Quantum many-particle research group

Thomas Vojta home
Research
Teaching
Pegasus Cluster


Physics Department

Current members

Thomas Vojta

Graduate students:
Jack Crewse
Ahmed Ibrahim

Undergraduate students:
Erac Kaiser
Steven Giangreco
Nicholas Parris
Phillip Janowski
Ian Ramsey

Alumni

Manal Al-Ali, PhD 2013, (thesis)
Hatem Barghathi, PhD 2016, (thesis)
Smaine Bekhechi, Postdoc 2000-2001
Mark Dickison, MS 2005, (thesis)
Frank Epperlein, PhD 1999, (thesis)
Jose Hoyos, Postdoc 2006-2007
Fawaz Hrahsheh, PhD 2013, (thesis)
Chetan Kotabage, PhD 2011, (thesis)
Man Young Lee, PhD 2011, (thesis)
David Nozadze, PhD 2013, (thesis)
Rastko Sknepnek, PhD 2004, (thesis)
Torsten Wappler, MS 1996

Collaborations

Daniel Arovas (UCSD), Dietrich Belitz (University of Oregon), Ronald Dickman (UFMG, Brazil), Paul Goldbart (Georgia Tech), Yew San Hor (Missouri S&T), Jose Hoyos (University of Sao Paulo, Brazil), Istvan Keszmarki (TU Budapest, Hungary), Ted Kirkpatrick (University of Maryland), Adrian del Maestro (University of Vermont), Wouter Montfrooij (University of Missouri), Rajesh Narayanan (IIT Madras, India), Bernd Rosenow (University of Leipzig, Germany) Joerg Schmalian (Karlsruhe Institute of Technology), Almut Schroeder (Kent State University), Greg Stewart (University of Florida), John Toner (University of Oregon), Matthias Vojta (University of Dresden, Germany)


Areas of interest

quantum and classical phase transitions
critical behavior
Griffiths singularities
strongly correlated electrons
magnetism and superconductivity
non-Fermi liquids
transport in disordered systems
metal-insulator transitions
non-equilibrium phase transitions

