Theory of Cold Atoms @ Seoul National University

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About Our Group

Quantum many-body physics investigates the complex and highly entangled behavior of interacting (elementary or composite) particles at ultralow temperatures. Our group explores the intricate and unexpected manifestations of the resulting emergent phenomena when many quantum degrees of freedom cooperate, which go fundamentally beyond those expected from the simple single-particle picture familiar from textbook scenarios.

Here is a Promotional Video on Youtube

Selected Publications

Impact of trans-Planckian excitations on black-hole radiation in dipolar condensates
Caio C. Holanda Ribeiro and Uwe R. Fischer
Phys. Rev. D 107, L121502 (Letter) (2023).
Number-conserving solution for dynamical quantum backreaction in a Bose-Einstein condensate
Sang-Shin Baak, Caio C. Holanda Ribeiro, and Uwe R. Fischer
Phys. Rev. A 106, 053319 (2022).
Probing the Scale Invariance of the Inflationary Power Spectrum in Expanding Quasi-Two-Dimensional Dipolar Condensates
Seok-Yeong Chä and Uwe R. Fischer
Phys. Rev. Lett. 118, 130404 (2017).
"Photonic" Cat States from Strongly Interacting Matter Waves
Uwe R. Fischer and Myung-Kyun Kang
Phys. Rev. Lett. 115, 260404 (2015).
Revealing Single-Trap Condensate Fragmentation by Measuring Density-Density Correlations after Time of Flight
Myung-Kyun Kang and Uwe R. Fischer
Phys. Rev. Lett. 113, 140404 (2014).
Ultrafast quantum random access memory utilizing single Rydberg atoms in a Bose-Einstein condensate
Kelly R. Patton and Uwe R. Fischer
Phys. Rev. Lett. 111, 240504 (2013).
Fragmented many-body ground states for scalar bosons in a single trap
Philipp Bader and Uwe R. Fischer
Phys. Rev. Lett. 103, 060402 (2009).
Vortex quantum creation and winding number scaling in a quenched spinor Bose gas
Michael Uhlmann, Ralf Schützhold, and Uwe R. Fischer
Phys. Rev. Lett. 99, 120407 (2007).
Sweeping from the superfluid to the Mott phase in the Bose-Hubbard model
Ralf Schützhold, Michael Uhlmann, Yan Xu, and Uwe R. Fischer
Phys. Rev. Lett. 97, 200601 (2006).
Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions
Uwe R. Fischer
Phys. Rev. A 73, 031602 (Rapid Communication) (2006).
Quantum simulation of cosmic inflation in two-component Bose-Einstein condensates
Uwe R. Fischer and Ralf Schützhold
Phys. Rev. A 70, 063615 (2004).
"Cosmological" quasiparticle production in harmonically trapped superfluid gases
Petr O. Fedichev and Uwe R. Fischer
Phys. Rev. A 69, 033602 (2004).
Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas
Petr O. Fedichev and Uwe R. Fischer
Phys. Rev. Lett. 91, 240407 (2003).
Vortex states of rapidly rotating dilute Bose-Einstein condensates
Uwe R. Fischer and Gordon Baym
Phys. Rev. Lett. 90, 140402 (2003).
Existence of Long-Range Order for Trapped Interacting Bosons
Uwe R. Fischer
Phys. Rev. Lett. 89, 280402 (2002).

Members

Professor, Principal Investigator

Postdocs

Satadal Datta
Analogue Gravity
56-519
Kunal Pal
Analogue Gravity
56-519

Graduate Students

박재균 (Jae-Gyun Baak)
Quantum Metrology
56-520
양승준 (Seung-Joon Yang)
Analogue Gravity
56-517
김선우 (Sunwoo Kim)
Quantum Metrology
56-517

Alumni

Postdocs

Graduate Students

김주연 (Ju-Yeon Gyhm)
Quantum Batteries and Quantum Metrology
박상신 (Sang-Shin Baak)
Analogue Gravity
신성호 (Seong-Ho Shinn)
Spinor Bose-Einstein Condensates
곽영진 (YeongJin Gwak)
Self-Consistent Quantum Many-Body Physics
최석영 (Seok-Yeong Chä)
Analogue Quantum Cosmology
BK Thesis Excellence Award 2018
Now Senior Research Engineer at LG Display
강명균 (Myung-Kyun Kang)
Measurement Theory of Quantum Many-Body States
BK Thesis Excellence Award 2016
Now at InBody

