Mississippi State University - Department of Physics:

Atomic, Molecular and Optical Physics and Condensed Matter Physics

 
   
 

Dr. Jinwu Ye

 
 

Associate Professor of Physics
Department of Physics and Astronomy
Mississippi State University
Ph.D. Yale University
Office: 215 Hilbun Hall, Mississippi State University
Mississippi State, MS 39762-5167
Phone: +1 (662) 325-2926
E-mail: jy306@msstate.edu

I am a faculty member of Atomic, Molecular and Optical Physics group,and also Condensed Matter Physics Group.

Research Interests

Brief summary: Quantum phase transitions, High temperature superconductivity, Quantum Hall effect, Non-relativistic Quantum field theory, Quantum Antiferromagnets, Quantm spin glass, quantum optics in correlated quantum phases and Condensed matter physics of cavity photons. Non-equilibrium phenomena in both condensed matter and quantum optical systems. Novel quantum and classical phenomena due to the interplay among spin-orbit-couplings and interactions in both condensed matter and cold atom systems. Topological phases and orders, topological phase transitions.

Longer description: My interests are in the theory of condensed matter physics, especially in strongly correlated electron systems. The behavior of a single electron may be easily understood by quantum mechanics, but the cooperative behaviors of many strongly correlated electrons are very intricate and complex. It is well known that water has three different states ( or phases ) as solid, liquid and gas at different temperatures. There also exist lattice oscillations in solid, ripples in liquid and sound waves in gas. Lattice oscillations, ripples and sound waves are excitations above these states respectively. Strongly correlated electron systems may enter into novel states at very low temperatures which are close to the absolute zero temperature, there may also exist some exotic excitations above the novel states of matter. With the ever increasing advance of experimental techniques, these systems are discovered to show novel and highly interesting behaviors at low temperature. I am trying to understand the underlying mechanisms and identify the possible new kinds of states of matter hidden behind these observed novel phenomena. Although the classical mechanics works very well to describe the three different states of water, their excitations and the classical phase transitions between the three states, it breaks down at very low temperature, quantum mechanics manifests its dominance at low temperature. Due to the strong correlations between the electrons, the conventional weak-coupling perturbative calculations around non-interacting metallic state does not apply, the systems may regroup themselves and enter into completely new states of matter which may be dramatically different from the conventional metallic state. I am trying to develop fully quantum mechanical and strong-coupling approaches to understand different novel ground states, exotic excitations above them and the quantum phase transitions between these states. Any correct understandings should be able to explain the experimental discoveries and make new predictions to be tested by experiments. Some of the specific examples are: High Temperature Superconductivity, Superfluidity and Quantum Hall Effects. Some of Recent developments are on topological phasess, associated topological orders and topological phase transitions.

My Research is currently supported by NSF-DMR.

Prof. Ye's strength and style is interdisciplinary. He is continuing to explore new cutting edge ( cold or hot ) research directions. Two of Prof. Ye's most recent directions are:

(1) (Non)-equilibrium Strongly correlated quantum optics.

Prof. Ye initiated and has been working on a new emerging field called " strongly correlated quantum optics ". Conventional quantum optics study interactions between photons and atoms or molecules. However, Prof. Ye is studying interactions between photons and a whole quantum phase. This is an inter-disciplinary direction involving condensed matter physics, quantum optics, ultra-cold atomic physics and quantum information. New physical insights and new theoretical approaches are needed to explore many novel physics phenomena in such a new experimental regime called " strongly correlated quantum optics " regime. New and efficient ways of quantum information processing and communications are also expected in this regime. Prof.Ye's group is developing new theoretical approaches and physical insights, also in close contacts with leading experimental groups in US, Europe and in China. The experimental systems come from both condensed matter side and cold atom side. From condensed matter side are exciton superfluids in electron-hole bilayer systems, exciton-polariton systems, Bilayer quantum Hall systems subject to dissipations, superconducting qubits inside a micro-wave circuit QED. From the cold atom side are cold atoms inside an optical cavity.

