A5024798344- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Quantum Electrodynamics and Casimir Effect
- Topological Materials and Phenomena
- Superconducting Materials and Applications
- Noncommutative and Quantum Gravity Theories
- Relativity and Gravitational Theory
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Mechanics and Applications
- Quantum many-body systems
- High-pressure geophysics and materials
- Rare-earth and actinide compounds
- Graphene research and applications
- Particle physics theoretical and experimental studies
- Quantum and electron transport phenomena
- Spacecraft and Cryogenic Technologies
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Advanced Condensed Matter Physics
- Quantum Chromodynamics and Particle Interactions
- Solar and Space Plasma Dynamics
Landau Institute for Theoretical Physics
2016-2025
Aalto University
2016-2025
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2016-2025
Karlsruhe Institute of Technology
2017-2022
University of Technology
2007-2018
KTH Royal Institute of Technology
2015
Russian Academy of Sciences
2008-2014
Helsinki Institute of Physics
1999-2010
Tampere University of Applied Sciences
1992-2008
Centre National de la Recherche Scientifique
1992-1997
The first measurements on vortices in rotating superfluid $^{3}\mathrm{He}$ have been conducted the Low Temperature Laboratory at Helsinki University of Technology during past five years. These experiments revealed unique vortex phenomena that are not observed any other known superfluids. In this review, concept broken symmetry is applied to investigate quantized lines $^{3}\mathrm{He}$. $A$ phase, vorticity can be supported by a continuous winding order parameter; gives rise "coreless" with...
We show that the topologically protected flat band emerging on a surface of nodal fermionic system promotes superconductivity due to an infinitely large density states associated with band. The critical temperature depends linearly pairing interaction and can be thus considerably higher than exponentially small bulk temperature. discuss example in multilayered graphene rhombohedral stacking.
The paradox of linear momentum in ferromagnetics is explained terms the exchange between coherent and incoherent degrees freedom condensed matter.
The quantum tunneling processes related to the black hole determine thermodynamics. Hawking temperature is determined by of radiation particles from hole. On other hand, Bekenstein–Hawking entropy obtained consideration macroscopic splitting smaller holes. These also composition rule for entropy, which coincides with non-extensive Tsallis–Cirto δ = 2 entropy. This suggests that mass spectrum equidistant, M NM 0 . Here N an integer number and $$\sqrt $$ m P expressed via reduced Planck S BH ( )
Rotating superfluid $^{3}\mathrm{He}$-$B$ is found to possess a new contribution the NMR frequency shift, which changes sign on reversal of either angular velocity rotation or magnetic field. For $p=29.3$ bars this gyromagnetic effect shows discontinuity in magnitude at first-order phase-transition temperature $\frac{T}{{T}_{c}}=0.6$, change vortex-core structure takes place. These observations support conclusion that vortex core possesses spontaneous intrinsic magnetization.
It is shown that there may exist five axisymmetric vortices in $^{3}\mathrm{He}$-$B$, different their internal symmetries. The Landau theory for phase transitions between them constructed. Numerical calculations show one of the observed possesses a novel new structure: superfluid core, which ferromagnetic. This explains measured large magnetic moment vortex.
The topological Chern-Simons term with the parameter theta =n pi exists in superfluid 3He-A thin film, where an integer n may be odd or even depending on thickness of film. particle like soliton film (so-called skyrmion) charge Q has spin s=nQh(cross)/2 and obeys Fermi-Dirac quantum statistics at n. action leads to specific quantised Hall effect for current 3He-A. In planar phase 3He non-singular 4 disclination fractional fermion 1/2n which corresponds electric 1/2en state superconductor....
This paper reports the discovery of a new breaking symmetry quantized vortex lines in superfluid $^{3}\mathit{B}$: Vortices with broken axisymmetry are found energetically more favorable than any axisymmetric ones weak-coupling limit. Based on our extensive numerical minimization free-energy functional, we identify vortices occurring rotating $^{3}\mathit{B}$ at low pressures as v having---in addition to space parity P---also Q nonaxisymmetry quantum number...
Different types of Lifshitz transitions are governed by topology in momentum space. They involve the topological with change Fermi surfaces, Weyl and Dirac points, nodal ines, also between fully gapped states.
One of the most sought-after objects in topological quantum-matter systems is a vortex carrying half quantum circulation. They were originally predicted to exist superfluid He3−A but have never been resolved there. Here we report an observation half-quantum vortices (HQVs) polar phase He3. The are created with rotation or by Kibble-Zurek mechanism and identified based on their nuclear magnetic resonance signature. This discovery provides pathway for studies unpaired Majorana modes bound HQV...
We consider the Z2 topology of Dirac lines, i.e., lines band contacts, on an example graphite. Four lines—three with topological charge each and one —merge together near H-point annihilate due to summation law . The merging point is similar real-space nexus, analog monopole at which strings terminate.
We discuss the consequences of unique symmetry de Sitter spacetime. This leads to specific thermodynamic properties vacuum, which produces a thermal bath for matter. spacetime is invariant under modified translations, r→r−eHta, where H Hubble parameter. For H→0, this corresponds conventional invariance Minkowski translations r→r−a. Due symmetry, all comoving observers at any point space perceive environment as with temperature T=H/π, twice large Gibbons–Hawking cosmological horizon. does not...
The first realization of instabilities in the shear flow between two superfluids is examined. interface separating A and B phases superfluid 3He magnetically stabilized. With uniform rotation we create a state with discontinuous tangential velocities at interface, supported by difference quantized vorticity phases. This remains stable nondissipative to high relative velocities, but finally undergoes an instability when interfacial mode excited some vortices cross phase boundary. measured...