Undergraduate Students

우승범 (Seung-Bum Woo)
Quantum Computing
노경주 (Kyung-Joo Noh)
Open Systems and Quantum Error Correction

Research Interests

Analogue Gravity: Simulating Quantum Fields in Curved Spacetime

A variety of cosmologically motivated effective quasiparticle space-times can be produced in harmonically trapped superfluid Bose and Fermi gases. We have studied the analog of cosmological particle production in these effective space-times, induced by trapping potentials and coupling constants possessing an arbitrary time dependence. The WKB probabilities for phonon creation from the superfluid vacuum have been calculated, and an experimental procedure to detect quasiparticle production by measuring density-density correlation functions was proposed.
[Related Publications]
Seok-Yeong Chä and Uwe R. Fischer, Probing the Scale Invariance of the Inflationary Power Spectrum in Expanding Quasi-Two-Dimensional Dipolar Condensates, Phys. Rev. Lett. 118, 130404 (2017).
(See also Science Dong-a (과학동아) Article 기체 방울 속에 우주와 블랙홀을 재현하다. )
Uwe R. Fischer and Ralf Schützhold, Quantum simulation of cosmic inflation in two-component Bose-Einstein condensates, Phys. Rev. A 70, 063615 (2004).
Petr O. Fedichev and Uwe R. Fischer, “Cosmological” quasiparticle production in harmonically trapped superfluid gases, Phys. Rev. A 69, 033602 (2004).
Petr O. Fedichev and Uwe R. Fischer, Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas, Phys. Rev. Lett. 91, 240407 (2003).

Quantum Metrology: Harnessing Many-Body Correlations

Quantum metrology aims to describe the potentially enhanced usefulness of quantum systems over classical systems to carry out precise measurements of important physical quantities. To this end, the quantum Cramér-Rao theorem along with the Quantum Fisher Information contained in it gives an ultimate bound on the precision of the estimation of any classical parameter. In a quantum estimation framework, many-body physics can play a very valuable role. Indeed, many-body correlations are a useful resource for quantum metrology. Using our expertise on many-body physics, and on dilute ultracold gases in particular, we aim to better understand the role of interactions in metrology. On the other hand, we also study relativistic quantum metrology. By combining general relativity and quantum parameter estimation, we can find the estimation precision of parameters like the speed of light, curvature, Schwarzschild radius, etc.
[Related Publications]
Daniel Braun, Fabienne Schneiter, and Uwe R. Fischer, Intrinsic measurement errors for the speed of light in vacuum, Class. Quantum Grav. 34, 175009 (2017).
T. J. Volkoff and Uwe R. Fischer, Amplification of the quantum superposition macroscopicity of a flux qubit by a magnetized Bose gas, Phys. Rev. A 94, 042320 (2016).

Fragmentation of Bosonic Condensates as a Many-Body Phenomenon

We investigate whether the many-body ground states of bosons in a generalized two-mode model with localized inhomogeneous single-particle orbitals and anisotropic long-range interactions (e.g., dipole-dipole interactions) are coherent or fragmented. It is demonstrated that fragmentation can take place in a single trap for positive values of the interaction couplings, implying that the system is potentially stable. Furthermore, the degree of fragmentation is shown to be insensitive to small perturbations on the single-particle level.
[Related Publications]
Uwe R. Fischer and Myung-Kyun Kang, "Photonic" Cat States from Strongly Interacting Matter Waves, Phys. Rev. Lett. 115, 260404 (2015).
Myung-Kyun Kang and Uwe R. Fischer, Revealing Single-Trap Condensate Fragmentation by Measuring Density-Density Correlations after Time of Flight, Phys. Rev. Lett. 113, 140404 (2014).
Uwe R. Fischer and Bo Xiong, Robustness of fragmented condensate many-body states for continuous distribution amplitudes in Fock space, Phys. Rev. A 88, 053602 (2013).
Philipp Bader and Uwe R. Fischer, Fragmented Many-Body Ground States for Scalar Bosons in a Single Trap, Phys. Rev. Lett. 103, 060402 (2009).