Recent Publications along this direction

  1. Yu Yi-Xiang, Jinwu Ye and CunLing Zhang, Parity oscillations and photon correlation functions in the $ Z_2/U(1) $ Dicke model at a finite number of atoms or qubits, Phys. Rev. A 94, 023830 (2016) .
  2. Yu Yi-Xiang, Jinwu Ye, W.M. Liu, and CunLing Zhang, Photon Berry phases, Instantons, Schrodinger Cats with oscillating parities and crossover from $ U(1) $ to $ Z_2 $ limit in cavity QED systems, arXiv:1506.07030 .
  3. Yu Yi-Xiang, Jinwu Ye and W.M. Liu, Comments on "Controlling Discrete and Continuous Symmetries in Superradiant Phase Transitions with Circuit QED Systems, PRL, 112, 173601 (2014). " arXiv:1506.06382 .
  4. Yu Yi-Xiang, Jinwu Ye and W.M. Liu, Goldstone and Higgs modes of photons inside an cavity and their detections, Scientific Reports 3, 3476 ( 2013 ) .
  5. Jinwu Ye, Fadi Sun, Yi-Xiang Yu, Wuming Liu, Exciton correlations and input-output relations in non-equilibrium exciton superfluids Ann. Phys. 329 (2013), 51-72 .
  6. Jinwu Ye and CunLin Zhang, Super-radiance, Berry phase, Photon phase diffusion and Number squeezed state in the $ U(1) $ Dicke ( Tavis-Cummings ) model, Phys. Rev. A 84, 023840 (2011) .
  7. Ying Dong, Jinwu Ye and Han Pu, Multi-stability in an optomechanical system with two-component Bose-Einstein condensate, Phys. Rev. A 83, 031608(R) (2011) .
  8. Jinwu Ye, Quantum phases, transitions, metastable supersolid of excitons and its internal photon detection in electron-hole bilayer systems, Jour. of Low Temp. Phys. 158, 882 (2010) .
  9. T. Shi, Longhua Jiang and Jinwu Ye, Two mode entanglement from exciton condensate. Phys. Rev. B 81, 235402 (2010). .
  10. Jinwu Ye, T. Shi and Longhua Jiang, Superfluid as a powerful light source. Phys.Rev.Lett. 103, 177401 (2009).
  11. T.Shi, Longhua Jiang and Jinwu Ye, Quantum Radiations and exciton correlations from meta-stable exciton superfluids arXiv:0802.1065 .
  12. (2) Novel Quantum , topological Phases, phase transitions driven by interactions in various spin-orbit coupled systems.

    Recently the investigation and control of spin-orbit coupling (SOC) have become subjects of intensive research in both condensed matter and cold atom systems after the discovery of the topological insulators. In the condensed matter side, there are increasing number of new quantum materials with significant SOC, including several new 5d transition metal oxides, multiferroic materials, and heterostructures of transition metal systems. In the cold atom side, several experimental groups have successfully generated artificial magnetic fields and quantum spin Hall Hamiltonian for neutral cold atoms loaded in optical lattices. During the last several years, Prof. Ye's group has been conducting deep and systematical investigations on the interplay between SOC of spinor bosons or fermions and interactions, in continuum systems and also on various 2d and 3d lattice geometries which leads to a whole new class of quantum, topological and classical phenomena. The results and insights to be achieved should have important impacts in both sides.

