Electron electron interaction and instabilities in one dimensional metals

2007 ◽  
pp. 361-371
Author(s):  
T. V. Ramakrishnan
Keyword(s):  
Electron Interaction ◽  
One Dimensional

Charge ordering and ferroelectric states in organic quasi-one-dimensional conductors

2002 ◽  
Vol 12 (9) ◽  
pp. 133-138
Author(s):  
F. Nad ◽  
P. Monceau
Keyword(s):  
Phase Transitions ◽  
Charge Ordering ◽  
Electron Interaction ◽  
Charge Symmetry ◽  
Low Frequencies ◽  
One Dimensional ◽  
Thermally Activated ◽  
Correlated Electron ◽  
Temperature Dependences ◽  
New Phase

In quasi-one-dimensional (TMTTF)2X conductors [1], where X are the various centro-symmetrical and non-centrosymmetrical anions, by study of temperature dependences of conductance G and dielectric permittivity $\varepsilon '$ at low frequencies we have found anomalies which are characteristic for phase transitions: an abrupt bend on the G(l/T) dependences with thermally activated decrease of G and sharp maxima of the E' near the charge ordering temperature corresponding to the E' divergence according to the Curie law. A number of evidences have been obtained in favor that driving force of these phase transitions is the long range correlated electron interaction yielding the charge ordering along the molecular chains (a lattice version of the Wigner crystal). The anion chains, electrically balanced with molecular chains, are of very importance in the formation and the stabilization of these new phase states. It appears that the form of charge symmetry of the anions determines to a great extent the types of the occurring transitions and the developing ground states.

Collective mode dispersions of organic chain compounds

Open Physics ◽  
2010 ◽  
Vol 8 (3) ◽  
Author(s):  
Željana Lošić ◽  
Paško Županović
Keyword(s):  
Collective Mode ◽  
Random Phase ◽  
Tight Binding ◽  
Three Dimensional ◽  
Plasmon Mode ◽  
Optical Data ◽  
Electron Interaction ◽  
Coulomb Interactions ◽  
One Dimensional ◽  
Donor And Acceptor

AbstractWe investigate the collective mode dispersions for the tight-binding dielectric matrix with two one-dimensional electron bands per donor and acceptor chains, and the three-dimensional long-range Coulomb electron-electron interaction within the random phase approximation. The hybridized collective modes are the result of the strong coupling between the intraband plasmon and the interband dipolar modes due to strong dipole Coulomb interactions. Our calculations show the existence of the low-energy renormalized plasmon mode above the electron-hole quasi-continuum in the long wavelength limit. The obtained modes are brought into correspondence with the optical data of quasi-one-dimensional organic conductor tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ). Namely, the renormalized plasmon and the dipolar mode are assigned to the observed excitations at respective energy scales of roughly 10 meV and 0.75 eV, explaining why lower excitation is eliminated while higher excitation persists below the temperature of the Peierls phase transition.

scholarly journals Orbital Effect on Carbyne Based Sensor

2021 ◽  
Author(s):  
Mohammad Taghi Ahmadi ◽  
Zahra Heidari ◽  
Meisam Rahmani ◽  
Mahan Ahmadi
Keyword(s):  
Band Structure ◽  
Band Gap ◽  
Density Of States ◽  
Nearest Neighbors ◽  
Unit Cell ◽  
Dimensional Structure ◽  
Electron Interaction ◽  
Structure Variation ◽  
One Dimensional ◽  
Orbital Effect

Abstract Carbyne material with sp-hybridized atoms has been considered as a one dimensional structure with unique properties which has been widely used in nanotechnology. In the presented work the effect of electron overlap energy in the form of electron interaction with in the unit cell and nearest neighbors is explored. In addition, the band structure variation under proposed interaction in one dimensional carbyne is investigated. The effect of overlap energy variation inside and outside the unit cell on the band gap is intended. Under proposed structure the effective mass and density of states parameters are explored. It is demonstrated that by increasing the interaction between s and p orbitals in the unit cell, the band gap increases. However, the band gap is decreased by increasing the interaction between s and p orbitals out the unit cell which can be sued as a sensing mechanism.

1D AND 2D QUANTUM INTERFERENCE EFFECTS IN ELECTRON TRANSPORT IN Au FILM

2013 ◽  
Vol 27 (08) ◽  
pp. 1350026
Author(s):  
B. I. BELEVTSEV ◽  
E. Yu. BELIAYEV ◽  
Yu. A. KOLESNICHENKO
Keyword(s):  
Electron Transport ◽  
Quantum Interference ◽  
Weak Localization ◽  
Electron Interaction ◽  
Interference Effects ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
One Dimensional ◽  
Au Film ◽  
Nominal Thickness

We present transport properties of quench-condensed Au film with nominal thickness ≈3.56 nm and R□ ≈ 5 k Ω for T > 10 K. This film has weak nonmetallic temperature dependence of resistance with logarithmic behavior above 10 K and somewhat stronger dependence at low temperatures. Above 3 K only two-dimensional (2D) quantum interference effects in electron transport have been found; whereas, below 3 K both one-dimensional (1D) and 2D effects of weak localization (WL) and electron–electron interaction (EEI) can be distinguished. This reflects inhomogeneous structure of the film near the thickness-controlled metal-insulator transition (MIT).

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