Hybrid Quantum Systems

We have established a long-lived and rapidly accessible quantum memory unit (quantum RAM) in a hybrid system. The operational Hilbert space is spanned by states involving the two macroscopically occupied hyperfine levels of a miscible binary atomic Bose-Einstein condensate and the Rydberg state of a single atom therein, which interacts magnetically with the flux qubit of a SQUID. An arbitrary qubit state, initially prepared using the flux qubit, can be rapidly transferred to and from the trapped atomic ensemble in approximately 10 ns and with a large fidelity of 97%, via an effective two-photon process using an external laser for the transition to the Rydberg level. The achievable ultrafast transfer of quantum information enables a large number of storage and retrieval cycles from the highly controllable quantum optics setup of a dilute ultracold gas, even within the typically very short flux qubit lifetimes of the order of microseconds.
[Related Publications]
Kelly R. Patton and Uwe R. Fischer, Ultrafast Quantum Random Access Memory Utilizing Single Rydberg Atoms in a Bose-Einstein Condensate, Phys. Rev. Lett. 111, 024504 (2013).
Kelly R. Patton and Uwe R. Fischer, Hybrid of superconducting quantum interference device and atomic Bose-Einstein condensate: An architecture for quantum information processing, Phys. Rev. A 87, 052303 (2013).
Kelly R. Patton and Uwe R. Fischer, Transfer and storage of qubits in the presence of decoherence, EPL 102, 20001 (2013).

Publications

2024

Beneficial and detrimental entanglement for quantum battery charging
Ju-Yeon Gyhm and Uwe R. Fischer
AVS Quantum Sci. 6, 012001 (2024).

2023

Self-consistent many-body metrology
Jae-Gyun Baak, Uwe R. Fischer
arXiv:2310.02580v1 [quant-ph] (2023).
Petrov classification of analogue spacetimes
Sang-Shin Baak, Satadal Datta, and Uwe R. Fischer
Class. Quantum Grav. 40, 215001 (2023).
Impact of trans-Planckian excitations on black-hole radiation in dipolar condensates
Caio C. Holanda Ribeiro and Uwe R. Fischer
Phys. Rev. D 107, L121502 (Letter) (2023).
Dispersive censor of acoustic spacetimes with a shock-wave singularity
Uwe R. Fischer and Satadal Datta
Phys. Rev. D 107, 084023 (2023).
Nonlocal field theory of quasiparticle scattering in dipolar Bose-Einstein condensates
Caio C. Holanda Ribeiro and Uwe R. Fischer
SciPost Phys. Core 6, 003 (2023).

2022

Quantum metrology with ultracold chemical reactions
Seong-Ho Shinn, Uwe R. Fischer, and Daniel Braun
arXiv:2208.06380v1 [cond-mat.quant-gas] (2022).
Classical and quantum metrology of the Lieb-Liniger model
Jae-Gyun Baak and Uwe R. Fischer
Phys. Rev. A 106, 062442 (2022).
Number-conserving solution for dynamical quantum backreaction in a Bose-Einstein condensate
Sang-Shin Baak, Caio C. Holanda Ribeiro, and Uwe R. Fischer
Phys. Rev. A 106, 053319 (2022).
Existence of steady-state black hole analogs in finite quasi-one-dimensional Bose-Einstein condensates
Caio C. Holanda Ribeiro, Sang-Shin Baak, and Uwe R. Fischer
Phys. Rev. D 105, 124066 (2022).
Analogue gravitational field from nonlinear fluid dynamics
Satadal Datta and Uwe R. Fischer
Class. Quantum Grav. 39, 075018 (2022).
Testing the upper bound on the speed of scrambling with an analogue of Hawking radiation using trapped ions
Zehua Tian, Yiheng Lin, Uwe R. Fischer, and Jiangfeng Du
Eur. Phys. J. C 82, 212 (2022).
Inherent nonlinearity of fluid motion and acoustic gravitational wave memory
Satadal Datta and Uwe R. Fischer
Phys. Rev. D 105, 022003 (2022).

2021

Benchmarking the multiconfigurational Hartree method by the exact wavefunction of two harmonically trapped bosons with contact interaction
Yeongjin Gwak, Oleksandr V. Marchukov, and Uwe R. Fischer
Ann. Phys. (N. Y.) 434, 168592 (2021).

2020

Stoner-Wohlfarth switching of the condensate magnetization in a dipolar spinor gas and the metrology of excitation damping
Seong-Ho Shinn, Daniel Braun, and Uwe R. Fischer
Phys. Rev. A 102, 013315 (2020).

2019

Self-consistent determination of the many-body state of ultracold bosonic atoms in a one-dimensional harmonic trap
Oleksandr V. Marchukov and Uwe R. Fischer
Ann. Phys. (N. Y.) 405, 274 (2019).
Exact surface-wave spectrum of a dilute quantum liquid
Peter V. Pikhitsa and Uwe R. Fischer
Phys. Rev. B 99, 184504 (2019).
Many-body quantum metrology with scalar bosons in a single potential well
Julien M. E. Fraïsse, Jae-Gyun Baak, and Uwe R. Fischer
Phys. Rev. A 99, 043618 (2019).

