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Topological insulator plasmonics

PGR-P-1117

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Key facts

Type of research degree
PhD
Application deadline
Monday 31 January 2022
Project start date
Saturday 1 October 2022
Country eligibility
International (open to all nationalities, including the UK)
Funding
Funded
Source of funding
Doctoral training partnership
Supervisors
Dr Joshua Freeman and Professor Edmund Linfield
Additional supervisors
Dr Satoshi Sasaki
Schools
School of Electronic and Electrical Engineering
Research groups/institutes
Pollard Institute
<h2 class="heading hide-accessible">Summary</h2>

Topological insulators (TIs) are a new type of material that has recently been discovered. They have highly conductive surface states, while their bulk remains insulating. Because of extremely strong spin-orbit coupling in these materials, surface electrons have a spin-momentum locking texture, so that they are almost free from scattering, known as topological protection. The electrons are also massless Dirac particles similar to those in graphene, even at room temperature.<br /> <br /> While most work to-date has been focused on the use of TIs in electronic devices, there have recently been exciting theoretical proposals of how this new type of material interacts with light. These have predicted exotic light-matter interactions between the surface electrons in the TI and photons. Because the topologically protected carriers are confined to the surface of the material, by controlling the physical shape of the material on the nanometer scale the material interaction with light can be controlled. These interactions represent a new type of light-matter phenomena and could lead to applications in sensor technology, optical coatings and new laser technologies.

<h2 class="heading hide-accessible">Full description</h2>

<p>The predicted interactions are strongest in the terahertz (THz) region of the spectrum that lies between the microware and infrared. It has traditionally been difficult to access this part of the spectrum, however, the UoL is a leader in this field and has a number of state-of-the-art THz laboratories. The THz region is ideal for this type of research because modern femtosecond lasers and nanofabrication technology are able to access timescales and length scales well below those of terahertz waves leading to very precise measurement and control of the electromagnetic field.</p> <p>This project will explore the interaction between THz light and TI nanostructured materials and will be based in the Bragg centre. The topological thin films will be grown using the recently commissioned Royce-funded multi-deposition chamber. The TI materials that will be studied are Bi<sub>2</sub>Se<sub>3</sub>, (Bi<sub>1-x</sub>Sb<sub>x</sub>)<sub>2</sub>Te<sub>3</sub> and TI-based heterostructures (e.g. TI p-n junction, TI/magnetic thin film or TI/supercondutor). Sample characterization will be carried out by a range of techniques available in the Bragg centre, including XRD, EDX, SEM and magnetoelectric transport measurements. The device fabrication will be carried out in the state-of-the-art nanofabrication facilities available in the nanotechnology cleanroom and measured in the THz laboratories.</p> <p>This project aims to identify exotic light-matter interactions such as the &ldquo;topological surface plasmon polariton&rdquo; that have been theoretically predicted. Demonstration of these new types of excitations and interactions will not only be of interest to scientific researchers, but open the way to a number of potential applications.</p>

<h2 class="heading">How to apply</h2>

<p>Formal applications for research degree study should be made online through the&nbsp;<a href="https://www.leeds.ac.uk/research-applying/doc/applying-research-degrees">University&#39;s website</a>. Please state clearly in the Planned Course of Study section that you are applying for <em><strong>PHD Electronic &amp; Electrical Engineering FT</strong></em>&nbsp;in the research information section&nbsp;that the research degree you wish to be considered for is <em><strong>Topological insulator plasmonics</strong></em> as well as&nbsp;<a href="https://eps.leeds.ac.uk/electronic-engineering/staff/622/dr-joshua-freeman">Dr Joshua Freeman</a> as your proposed supervisor.</p> <p>If English is not your first language, you must provide evidence that you meet the University&#39;s minimum English language requirements (below).</p> <p>&nbsp;</p>

<h2 class="heading heading--sm">Entry requirements</h2>

Applicants to research degree programmes should normally have at least a first class or an upper second class British Bachelors Honours degree (or equivalent) in an appropriate discipline. The criteria for entry for some research degrees may be higher, for example, several faculties, also require a Masters degree. Applicants are advised to check with the relevant School prior to making an application. Applicants who are uncertain about the requirements for a particular research degree are advised to contact the School or Graduate School prior to making an application.

<h2 class="heading heading--sm">English language requirements</h2>

The minimum English language entry requirement for research postgraduate research study is an IELTS of 6.0 overall with at least 5.5 in each component (reading, writing, listening and speaking) or equivalent. The test must be dated within two years of the start date of the course in order to be valid. Some schools and faculties have a higher requirement.

<h2 class="heading">Funding on offer</h2>

<p>A highly competitive EPSRC Doctoral Training Partnership Studentship consisting of the award of fees with a maintenance grant (currently 15,609 GBP in session 2021/22) for 3.5 years.<br /> <br /> This opportunity is open to all applicants, with a number of awards for Non-UK nationals limited by UKRI to 1.&nbsp;&nbsp;All candidates will be placed into the EPSRC Doctoral Training Partnership Studentship and selection is based on academic merit.<br /> <br /> Please refer to the&nbsp;<a href="https://www.ukcisa.org.uk/">UKCISA</a> website for information regarding Fee Status for Non-UK Nationals starting from September/October 2021.</p>

<h2 class="heading">Contact details</h2>

<p>For further information regarding the project, please contact Dr Joshua Freeman: j.r.freeman@leeds.ac.uk</p> <p>For further information please contact the Graduate School Office<br /> e:&nbsp;<a href="mailto:phd@engineering.leeds.ac.uk">phd@engineering.leeds.ac.uk</a>, t: +44 (0)113 343 37128.</p>


<h3 class="heading heading--sm">Linked funding opportunities</h3>
<h3 class="heading heading--sm">Linked research areas</h3>