scholarly journals Nanowires with surface disorder: Giant localization length and dynamical tunneling in the presence of directed chaos

2009 ◽  
Vol 80 (24) ◽  
Author(s):  
J. Feist ◽  
A. Bäcker ◽  
R. Ketzmerick ◽  
J. Burgdörfer ◽  
S. Rotter
Keyword(s):  
Localization Length ◽  
Surface Disorder

Emergence of size induced metallic state in the ferromagnetic insulating Pr0.8Sr0.2MnO3 manganite: Breaking of surface polarons

2015 ◽  
Vol 8 (2) ◽  
pp. 2084-2093 ◽  
Author(s):  
PROLOY TARAN DAS ◽  
Arun Kumar Nigam ◽  
Tapan Kumar Nath
Keyword(s):  
Transport Properties ◽  
Metallic State ◽  
Temperature Dependent ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
System A ◽  
Surface Disorder ◽  
Bulk System ◽  
Magnetic Transport ◽  
Grain Surface

Nano-dimensional effects on electronic-, magneto-transport properties of granular ferromagnetic insulating (FMI) Pr0.8Sr0.2MnO3 (PSMO) manganite (down to 40 nm) have been investigated in details. From the electronic and magnetic transport properties, a metallic state has been observed in grain size modulation by suppressing the ferromagnetic insulating state of PSMO bulk system. A distinct metal-insulator transition (MIT) temperature around 150 K has been observed in all nanometric samples. The observed insulator to metallic transition with size reduction can be explained with surface polaron breaking model, originates due to enhanced grain surface disorder. This proposed phenomenological polaronic model plays a significant role to understand the polaronic destabilization process on the grain surface regime of these phase separated nano-mangnatie systems. Temperature dependent resistivity and magnetoresistance data in presence of external magnetic fields are investigated in details with various compatible models.

scholarly journals Non-Linear Thermoelectric Devices with Surface-Disordered Nanowires

Applied Nano ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 162-183
Author(s):  
Peter Markoš ◽  
Khandker Muttalib
Keyword(s):  
Thermodynamic Parameters ◽  
Power Output ◽  
Heat Current ◽  
Linear Regime ◽  
Thermoelectric Devices ◽  
Charge Current ◽  
Thermal Current ◽  
Surface Disorder ◽  
Non Linear

We reviewed some recent ideas to improve the efficiency and power output of thermoelectric nano-devices. We focused on two essentially independent aspects: (i) increasing the charge current by taking advantage of an interplay between the material and the thermodynamic parameters, which is only available in the non-linear regime; and (ii) decreasing the heat current by using nanowires with surface disorder, which helps excite localized phonons at random positions that can strongly scatter the propagating phonons carrying the thermal current.

scholarly journals Synergetic Enhancement of Light Harvesting and Charge Separation over Surface-Disorder-Engineered TiO 2 Photonic Crystals

Chem ◽  
2017 ◽  
Vol 2 (6) ◽  
pp. 877-892 ◽  
Author(s):  
Jinmeng Cai ◽  
Moqing Wu ◽  
Yating Wang ◽  
Hao Zhang ◽  
Ming Meng ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Charge Separation ◽  
Light Harvesting ◽  
Surface Disorder

q-BREATHERS IN FPU-LATTICES — SCALING AND PROPERTIES FOR LARGE SYSTEMS

2007 ◽  
Vol 21 (23n24) ◽  
pp. 3925-3932 ◽  
Author(s):  
SERGEJ FLACH ◽  
OLEG I. KANAKOV ◽  
KONSTANTIN G. MISHAGIN ◽  
MIKHAIL V. IVANCHENKO
Keyword(s):  
Energy Density ◽  
Normal Modes ◽  
Localization Length ◽  
Nonlinearity Parameter ◽  
First Finding ◽  
Nonlinear Lattices ◽  
Intensive Quantities ◽  
Time Periodic Solutions ◽  
Large Systems ◽  
Time Periodic

Recently q-breathers - time-periodic solutions which localize in the space of normal modes and maximize the energy density for some mode vector q0 - were obtained for finite nonlinear lattices. We scale these solutions to arbitrarily large lattices in various lattice dimensions. We study the scaling consequence for previously obtained analytical estimates of the localization length of q-breathers for β-FPU and α-FPU lattices. The first finding is that the degree of localization depends only on intensive quantities and is size independent. Secondly, a critical wave vector km is identified, which depends on one effective nonlinearity parameter, q-breathers minimize the localization length at k0 = km and completely delocalize in the limit k0 → 0, π.

scholarly journals LOCALIZED ENTANGLEMENT IN ONE-DIMENSIONAL ANDERSON MODEL

2005 ◽  
Vol 19 (11) ◽  
pp. 517-527 ◽  
Author(s):  
HAIBIN LI ◽  
XIAOGUANG WANG
Keyword(s):  
Anderson Model ◽  
Localization Length ◽  
Direct Relation ◽  
Disorder Strength ◽  
One Dimensional ◽  
Entanglement Distribution ◽  
Localization Center

The entanglement in one-dimensional Anderson model is studied. The pairwise entanglement has a direct relation to the localization length and is reduced by disorder. Entanglement distribution displays the entanglement localization. The pairwise entanglements around localization center exhibit a maximum as the disorder strength increases. The dynamics of entanglement are also investigated.

Evidence for long localization length alongbaxisPrBa2Cu3O7inaaxisYBa2Cu3O7/a,baxisPrBa2Cu3O7superlattices

1994 ◽  
Vol 73 (2) ◽  
pp. 328-331 ◽  
Author(s):  
Y. Suzuki ◽  
J.-M. Triscone ◽  
C. B. Eom ◽  
M. R. Beasley ◽  
T. H. Geballe
Keyword(s):  
Localization Length

scholarly journals Hot-Electron Effects in Two-Dimensional Hopping with a Large Localization Length

2000 ◽  
Vol 85 (8) ◽  
pp. 1718-1721 ◽  
Author(s):  
M. E. Gershenson ◽  
Yu. B. Khavin ◽  
D. Reuter ◽  
P. Schafmeister ◽  
A. D. Wieck
Keyword(s):  
Localization Length ◽  
Two Dimensional ◽  
Hot Electron ◽  
Electron Effects

scholarly journals A STUDY OF DISORDERED SYSTEMS WITH GAIN: STOCHASTIC AMPLIFICATION

2000 ◽  
Vol 14 (16) ◽  
pp. 1669-1681 ◽  
Author(s):  
SANDEEP K. JOSHI ◽  
A. M. JAYANNAVAR
Keyword(s):  
Reflection Coefficient ◽  
Disordered Systems ◽  
Random Phase Approximation ◽  
Random Medium ◽  
Random Phase ◽  
Localization Length ◽  
Critical Length ◽  
Sample Length ◽  
Coherent Amplification ◽  
Transmission And Reflection

A study of statistics of transmission and reflection from a random medium with stochastic amplification as opposed to coherent amplification is presented. It is found that the transmission coefficient t, for sample length L less than the critical length L c grows exponentially with L. In the limit L→∞ transmission decays exponentially as < ln t>=-L/ξ where ξ is the localization length. In this limit reflection coefficient r saturates to a fixed value which shows a monotonic increase as a function of strength of amplification α. The stationary distribution of super-reflection coefficient agrees well with the analytical results obtained within the random phase approximation (RPA). Our model also exhibits the well known duality between absorption and amplification. We emphasize the major differences between coherent amplification and stochastic amplification where-ever appropriate.

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