2018

Mesoscopics of half-quantum vortex pair deconfinement in a trapped spin-one condensate
Seong-Ho Shinn and Uwe R. Fischer
Phys. Rev. A 98, 053602 (2018).
Implementation-independent sufficient condition of the Knill-Laflamme type for the autonomous protection of logical qudits by strong engineered dissipation
Jae-Mo Lihm, Kyungjoo Noh, and Uwe R. Fischer
Phys. Rev. A 98, 012317 (2018).
Roton entanglement in quenched dipolar Bose-Einstein condensates
Zehua Tian, Seok-Yeong Chä, and Uwe R. Fischer
Phys. Rev. A 97, 063611 (2018).

2017

Intrinsic measurement errors for the speed of light in vacuum
Daniel Braun, Fabienne Schneiter, and Uwe R. Fischer
Class. Quantum Grav. 34, 175009 (2017).
Probing the Scale Invariance of the Inflationary Power Spectrum in Expanding Quasi-Two-Dimensional Dipolar Condensates
Seok-Yeong Chä and Uwe R. Fischer
Phys. Rev. Lett. 118, 130404 (2017).

2016

Amplification of the quantum superposition macroscopicity of a flux qubit by a magnetized Bose gas
T. J. Volkoff and Uwe R. Fischer
Phys. Rev. A 94, 042320 (2016).
Quantum sine-Gordon dynamics on analogue curved spacetime in a weakly imperfect scalar Bose gas
T. J. Volkoff and Uwe R. Fischer
Phys. Rev. D 94, 024051 (2016).

2015

"Photonic" Cat States from Strongly Interacting Matter Waves
Uwe R. Fischer and Myung-Kyun Kang
Phys. Rev. Lett. 115, 260404 (2015).
Condensate fragmentation as a sensitive measure of the quantum many-body behavior of bosons with long-range interactions
Uwe R. Fischer, Axel U. J. Lode, and Budhaditya Chatterjee
Phys. Rev. A 91, 063621 (2015).

2014

Consistent perturbative treatment of the subohmic spin-boson model yielding arbitrarily small $T_2/T_1$ decoherence time ratios
Kyung-Joo Noh and Uwe R. Fischer
Phys. Rev. B 90, 220302 (Rapid Communication) (2014).
Revealing Single-Trap Condensate Fragmentation by Measuring Density-Density Correlations after Time of Flight
Myung-Kyun Kang and Uwe R. Fischer
Phys. Rev. Lett. 113, 140404 (2014).
Universality of the Berezinskii–Kosterlitz–Thouless type of phase transition in the dipolar XY-model
A. Yu. Vasiliev, A. E. Tarkhov, L. I. Menshikov, P. O. Fedichev, and Uwe R. Fischer
New J. Phys. 16, 053011 (2014).
Truncated many-body dynamics of interacting bosons: A variational principle with error monitoring
Kang-Soo Lee and Uwe R. Fischer
Int. J. Mod. Phys. B 28, 1550021 (2014).

2013

Ultrafast quantum random access memory utilizing single Rydberg atoms in a Bose-Einstein condensate
Kelly R. Patton and Uwe R. Fischer
Phys. Rev. Lett. 111, 024504 (2013).
Robustness of fragmented condensate many-body states for continuous distribution amplitudes in Fock space
Uwe R. Fischer and Bo Xiong
Phys. Rev. A 88, 053602 (2013).
Transfer and storage of qubits in the presence of decoherence
Kelly R. Patton and Uwe R. Fischer
EPL 102, 20001 (2013).
Interaction-induced coherence among polar bosons stored in triple-well potentials
Bo Xiong and Uwe R. Fischer
Phys. Rev. A 88, 063608 (2013).
Stability of spherically trapped three-dimensional Bose-Einstein condensates against macroscopic fragmentation
Philipp Bader and Uwe R. Fischer
Phys. Rev. A 87, 023632 (2013).
Hybrid of superconducting quantum interference device and atomic Bose-Einstein condensate: An architecture for quantum information processing
Kelly R. Patton and Uwe R. Fischer
Phys. Rev. A 87, 052303 (2013).

