{"title":"Impurity affected transport properties of quantum well heterostructures with electronic and high-κ dielectric quantum screening","authors":"","doi":"10.1016/j.physb.2024.416535","DOIUrl":null,"url":null,"abstract":"<div><p>The effect of electronic and high-κ dielectric quantum screening (<em>ES</em> and <em>DS</em>) on the impurity-limited electron transport properties of <em>quantum well/high-κ dielectric barrier</em> type heterostructures with two-dimensional electron gas (<em>2DEG</em>) is studied theoretically. Characteristic of these heterosystems the <em>2D</em> compound forms of screened impurity potential are employed for the first time. In the framework of <em>2D</em> Debye-Hückel potential form an electron momentum relaxation time (<span><math><mrow><mi>τ</mi></mrow></math></span>) expression depending on the impurity <em>2D</em> screening radius is obtained analytically. A numerical analysis of <span><math><mrow><mi>τ</mi></mrow></math></span> is carried out for the realistic <em>HfO/InSb/HfO</em><sub><em>2</em></sub> <em>QW</em> heterostructure taking account both the finite mismatch of the energy bands at the heterointerface and the energy band non-parabolicity of <em>InSb</em>. The contributions of screened potential compound <em>2D</em> forms to <span><math><mrow><mi>τ</mi></mrow></math></span> are established depending on <em>QW</em> width. A significant suppression of the scattering rate <span><math><mrow><msup><mi>τ</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span> (by an order of magnitude) is received with accounting of <em>ES</em> + <em>DS</em> combined effect.</p></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B-condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921452624008767","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
The effect of electronic and high-κ dielectric quantum screening (ES and DS) on the impurity-limited electron transport properties of quantum well/high-κ dielectric barrier type heterostructures with two-dimensional electron gas (2DEG) is studied theoretically. Characteristic of these heterosystems the 2D compound forms of screened impurity potential are employed for the first time. In the framework of 2D Debye-Hückel potential form an electron momentum relaxation time () expression depending on the impurity 2D screening radius is obtained analytically. A numerical analysis of is carried out for the realistic HfO/InSb/HfO2QW heterostructure taking account both the finite mismatch of the energy bands at the heterointerface and the energy band non-parabolicity of InSb. The contributions of screened potential compound 2D forms to are established depending on QW width. A significant suppression of the scattering rate (by an order of magnitude) is received with accounting of ES + DS combined effect.
期刊介绍:
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces