C 60 - Single Molecule Transistor Aniruddha Chakraborty Department of Inorganic and Physical Chemistry Indian.
1 1.Introduction 2.Electronic properties of few-layer graphites with AB stacking 3.Electronic properties of few-layer graphites with AA and ABC stackings.

1 1.Introduction 2.Electronic properties of few-layer graphites with AB stacking 3.Electronic properties of few-layer graphites with AA and ABC stackings.
Stability and Symmetry Breaking in Metal Nanowires I: Toward a Theory of Metallic Nanocohesion Capri Spring School on Transport in Nanostructures, March.

Stability and Symmetry Breaking in Metal Nanowires I: Toward a Theory of Metallic Nanocohesion Capri Spring School on Transport in Nanostructures, March.
1 Nonequilibrium Green’s Function Approach to Thermal Transport in Nanostructures Jian-Sheng Wang National University of Singapore.

1 Nonequilibrium Green’s Function Approach to Thermal Transport in Nanostructures Jian-Sheng Wang National University of Singapore.
Stability analysis of metallic nanowires: Interplay of Rayleigh and Peierls Instabilities Daniel Urban and Hermann Grabertcond-mat/0307279 Jellium model:

Stability analysis of metallic nanowires: Interplay of Rayleigh and Peierls Instabilities Daniel Urban and Hermann Grabertcond-mat/ Jellium model:
Influence of gases on the formation of atomic gold wires By using a Mechanically Controlled Break Junction (MCBJ) at 4.2 K it is possible to form atomic.

Influence of gases on the formation of atomic gold wires By using a Mechanically Controlled Break Junction (MCBJ) at 4.2 K it is possible to form atomic.
SpiDME meeting, Nijmegen, May 2007 Stefano Sanvito and Nadjib Baadji Computational Spintronics Group School of Physics and CRANN, Trinity College.

SpiDME meeting, Nijmegen, May 2007 Stefano Sanvito and Nadjib Baadji Computational Spintronics Group School of Physics and CRANN, Trinity College.
Mesoscopic Anisotropic Magnetoconductance Fluctuations in Ferromagnets Shaffique Adam Cornell University PiTP/Les Houches Summer School on Quantum Magnetism,

Mesoscopic Anisotropic Magnetoconductance Fluctuations in Ferromagnets Shaffique Adam Cornell University PiTP/Les Houches Summer School on Quantum Magnetism,
The noise spectra of mesoscopic structures Eitan Rothstein With Amnon Aharony and Ora Entin 02.02.09 Condensed matter seminar, BGU.

The noise spectra of mesoscopic structures Eitan Rothstein With Amnon Aharony and Ora Entin Condensed matter seminar, BGU.
Solid state realisation of Werner quantum states via Kondo spins Ross McKenzie Sam Young Cho Reference: S.Y. Cho and R.H.M, Phys. Rev. A 73, 012109 (2006)

Solid state realisation of Werner quantum states via Kondo spins Ross McKenzie Sam Young Cho Reference: S.Y. Cho and R.H.M, Phys. Rev. A 73, (2006)
14. April 2003 Quantum Mechanics on the Large Scale Banff, Alberta 1 Relaxation and Decoherence in Quantum Impurity Models: From Weak to Strong Tunneling.

14. April 2003 Quantum Mechanics on the Large Scale Banff, Alberta 1 Relaxation and Decoherence in Quantum Impurity Models: From Weak to Strong Tunneling.
UCSD. Tailoring spin interactions in artificial structures Joaquín Fernández-Rossier Work supported by and Spanish Ministry of Education.

UCSD. Tailoring spin interactions in artificial structures Joaquín Fernández-Rossier Work supported by and Spanish Ministry of Education.
Advanced Semiconductor Physics ~ Dr. Jena University of Notre Dame Department of Electrical Engineering SIZE DEPENDENT TRANSPORT IN DOPED NANOWIRES Qin.

Advanced Semiconductor Physics ~ Dr. Jena University of Notre Dame Department of Electrical Engineering SIZE DEPENDENT TRANSPORT IN DOPED NANOWIRES Qin.
Shells and Supershells in Metal Nanowires NSCL Workshop on Nuclei and Mesoscopic Physics, October 23, 2004 Charles Stafford Research supported by NSF Grant.

Shells and Supershells in Metal Nanowires NSCL Workshop on Nuclei and Mesoscopic Physics, October 23, 2004 Charles Stafford Research supported by NSF Grant.

Similar presentations

Ads by Google