2012

Verifying the observer dependence of quasiparticle counts in the analogue gravity of dilute ultracold quantum gases
Uwe R. Fischer
arXiv:1205.5548 [cond-mat.quant-gas] (2012).
Identifying strongly correlated supersolid states on the optical lattice by quench-induced $\pi$-states
Uwe R. Fischer and Bo Xiong
EPL 99, 66003 (2012).

2011

Many-site coherence revivals in the extended Bose-Hubbard model and the Gutzwiller approximation
Uwe R. Fischer and Bo Xiong
Phys. Rev. A 84, 063635 (2011).
Emergence of a new pair-coherent phase in many-body quenches of repulsive bosons
Uwe R. Fischer, Kang-Soo Lee, and Bo Xiong
Phys. Rev. A 84, 011604 (Rapid Communication) (2011).

2010

System size scaling of topological defect creation in a second-order dynamical quantum phase transition
Michael Uhlmann, Ralf Schützhold, and Uwe R. Fischer
New J. Phys. 12, 095020 (2010).
Interacting trapped bosons yield fragmented condensate states in low dimensions
Uwe R. Fischer and Philipp Bader
Phys. Rev. A 82, 013607 (2010).
Increased Cation Conductance in Human Erythrocytes Artificially Aged by Glycation
Yuliya V. Kucherenko, Shefalee K. Bhavsar, Valentin I. Grischenko, Uwe R. Fischer, Stephan M. Huber, and Florian Lang
J. Membrane Biol. 235, 177-189 (2010).
$O(N)$ symmetry-breaking quantum quench: Topological defects versus quasiparticles
Michael Uhlmann, Ralf Schützhold, and Uwe R. Fischer
Phys. Rev. D 81, 025017 (2010).

2009

Fragmented many-body ground states for scalar bosons in a single trap
Philipp Bader and Uwe R. Fischer
Phys. Rev. Lett. 103, 060402 (2009).

Before 2009

2008

Tunneling-induced damping of phase coherence revivals in deep optical lattices
Uwe R. Fischer and Ralf Schützhold
Phys. Rev. A 78, 061603 (Rapid Communication) (2008).
Effect of fluctuations on the superfluid-supersolid phase transition on the lattice
Ralf Schützhold, Michael Uhlmann, and Uwe R. Fischer
Phys. Rev. A 78, 033604 (2008).
Bogoliubov theory of quantum correlations in the time-dependent Bose-Hubbard model
Uwe R. Fischer, Ralf Schützhold, and Michael Uhlmann
Phys. Rev. A 77, 043615 (2008).
Coherent single atom shuttle between two Bose-Einstein condensates
Uwe R. Fischer, Christian Iniotakis, and Anna Posazhennikova
Phys. Rev. A 77, 031602 (Rapid Communication) (2008).

2007

Vortex quantum creation and winding number scaling in a quenched spinor Bose gas
Michael Uhlmann, Ralf Schützhold, and Uwe R. Fischer
Phys. Rev. Lett. 99, 120407 (2007).
Quantum top inside a Bose-Einstein-condensate Josephson junction
Ingrid Bausmerth, Uwe R. Fischer, and Anna Posazhennikova
Phys. Rev. A 75, 053605 (2007).
Dynamical Aspects of Analogue Gravity: The Backreaction of Quantum Fluctuations in Dilute Bose-Einstein Condensates
Uwe R. Fischer
Lect. Notes Phys. 718, 93-113 (2007).

2006

Global singularity-free solution of the Iordanskiĭ force problem
Markus Flaig and Uwe R. Fischer
Phys. Rev. B 74, 224503 (2006).
Sweeping from the superfluid to the Mott phase in the Bose-Hubbard model
Ralf Schützhold, Michael Uhlmann, Yan Xu, and Uwe R. Fischer
Phys. Rev. Lett. 97, 200601 (2006).
Mean-field expansion in Bose-Einstein condensates with finite-range interactions
Ralf Schützhold, Michael Uhlmann, Yan Xu, and Uwe R. Fischer
Int. J. Mod. Phys. B 20, 3555-3565 (2006).
Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions
Uwe R. Fischer
Phys. Rev. A 73, 031602 (Rapid Communication) (2006).

2005

Quantum backreaction in dilute Bose-Einstein condensates
Ralf Schützhold, Michael Uhlmann, Yan Xu, and Uwe R. Fischer
Phys. Rev. D 72, 105005 (2005).
Reply to Comment on "Dynamical role of anyonic excitation statistics in rapidly rotating Bose gases"
Uwe R. Fischer
Phys. Rev. Lett. 94, 208904 (2005).
Maximal length of trappped one-dimensional Bose-Einstein condensates
Uwe R. Fischer
J. Low Temp. Phys. 138, 723-728 (2005).

