Associate Professor
Office address: Room8S02, Natural Science Building A
Department of Physics, Renmin University of China
E-mail: nhtong@ruc.edu.cn
Educational Background:
1997.9-2002.7
Ph. D. Candidate
Institute of Physics, Chinese Academy of Sciences (CAS)
Theoretical Physics
1993.9-1997.7
Undergraduate student
Department of Material Science, Fudan University, Shanghai
Electronic material
Research Experience:
2002.8-2003.1: Post-doctor; University of Augsburg
2003.2-2004.10: Research Fellow of the Alexander von Humboldt
Foundation; Theoretical Physics III, University of Augsburg
2004.11- 2005.12: Post-doctor; University of Karlsruhe
Research Interests:
1.Quantum impurity problems with fermionic bath or bosonic bath. Numerical renormalization group can be used to disclose the rich physics in these systems. These problems include the impurity near the quantum critical point, the impurity imbedded in correlated environment, boundary field theory and boundary phase transition, the behavior of qubit under dissipation, and the dissipation effect on electron transport through quantum dots.
2.Correlation induced localization effect, the Mott transition in transition metal oxides such as V2O3, organic materials, and optical lattices, etc. Study the effect of orbitals and phonons on the Mott transition in the transition metal oxides.
Phase separation, striped phase, and the intrinsic charge inhomogeneity in the doped manganite and cooperate materials. Investigating their physical mechanism and the essential relationship between phase separation and the special properties of the materials, such as CMR and High Tc superconductivity.
3.I am also interested in the diversity of symmetry breaking in the transition metal oxides where charge, spin and orbital degrees of freedom are all involved. Examples of such systems are the Fe oxides and the doped manganite oxides. Investigate the complex interplay between different channels and find the mechanism that can stablize the specific long-range-ordered state observed in experiment.
4.The manifest of quantum critical point in condensed materials. Special physical behavior, such as non-Fermi-liquid behavior and power law behavior, can be found in systems near quantum critical point. Study the relationship between such behavior observed in real materials (such as heavy fermion system and high Tc superconductor) and the possible existence of certain quantum critical points. Study the properties of quantum critical point in certain theoretical models.
5.New development of numerical methods such as the exact diagonalization, numerical renormalization group, and quantum Monte Carlo. Develop them to overcome their respective shortcomings and limitations, and apply them to more extensive physical fields. Examples are extending the quantum Monte Carlo to lower temperatures, and extending the numerical renormalization group to non-equilibrium systems.
Selected Publications:
1. Ning-Hua Tong and Matthias Vojta
cond-mat/0512315.
Signatures of a Noise-Induced Quantum Phase Transition in a Mesoscopic Metal Ring
2. Sabine Tornow, Ning-Hua Tong, Ralf Bulla
cond-mat/0502276.
Electron Transfer in Donor-Acceptor Systems: Many-Particle Effects and Influence of Electron Correlations
3. Ning-Hua Tong
Phys. Rev. B 72, 115104 (2005).
Extended Variational Cluster Approximation for Correlated Systems
4. Matthias Vojta, Ning-Hua Tong, Ralf Bulla
Phys. Rev. Lett. 94, 070604 (2005)
Quantum Phase Transitions in the sub-Ohmic Spin-Boson Model: Failure of the Quantum-Classical Mapping
5. Ralf Bulla, Hyun-Jung Lee, Ning-Hua Tong, and Matthias Vojta
Phys. Rev. B 71, 045122 (2005)
Numerical renormalization Group for Quantum Impurities in a Bosonic Bath
6. Ning-Hua Tong, Shun-Qing Shen, and Ralf Bulla
Phys. Rev. B 70, 085118 (2004)
Charge Ordering and Phase Separation in Infinite Dimensional Extended Hubbard Model
7. Robert Zitzler, Ning-Hua Tong, Thomas Pruschke, and Ralf Bulla
Phys. Rev. Lett. 93, 016406 (2004)
Phase Diagram of the Frustrated Hubbard Model
8. Ralf Bulla, Ning-Hua Tong, and Matthias Vojta
Phys. Rev. Lett. 91, 170601 (2003)
Numerical Renormalization Group for Bosonic Systems and Application to the Sub-Ohmic Spin-Boson Model
9. Fan Yang, Ru-Shan Han, and Ning-Hua Tong
Chinese Phys. Lett. 19, 1336 (2002)
Electronic structure properties and superconductivity of diborides in the MgB2 structure
10. Ning-Hua Tong
Commun. Theor. Phys. 37, 615 (2002)
Influence of doping on the Mott metal-insulator transition in infinite dimensions
11. Ning-Hua Tong and Shun-Qing Shen
Mod. Phys. Lett. B 15, 1249 (2001)
Low temperature properties of Mott-Hubbard transition
12. Ning-Hua Tong, Shun-Qing Shen, and Fu-Cho Pu
Phys. Rev. B 64, 235109 (2001)
Mott-Hubbard transition in infinite dimensions
13. Ning-Hua Tong, Fu-Cho Pu
Phys. Rev. B 62, 9425 (2000)
Fine structure of phase separation in double-exchange systems
