[Polish version]

Prof. Dr Hab. Eng.  Arkadiusz Wójs

Dean
Faculty of Fundamental Problems of Technology

Head
Department of Theoretical Physics

Professor
Wrocław University of Science and Technology

Member of Academia Europaea

Wybrzeże Wyspiańskiego 27
50-370 Wrocław, Poland

Room: 235/A1 (Main Building)

Email: arkadiusz.wojs@pwr.edu.pl

Tel: +48 71 320 3192 (office)

Tel: +48 607 234 798 (mobile)

publications

invited
lectures

Research interests:

• theoretical condensed matter physics, topological effects

• collective phenomena in low-dimensional electronic systems

• quantum liquids, quantum Hall effect, composite fermions

• anyon and nonabelian quantum statistics, topological quantum computation

• excitonic complexes in low-dimensional systems, magneto-optics, trions

• graphene, carbon nanostructures, two-dimensional crystals

Recent publications:

   Probing of free and localized excitons and trions in atomically thin WSe2, WS2, MoS2 and MoS2 in photoluminescence and reflectivity experiments

J. Jadczak, J. Kutrowska-Girzycka, P. Kapuściński, Y.-S. Huang, A. Wójs, L. Bryja
Nanotechnology 28, 395702 (2017)

   The enigma of the ν=2+3/8 fractional quantum Hall effect

J. A. Hutasoit, A. C. Balram, S. Mukherjee, Y.-H. Wu, S. S. Mandal, A. Wójs, V. Cheianov, J. K. Jain
Physical Review B 95, 125302 (2017)

   Energy spectrum of confined positively charged excitons in single quantum dots

M. R. Molas, A. Wójs, A. A. L. Nicolet, A. Babinski,  M. Potemski
Physical Review B 94, 235416 (2016)

   Landau-level mixing and particle-hole symmetry breaking for spin transitions in the fractional quantum Hall effect

Y.  Zhang, A. Wójs, J. K. Jain
Physical Review Letters 117, 116803 (2016)

   Thermal dissociation of free and acceptor-bound positive trions from magnetophotoluminescence studies of high quality GaAs/AlxGa1-xAs quantum wells

L. Bryja, J. Jadczak, K. Ryczko, M. Kubisa, J. Misiewicz, A.Wójs, F. Liu, D. R. Yakovlev, M. Bayer, C. A. Nicoll, I. Farrer, D. A. Ritchie
Physical Review B 93, 165303 (2016)

   Fractionally charged skyrmions in fractional quantum Hall effect

A. C. Balram, U. Wurstbauer, A. Wójs, A. Pinczuk, J. K. Jain
Nature Communications 6, 8981 (2015)

   Spontaneous polarization of composite fermions in the n=1 Landau level of graphene

A. C. Balram, C. Tőke, A. Wójs, J. K. Jain
Physical Review B 92, 205120 (2015)

   Fractional quantum Hall effect in graphene: Quantitative comparison between theory and experiment

A. Balram, C. Tőke, A. Wójs, J. K. Jain
Physical Review B 91, 075410 (2015)

   Phase diagram of fractional quantum Hall effect of composite fermions in multicomponent systems

A. Balram, C. Tőke, A. Wójs, J. K. Jain
Physical Review B 91, 045109 (2015)

Academic achievements:

• Highly cited works:

1 book  cited ~1000 times (quantum dots)

6 articles cited  > 100 times (quantum dots, trions in 2D)

• 4 books, including:

L. Jacak, P. Hawrylak, A. Wójs, Quantum Dots, Springer-Verlag (1998)

L. Jacak, P. Sitko, K. Wieczorek, A. Wójs, Quantum Hall Systems, Oxford University Press (2003)

• 175 articles indexed by Web of Science, including:

Physics Reports, Nature Communications, Physical Review Letters (10), Physical Review B (51), Applied Physics Letters, Nanotechnology

• 2712 citations (2006 without self-citations), Hirsch index h=26 --- by Web of Science; excluding books

Google Scholar: 4359 citations, h=30

• 47 invited lectures, including:

Modulated Semiconductor Structures, Santa Barbara, CA, USA (1997)

High Magnetic Fields in Semiconductor Physics, Oxford, UK (2002)

March Meeting of American Physical Society, Austin, TX, USA (2003)

Electronic Properties of Two-Dimensional Systems, Genoa, Italy (2007)

Computational Physics, Gatlinburg, TN, USA (2011)

Emerging Phenomena in Quantum Hall Systems, Rehevot, Israel (2014)