2004

Quantum simulation of cosmic inflation in two-component Bose-Einstein condensates
Uwe R. Fischer and Ralf Schützhold
Phys. Rev. A 70, 063615 (2004).
Dynamical role of anyonic excitation statistics in rapidly rotating Bose gases
Uwe R. Fischer
Phys. Rev. Lett. 93, 160403 (2004).
Quasiparticle universes in Bose-Einstein condensates
Uwe R. Fischer
Mod. Phys. Lett. A 19, 1789-1812 (2004).
"Cosmological" quasiparticle production in harmonically trapped superfluid gases
Petr O. Fedichev and Uwe R. Fischer
Phys. Rev. A 69, 033602 (2004).
Observer dependence for the phonon content of the sound field living on the effective curved space-time background of a Bose-Einstein condensate
Petr O. Fedichev and Uwe R. Fischer
Phys. Rev. D 69, 064021 (2004).
Vortex liquids and vortex quantum Hall states in trapped rotating Bose gases
Uwe R. Fischer, Petr O. Fedichev, and Alessio Recati
J. Phys. B: At. Mol. Opt. Phys. 37, S301-S310 (2004).

2003

Zero-temperature damping of Bose-Einstein condensate oscillations by vortex-antivortex pair creation
Petr O. Fedichev, Uwe R. Fischer, and Alessio Recati
Phys. Rev. A 68, 011602 (Rapid Communication) (2003).
Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas
Petr O. Fedichev and Uwe R. Fischer
Phys. Rev. Lett. 91, 240407 (2003).
Warped space-time for phonons moving in a perfect nonrelativistic fluid
Uwe R. Fischer and Matt Visser
Europhys. Lett. 62, 1-7 (2003).
On the space-time curvature experienced by quasiparticle excitations in the Painlevé-Gullstrand effective geometry
Uwe R. Fischer and Matt Visser
Ann. Phys. (N.Y.) 304, 22-39 (2003).
Vortex states of rapidly rotating dilute Bose-Einstein condensates
Uwe R. Fischer and Gordon Baym
Phys. Rev. Lett. 90, 140402 (2003).

Before 2003

Existence of Long-Range Order for Trapped Interacting Bosons
Uwe R. Fischer
Phys. Rev. Lett. 89, 280402 (2002).
Riemannian geometry of irrotational vortex acoustics
Uwe R. Fischer and Matt Visser
Phys. Rev. Lett. 88, 110201 (2002).
Electromagnetomotive force fields in noninertial reference frames and accelerated superconducting quantum interferometers
Uwe R. Fischer, Christoph Häußler, Jörg Oppenländer, and Nils Schopohl
Phys. Rev. B 64, 214509 (2001).
Short wavelength spectrum and Hamiltonian stability of vortex rings
Uwe R. Fischer and Nils Schopohl
Phys. Rev. E 64, 016306 (2001).
Specific heat of the Kelvin modes in low temperature superfluid turbulence
Uwe R. Fischer
Phys. Rev. B 63, 212504 (2001).
Hall state quantization in a rotating frame
Uwe R. Fischer and Nils Schopohl
Europhys. Lett. 54, 502-507 (2001).
Thermal quasi-equilibrium states across Landau horizons in the effective gravity of superfluids
Uwe R. Fischer and Grigori E. Volovik
Int. J. Mod. Phys. D 10, 57-88 (2001).
Tunnelling of topological line defects in strongly coupled superfluids
Uwe R. Fischer
Ann. Phys. (Leipzig) 9, 523-570 (2000).
Motion of Quantized Vortices as Elementary Objects
Uwe R. Fischer
Ann. Phys. (N.Y.) 278, 62-85 (1999).
On the theory of vortex quantum tunnelling in the dense Bose superfluid helium II
Uwe R. Fischer
Physica B 255, 41-54 (1998).
Geometric Laws of Vortex Quantum Tunneling
Uwe R. Fischer
Phys. Rev. B 58, 105-108 (1998).
Massive Charged Strings in the Description of Vortex Ring Quantum Nucleation
Uwe R. Fischer
J. Low Temp. Phys. 110, 39-44 (1998).
Transition probabilities for a Rydberg atom in the field of a gravitational wave
Uwe R. Fischer
Class. Quantum Grav. 11, 463-474 (1994).