Research Studentships for students of a course that does not award an academic degree - (BL20/2024_IST-ID)

11 Mar 2024
Job Information

Organisation/Company

Associação do Instituto Superior Técnico para a Investigação e Desenvolvimento _IST-ID

Department

DRH

Research Field

Physics » Other

Researcher Profile

First Stage Researcher (R1)

Country

Portugal

Application Deadline

25 Mar 2024 - 23:59 (Europe/Lisbon)

Type of Contract

Not Applicable

Job Status

Not Applicable

Is the job funded through the EU Research Framework Programme?

Not funded by an EU programme

Reference Number

QuantERA/0003/2021

Is the Job related to staff position within a Research Infrastructure?

No

Offer Description

Applications are open for one (1) Research Studentships, within the framework of project(1801P.01178.1.01) DQUANT - QuantERA/0003/2021 - IST-ID financed by national funds through FCT/MCTES (PIDDAC)

Workplan: Stability of quantum liquid phases against environment-induced dissipation

There is no such thing as an isolated quantum system in nature. Given a system of interest be it a quantum computer based on superconducting qubits, atoms in an optical trap or a solid state magnet in a cryostat it is always coupled, no matter how weakly, to external degrees of freedom that form an environment or bath. Generically the environment brings about dissipation often thermalizing the system while also causing it to lose some degree of quantum coherence. This is a much-studied topic especially for elementary quantum systems coupled to a quantum environment. 

 

This project is about the effects of quantum baths on many-body systems. Often it is reasonable to assume that the primary effect of the bath is to bring the system to some finite temperature. However, sometimes this assumption is incorrect. A recent case is the famous spin one-half Heisenberg chain. When isolated, the ground state of this model is quantum disordered and the elementary excitations form a continuum of arbitrarily low energy states. However, in the presence of an Ohmic quantum bath the system is unstable to long-range order in apparent violation of the Mermin-Wagner theorem. This remarkable finding suggests that there may be further examples where the presence of a bath radically alters the low energy physics.

The result on the Heisenberg chain was been established numerically using Quantum Monte Carlo (QMC). QMC is one of the most powerful tools to study the collective behaviour of many-particle systems at strong coupling. Two of the most used approaches to QMC in quantum condensed matter physics are the Stochastic Series Expansion method and the Continuous Time Path Integral Monte Carlo method. These have much in common but the latter is better adapted to the problem under consideration. However, the coupling to bosonic bath degrees of freedom has only been carried through for the former method. Therefore the first goal of the project is to adapt Continuous Time Path Integral Monte Carlo so that it can be used in the presence of a coupling to a bath. This is a significant step requiring careful theoretical work before implementing it computationally. 

The algorithm, once developed, will be applied to some selected examples. The first example is the XXZ chain which is integrable for vanishing bath coupling and for which there is a controversy over the nature of the system as a function of the bath coupling. The second example is a higher dimensional quantum spin liquid which is of experimental interest.

Duration: The research fellowship(s) will have the duration of 3 months. It’s expected to begin as soon as possible and may not be renewed.

It is mandatory to formalize applications with the submission of the following documents: i) B1 Form – Fellowship application (https://ist-id.pt/concursos/bolsas/  ); ii) Curriculum Vitae; iii)academic degree certificate, where applicable; iv) proof of enrollment at a course that does not award an academic degree; v) motivation letter; vi) declaration on honour that the applicant does not exceed with this contract an accumulated period of two years in this type of studentship, continuously or with interruptions.

Applications must be submitted to the email: [email protected]

 

 

Requirements

Research Field

Physics » Other

Education Level

Bachelor Degree or equivalent

Skills/Qualifications

Admission Requirements:to hold a master degree and be enrolled at a course that does not award an academic degree and it is integrated in the educational project of a higher education institution, performed in association or cooperation with one or several R&D unit.

Additional Information
Benefits

Monthly maintenance allowance: According to the values for Research Fellowships awarded by FCT in Portugal (https://www.fct.pt/wp-content/uploads/2024/02/Tabela-de-Valores-SMM_atualizacao-2024.pdf ), the amount of the monthly maintenance allowance is €1259,64 being the payment method by Wire Transfer.

Eligibility criteria

Admission Requirements:to hold a master degree and be enrolled at a course that does not award an academic degree and it is integrated in the educational project of a higher education institution, performed in association or cooperation with one or several R&D unit.

Selection process

Selection methods: The selection methods will be the following: The selection methods to be used will be the following: curricular assessment and previous experience, with the respective valuation of 60 and 40 out of a total of 100 values.

Composition of the selection Jury: João Seixas, Pedro Sacramento, Pedro Ribeiro.

Announcement/ notification of the results: The final evaluation results will be communicated to all applicants by email.

Deadlines and procedures of complaint and appeal . A complaint may be lodged from the final decision within 15 working days, or an appeal to the Executive Board of IST-ID within 30 working days, both counted from the respective notification

Additional comments

Legislation and Regulations: Statute of Scientific Research Fellow, approved by Law nr. 40/2004, of August 18, as worded by Decree-Law nr. 123/2019, of August 28; FCT Regulation for Research Studentships and Fellowships, available on https://www.fct.pt/apoios/bolsas/docs/RegulamentoBolsasFCT2019.pdf and https://dre.pt/application/file/a/127230968 .

Workplace The work will be developed at CeFEMA, of Instituto Superior Técnico under the scientific supervision of Professor Pedro Ribeiro.

Website for additional job details

https://ist-id.pt/concursos/bolsas/

Work Location(s)

Number of offers available

1

Company/Institute

IST-ID

Country

Portugal

Geofield

Where to apply

E-mail

[email protected]

Contact

City

Lisbon

Website

http://ist-id.pt/

Street

Av. Rovisco Pais

Postal Code

1049-001 Lisboa

STATUS: EXPIRED