نتایج جستجو برای: carrier states

تعداد نتایج: 520248  

Journal: :Physical chemistry chemical physics : PCCP 2017
B Pattengale J Huang

Monoclinic-scheelite BiVO4 has been widely studied as a promising oxygen evolution reaction (OER) catalyst in artificial photosynthesis. Though significant progress to improve or augment its catalysis performance has been made, fundamental understanding of its relatively poor performance as a bare material is lacking. In this paper, we report the correlation of the surface structure and trap st...

2008
Constantinos Simserides Iosif Galanakis

Due to the competition between spatial and magnetic confinement, the density of states of a quasi two-dimensional system deviates from the ideal step-like form both quantitatively and qualitatively. We study how this affects the spin-subband populations and the spin-polarization as functions of the temperature, T , and the in-plane magnetic field, B, for narrow to wide dilute-magnetic-semicondu...

Journal: :Physical chemistry chemical physics : PCCP 2016
Nils Lenngren Mohamed A Abdellah Kaibo Zheng Mohammed J Al-Marri Donatas Zigmantas Karel Žídek Tõnu Pullerits

Colloidal quantum dots (QDs) have attracted interest as materials for opto-electronic applications, wherein their efficient energy use requires the understanding of carrier relaxation. In QDs capped by bifunctional thiols, used to attach the QDs to a surface, the relaxation is complicated by carrier traps. Using 2D spectroscopy at 77 K, we follow excitations in thiol-capped CdSe QDs with state ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Kyounghwan Kim Ashley DaSilva Shengqiang Huang Babak Fallahazad Stefano Larentis Takashi Taniguchi Kenji Watanabe Brian J LeRoy Allan H MacDonald Emanuel Tutuc

According to electronic structure theory, bilayer graphene is expected to have anomalous electronic properties when it has long-period moiré patterns produced by small misalignments between its individual layer honeycomb lattices. We have realized bilayer graphene moiré crystals with accurately controlled twist angles smaller than 1° and studied their properties using scanning probe microscopy ...

Journal: :Health affairs 2004
Kenneth E Thorpe

By many accounts, the United States is in the midst of its third medical malpractice "crisis." Physicians in several states are facing high and rising premiums. The largest national medical malpractice carrier and some large multistate physician-backed liability firms have recently left the market. Rising premiums are traced largely to increases in claims severity. Capping malpractice payments ...

2010
S. E. Tyaginov I. A. Starkov O. Triebl J. Cervenka C. Jungemann S. Carniello J. M. Park H. Enichlmair M. Karner E. Seebacher R. Minixhofer H. Ceric T. Grasser

We refine our approach for hot-carrier degradation modeling based on a thorough evaluation of the carrier energy distribution by means of a full-band Monte-Carlo simulator. The model is extended to describe the linear current degradation over a wide range of operation conditions. For this purpose we employ two types of interface states, namely, created by singleand by multiple-electron processe...

Journal: :Optics express 2008
Sedat Nizamoglu Hilmi Volkan Demir

We investigate multi-color spontaneous emission from quantum-dot- quantum-well heteronanocrystals made of onion-like (CdSe)ZnS/CdSe/ZnS (core)shell/shell/shell structures, with our theoretical results explaining experimental measurements for the first time. In such multi-layered heteronanocrystals, we discover that the carrier localization is tuned from type-1-like to type-2-like localization b...

Journal: :Nano letters 2014
Dohun Kim Paul Syers Nicholas P Butch Johnpierre Paglione Michael S Fuhrer

We measure gate-tuned thermoelectric power of mechanically exfoliated Bi2Se3 thin films in the topological insulator regime. The sign of the thermoelectric power changes across the charge neutrality point as the majority carrier type switches from electron to hole, consistent with the ambipolar electric field effect observed in conductivity and Hall effect measurements. Near the charge neutrali...

2015
Pascal Gehring Kristina Vaklinova Alexander Hoyer Hadj M. Benia Viera Skakalova Giacomo Argentero Franz Eder Jannik C. Meyer Marko Burghard Klaus Kern

Three-dimensional topological insulators comprise topologically protected surface states displaying massless, Dirac-like linear dispersion with spin-momentum locking. Electrical conduction through such surface states has been documented to manifest itself in a two-dimensional character of the angle-dependent magnetotransport behavior. Here, we explore the size-dependent electronic properties of...

Journal: :international journal of environmental research 0
a.h. javid department of environmental engineering, graduate school of the environment and energy, science and research branch, islamic azad university, tehran, iran a.h. hassani department of environmental engineering, graduate school of the environment and energy, science and research branch, islamic azad university, tehran, iran b. ghanbari department of environmental health engineering, graduate school of public health, tehran medical branch, islamic azad university, tehran, iran k. yaghmaeian department of environmental health engineering, school of public health, tehran university of medical sciences, tehran, iran

in this study, feasibility of upgrading and retrofitting municipal wastewater treatment plantswas investigated at laboratory scale using moving bed biofilm reactor (mbbr) process. for this purpose,an aerobic pilot was operated for nearly one year in different conditions, in which a moving bed carrier with aspecific biofilm surface area of 500 m2/m3 and a filling rate of 60% was utilized. system...

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