Major scientific accomplishments:

• Electronic structure and optical properties of self-assembled quantum dots

Calculations of electronic structure of self-assembled quantum dots depending on their shape, size, and composition; discovery that electron and hole energy levels fall into essentially degenerate and equidistant shells of a two-dimensional harmonic oscillator [PRB 54, 5604 (1996)]; studies of the consequences of that fact on the intra- and inter-band optical transitions and on capacitance spectra of quantum dots [PRB 53, 10841 (1996)]; understanding of the multi-peak structure of the photoluminescence spectrum of charged quantum dots [PRB 55, 13066 (1997)]; identification of the "hidden symmetry" and its manifestations in the optical spectra of highly excited dots, especially in effective selection rules reducing the optical spectra of multi-exciton dots [SSC 100, 487 (1996)].

• Trions in high magnetic fields

Prediction of a bound 2e+h state in high magnetic fields, i.e., of the dark triplet trion (confirmed in many subsequent experiments) [PRB 51, 10880 (1995)]; explanation of the apparent absence of singlet-triplet crossing in the trion photoluminescence spectrum in high magnetic fields; prediction of an excited, weakly bound, bright triplet trion state (also later confirmed experimentally and now well-known); prediction of an effective decoupling of trions from the surrounding electron liquid with Laughlin correlations [PRB 62, 4630 (2000)]; extension of the trion concept in optical spectra of correlated fractional quantum Hall states; prediction of the family of fractionally charged "quasiexciton" states [PRB 73, 235338 (2006)]; determination of trion phase diagram in realistic systems [PRB 75, 085318 (2007); PRB 76, 085344 (2007)].

• Composite fermion theory of fractional quantum Hall effect

Identification of the crucial role of the positive component of anharmonic interaction pseudopotential in the formation of composite fermions [PMB 80, 1405 (2000)]; clarification of the relation between the hierarchical and composite fermion descriptions of the Jain sequence of fractional quantum Hall states [PRB 61, 2846 (2000)].

• Spin dynamics of fractional quantum Hall systems

Theory of hyperfine coupling between a ferromagnetic incompressible electron liquid and the underlying lattice of nuclear spins [PRB 66, 165318 (2002)]; analogy between integral and fractional quantum Hall ferromagnets [PRB 66, 045323 (2002)]; demonstration of the formation of skyrmios in a fluid of valence holes [PRB 73, 241302 (R) (2006)].

• Nonabelian quantum statistics in fractional quantum Hall states

Explanation of partial spin depolarization of the 5/2 quantum Hall state in terms of "skyrmions" formed from pairs of quasiparticles in the presence of realistic disorder [PRL 104, 086801 (2010)]; demonstration of adiabatic connection (i.e. topological equivalence) between nonabelian elementary excitations of Coulomb and Pfaffian ground states at Landau filling fraction 5/2; discovery that realistic Landau level mixing stabilizes Pfaffian dynamics [PRL 105, 096802 (2010)]; prediction of various composite fermion phases in systems of cold atoms with short range three-body repulsion [PRL 105, 196801 (2010)]; concept of multiple composite fermion partitions for description of nonabelian "parafermion" states [PRL 107, 086806 (2011)]; microscopic theory of the „neutral fermion” excitation in paired states of composite fermions [PRL 107, 036803 (2011); PRL 107, 136802 (2011)]; understanding of the so-called "second generation" fractional quantum Hall state 3/8 as the nonabelian „anti-Pfaffian” state of composite fermions [PRL 109, 245125 (2012)]; demonstration of Laughlin mechanism for incompressibility of the 7/3 state and distinction of its elementary excitations (qusiparticles) – as a result of strong excitonic effects among composite fermions [PRL 110, 186801 (2013)].

International collaboration:

Jainendra K. Jain (Pennsylvania State University, USA)

Nigel R. Cooper, Gunnar Möller (University of Cambridge, UK)

Steven H. Simon (University of Oxford, UK)

John J. Quinn (University of Tennessee, USA)

Pawel Hawrylak (University of Ottawa, Canada)

• Csaba Tőke (University of Pécs, Hungary)

• Sudhansu Sekhar Mandal (Indian Association for the Cultivation of Science)

• Ganesh Jaya Sreejith (NORDITA, Sweden)

• Devrim Güçlü (Izmir Institute of Technology, Turkey)

• Marek Potemski (CNRS High Magnetic Field Laboratory, France)