Recent Publications along this direction

  1. Fadi Sun and Jinwu Ye, Topological depletions and sub-leading scalings across topological phase transitions, arXiv:1610.03171.
  2. Yu Yi-Xiang, Fadi, Sun, Jinwu Ye and Ningfang Song, High Chern number topological superfluids and new class of topological phase transitions of Rashba spin-orbit coupled fermions on a lattice, arXiv:1609.06554.
  3. Fadi Sun, Jinwu Ye, In-commensurate Skyrmion crystals, devil staircases and multi-fractals due to spin orbit coupling in a lattice system, arXiv:1603.00451 .
  4. Fadi Sun, Jinwu Ye, Wu-Ming Liu, Classification of magnons in Rotated Ferromagnetic Heisenberg model and their competing responses in transverse fields, Phys. Rev. B 94, 024409 ( 2016 ). .
  5. Fadi Sun, Jinwu Ye, Wu-Ming Liu, Hubbard model with Rashba or Dresselhaus spin-orbit coupling and Rotated Anti-ferromagnetic Heisenberg Model arXiv:1601.01642 .
  6. Fadi Sun, Jinwu Ye, Wu-Ming Liu, Quantum incommensurate Skyrmion crystals and Commensurate to In-commensurate transitions of cold atoms and materials with spin orbit couplings, arXiv:1502.05338 .
  7. Fadi Sun, Jinwu Ye, Wu-Ming Liu, Quantum magnetism of spinor bosons in optical lattices with synthetic non-Abelian gauge fields, Phys. Rev. A 92, 043609 ( 2015 ) .
  8. Shang-Shun Zhang, Jinwu Ye, Wu-Ming Liu, Itinerant spin density waves and Quantum Lifshitz transitions in repulsively interacting spin-orbit coupled Fermi gas, Phys. Rev. B 94, 115121 ( 2016 ). .
  9. Yu Yi-Xiang, Jinwu Ye and W.M. Liu, Coherence lengths in attractively interacting Fermi gases with spin-orbit coupling, Phys. Rev. A 90, 053603 (2014) .
  10. Fadi Sun, Xiao-Lu Yu, Jinwu Ye, Heng Fan, Wu-Ming Liu, Topological Quantum Phase Transition in a Synthetic Non-Abelian Gauge Potential , Scientific Reports 3, 2119 ( 2013 ) .
  11. Shang-Shun Zhang, Xiao-Lu Yu, Jinwu Ye, Wu-Ming Liu, Collective modes of spin-orbit coupled Fermi gases in the repulsive regime, Phys. Rev. A 87, 063623 (2013) .
  12. Yan Chen and Jinwu Ye, Quantum phases, Supersolids and quantum phase transitions of interacting bosons in frustrated lattices, Nucl. Phys. B 869 (2013), 242-281 .
  13. Jinwu Ye, Keye Zhang, Yan Li, Yan Chen, Weiping Zhang, Optical Bragg, atom Bragg and cavity QED detections of quantum phases and excitation spectra of ultracold atoms in bipartite and frustrated optical lattices, Ann. Phys. 328 (2013) 103-138 .
  14. Yan Chen and Jinwu Ye, Characterizing symmetry breaking patterns in a lattice by dual vortex degree of freedoms, Philos. Mag. 92 (2012) 4484-4491. .
  15. Yu Chen, Jinwu Ye, Quang Shan Tian, Classification of a supersolid: Trial wavefunctions, Symmetry breakings and Excitation spectra Jour. of Low Temp. Phys. 169, 149-168 (2012). .
  16. Jinwu Ye, J.M. Zhang, Wuming Liu, Keye Zhang, Yan Li and Weiping Zhang, Light Scattering of qunatum phases and excitation spectra of ultra-cold atoms in optical lattices. Phys. Rev. A 83, 051604(R) (2011) .
  17. Jinwu Ye, Duality, Magnetic space group and their applications to quantum phases and phase transitions on bipartite lattices in several experimental systems, Nucl. Phys.B 805 (3) 418-440 (2008).

I taught the following courses

(1) Undergraduate   Mechanics II, 461 (syllabus)
(2) Graduate   Quantum Theory of Solids I , 512 (syllabus)
(3) Graduate  Quamtum Theory of Solids II ( Many Body Physics ), 513 (syllabus)
(4) Graduate  Critical Phenomena and Field Theory, 518 (syllabus)
(5) Graduate  Advanced Quantum Mechanics 562, (syllabus)


Courses taught from 2011-2017

(1) Undergraduate/Graduate:  Introduction to Quantum Mechanics, PH4713/6713, (syllabus)

(2) Undergraduate/Graduate:  Applications of Quantum Mechanics, PH4723/6723, (syllabus)

(3) Undergraduate:  Electricity and Magnetism, PH2223, (syllabus)

(4) Undergraduate:  Mechanics, PH2213, (syllabus)