Publication list
Google Scholar Profile
Preprints on   arXiv.org

Sketch of a Griffiths region in a dilute ferromagnet

Pegasus IV parallel computer cluster


 Selected Recent Publications

REVIEW ARTICLES
Thomas Vojta, Phases and phase transitions in disordered quantum systems, arXiv:1301.7746 (Pedagogical introduction to strong disorder physics at quantum phase transitions. Based on lectures given at the XVII Training Course in the Physics of Strongly Correlated Systems in Vietri sul Mare, Italy in October 2012)
Thomas Vojta, Quantum Griffiths Effects and Smeared Phase Transitions in Metals: Theory and Experiment, J. Low Temp. Phys. 161, 299-323 (2010), arXiv:1005.2707
Thomas Vojta, Computing quantum phase transitions, Reviews in Computational Chemistry 26, 167-221 (2008), arxiv:0709.0964
Thomas Vojta, Rare region effects at classical, quantum and nonequilibrium phase transitions, J. Phys. A 39, R143-R205 (2006), cond-mat/0602312
D. Belitz, T.R. Kirkpatrick, and Thomas Vojta, How generic scale invariance influences quantum and classical phase transitions, Rev. Mod. Phys. 77, 579-632 (2005), cond-mat/0403182
Thomas Vojta, Quantum Phase Transitions in Electronic Systems, Annalen der Physik 9, 403-440 (2000), cond-mat/9910514
QUANTUM PHASE TRANSITIONS AND DISORDER
Hatem Barghathi and Thomas Vojta, Phase transitions on random lattices: How random is topological disorder?, Phys. Rev. Lett. 113, 120602 (2014), arXiv:1402.4425
L. Demkó, S. Bordács, T. Vojta, D. Nozadze, F. Hrahsheh, C. Svoboda, B. Dóra, H. Yamada, M. Kawasaki, Y. Tokura, and I. Kézsmárki, Disorder promotes ferromagnetism: Rounding of the quantum phase transition in Sr$_{1-x}$Ca$_x$RuO$_3$, Phys. Rev. Lett. 108, 185701 (2012), arXiv:1202.3810
S. Ubaid-Kassis, T. Vojta and A. Schroeder, Quantum Griffiths Phase in the Weak Itinerant Ferromagnetic Alloy Ni-V, Phys. Rev. Lett. 104, 066402 (2010), arXiv:0912.1146
Thomas Vojta, Chetan Kotabage and Jose A Hoyos, Infinite-randomness quantum critical points induced by dissipation, Phys. Rev. B 79, 024401 (2009), arXiv:0809.2699, see also accompanying Viewpoint Commentary by G. Refael, Physics 2, 1 (2009)
Jose A Hoyos and Thomas Vojta, Theory of smeared quantum phase transitions, Phys. Rev. Lett. 100, 240601 (2008), arXiv:0802.2303
Jose A Hoyos, Chetan Kotabage and Thomas Vojta, Effects of Dissipation on a Quantum Critical Point with Disorder, Phys. Rev. Lett. 99, 230601 (2007), arXiv:0705.1865
Thomas Vojta and Joerg Schmalian, Percolation Quantum Phase Transitions in Diluted Magnets, Phys. Rev. Lett. 95, 237206 (2005), cond-mat/0508211
Thomas Vojta, Disorder-Induced Rounding of Certain Quantum Phase Transitions, Phys. Rev. Lett. 90, 107202 (2003), cond-mat/0212305
SUPERCONDUCTORS AND SUPERFLUIDS
Fawaz Hrahsheh and Thomas Vojta, Disordered bosons in one dimension: from weak to strong randomness criticality, Phys. Rev. Lett. 109, 265303 (2012), arXiv:1210.4807
Priyanka Mohan, Paul M. Goldbart, Rajesh Narayanan, John Toner and Thomas Vojta, An anomalously elastic, intermediate phase in randomly layered superfluids, superconductors, and planar magnets, Phys. Rev. Lett. 105, 085301 (2010), arXiv:1003.5201
Matthias Vojta, Thomas Vojta and Ribhu K. Kaul, Spin Excitations in Fluctuating Stripe Phases of Doped Cuprate Superconductors, Phys. Rev. Lett. 97, 097001 (2006), cond-mat/0510448
NONEQUILIBRIUM TRANSITIONS
Thomas Vojta and Jose A Hoyos, Infinite-noise criticality: Nonequilibrium phase transitions in fluctuating environments, Europhys. Lett. 112, 30002 (2015), arXiv:1507.05677
Hatem Barghathi and Thomas Vojta, Random fields at a nonequilibrium phase transition, Phys. Rev. Lett. 109, 170603 (2012), arXiv:1206.1878
Thomas Vojta, Adam Farquhar and Jason Mast, Infinite-randomness critical point in the two-dimensional disordered contact process, Phys. Rev. E 79, 011111 (2009), arXiv:0810.1569
Thomas Vojta and Man Young Lee, Nonequilibrium Phase Transition on a Randomly Diluted Lattice, Phys. Rev. Lett. 96, 035701 (2006), cond-mat/0511065


 Selected Talks online

How random is topological disorder? Phase transitions and localization on random lattices
Conference on Frontiers of quantum and mesoscopic thermodynamics, Prague, July 2015
Quantum phase transitions and novel phases in condensed matter
Colloquium given at UFMG Belo Horizonte, Brazil, April 2015
Quantum phase transitions and disorder: Griffiths singularities, infinite randomness and smearing
Seminar talk given at the University of Minnesota, October 2014
Anomalously elastic phase in randomly layered superfluids, superconductors, and planar magnets
Conference on Frontiers of quantum and mesoscopic thermodynamics, Prague, August 2011
Infinite-randomness quantum critical points induced by dissipation
Conference on Quantum Criticality and Novel Phases, Dresden, August 2009
Quantum phase transitions on percolating lattices
APCTP Winter Workshop on Emergent phenomena near quantum critical points, Pohang, Korea, Feb 2007
Quantum Griffiths effects in itinerant Heisenberg Magnets
Short talk given at the 2005 APS March Meeting in Los Angeles
Rare region effects at a nonequilibrium phase transition
Short talk given at the 2005 APS March Meeting in Los Angeles
Itinerant ferromagnetic quantum phase transition
Talk given at the ICAM Meeting on Quantum Criticality in Correlated Matter, New York, March 2003
Disorder-induced rounding of certain quantum phase transitions
Short talk given at the 2003 APS March Meeting in Austin