• Manfred Bayer, Dmitri Yakovlev (Technical University of Dortmund, Germany)

• Daniela Pfannkuche (University of Hamburg, Germany)

• Karel Vyborny (Academy of Sciences, Czech Republic)

• Rolf Haug (Leibnitz University of Hannover, Germany)

• Dirk Reuter, Andreas D. Wieck (Ruhr Universität Bochum, Germany)

Academic degrees:

• Master of Science (MSc) – solid state physics (23 June 1995)
Quantum dots
Faculty of Fundamental Problems in Technology, Wrocław University of Technology

• Doctorate (PhD) – condensed matter physics (6 June 1997)
Electronic structure of semiconductor quantum dots
Institute of Physics, Wrocław University of Technology

• Habilitation (DSc) – solid state physics (21 February 2002)
Optoelectronic properties of the Laughlin incompressible electron liquid
Faculty of Fundamental Problems in Technology, Wrocław University of Technology

• Professor (academic title granted by President of Poland) – physical sciences (13 January 2009)
Faculty of Fundamental Problems in Technology, Wrocław University of Technology

Employment:

• Wrocław University of Science and Technology*, Department of Theoretical Physics (from 2014)
presently: Ordinary/Full Professor, Head of Department, Dean of Faculty;  *English name change in  2016

• Wrocław University of Technology, Institute of Physics (1997-2014)
subsequently: Reader, Extraordinary/Associate Professor, and Ordinary/Full Professor; Deputy Dean

• National Research Council, Canada (1995-1996)
doctoral training

• University of Tennessee, USA (1997-2000)
post-doctoral fellowship

• University of Tennessee, USA (2000-2008; 2-4 months/year)
visiting professor

• University of Cambridge, Wielka Brytania (2008-2010)
Marie Curie Fellowship

• Short visits (consultations/lectures), e.g.:
Grenoble High Magnetic Field Laboratory, Universität Hamburg, Technische Universität Dortmund, Leibnitz Universität Hannover, Universität Regensburg, Los Alamos National Laboratory, Academy of Sciences of the Czech Republic

Grants:

• 2 „Marie Curie” grants from European Union:

Intra-European Fellowship, University of Cambridge, UK (2008-2010)
Opto-electronic properties of graphene and other carbon nanostructures

Career Integration Grant, Wrocław University of Technlogy (2011-2014)
Exotic quantum phases in graphene and other modern nanomaterials - physical foundation for quantum information technology

• Professor Academic Grant of Foundation for Polish Science „Master”:

FNP-MISTRZ, 300 000 PLN (2013-2015)
Magneto-optics of correlated spin 3/2 carriers in semiconductor nanostructures (for applications in quantum information processing)

• Several grants from KBN/MNiSW/NCN, including:

NCN-OPUS, 1 235 000 PLN (2012-2014)
Studies of topological properties of strongly correlated electron systems regarding their application in quantum information processing

NCN-MAESTRO, 3 733 160 PLN (15.05.2015-14.05.2020)
Topological effects in advanced low-dimensional materials

Appointments in scientific organizations:

• Scientific Council of Faculty of Fundamental Problems of Technology / Wrocław University of Technology (chairman)

• Scientific Council of Institute of Low Temperature and Structure Research / Polish Academy of Sciences (member)

• Academia Europaea (member)

• International Union of Pure and Applied Physics (IUPAP), Commission 17: Laser Physics and Photonics (member)

Awards:

• Hugo Steinhaus Award of the Rector of Wrocław University of Technology (2013)

• APS Outstanding Referee – Physical Review, Physical Review Letters, Reviews of Modern Physics (2013)

• Professor Academic Grant of Foundation for Polish Science „Master” (2012)

• Award of Polish Ministry of Science and Higher Education – for outstanding scientific achievement in fundamental research (2011)

• W. Rubinowicz Award of Polish Physical Society – for work on quantum statistics (2008)

• EU Marie Curie Fellowship (2008)

• Team Award of Polish Ministry of National Education (2004)

• Award of Polish Prime Minister – for outstanding habilitation thesis (2003)

• S. Pieńkowski Award of Polish Academy of Sciences – for work on quantum Hall effect (2002)

• Award of Polish Ministry of National Education – for PhD thesis (1998)

• Fellowship of Foundation for Polish Science (1997)

• A. Piekara Award of Polish Physical Society – for MSc thesis (1996)

Links:

Polish Physical Society

Web of Science

APS Journals

Wolfram Alpha

Wolfram Demonstrations Project

Google Scholar

Research Gate