Journal Publications

Note 1: Asterisk (*) indicates corresponding author.
Note 2: Dagger (†) indicates equal contributions.

35. H. Joo†, D. Burt†, Y. Jung, Y. Kim, Y. Huang, and D. Nam*, “Strain-Relaxed GeSn-on-Insulator (GeSnOI) Microdisks,” Under Review 

34. X. Gao†, H. Sun†, Q. Wang, and D. Nam*, Dynamically Tunable Moiré Superlattice via Heterostrain Engineering,” Under Review 

33. Y. Jung†, Y. Kim†, D. Burt, H. Joo, D. Kang, M. Luo, L. Zhang, C. Tan, and D. Nam*, Biaxially Strained Germanium Crossbeam with High-Quality Optical Cavity for On-Chip Laser Applications,” Under Review 

32. D. Kang†, H. Sun†, M. Luo†, K. Lu, Y. Kim, Y. Jung, J. Ge, S. Koh, D. Giovanni, T. Sum, Q. Wang, H. Li, and D. Nam*, Pseudo-Magnetic Field-Induced Ultra-Slow Carrier Dynamics in Periodically Strained Graphene,” Under Review

31. H. Sun, P. Sengupta, D. Nam, and B. Yang“Negative Thermal Hall Conductance in Two-Dimer Shastry-Sutherland Model with π-flux Dirac Triplon,” Phys. Rev. B (Accepted) 

30. H. Sun, Z. Qi, Y. Kim, M. Luo, B. Yang, and D. Nam*, Frequency-Tunable Terahertz Graphene Laser Enabled by Pseudomagnetic Fields in Strain-Engineered Graphene,” Opt. Express 29, 1892-1902 (2021) [PDF]

29. A. Dubrovkin*, B. Qiang, T. Salim, D. Nam, N. Zheludev*, and Q.Wang*, Resonant Nanostructures for Highly Confined and Ultra-Sensitive Surface Phonon Polaritons,” Nature Commun. 11, 1863 (2020) [PDF]

28. Z. Song*, W. Fan, C. Tan, Q. Wang, D. Nam, Z. Hua, and G. Sun, “Band Structure of Strained Ge1-xSnx Alloy: a Full-Zone 30-Band k·p Model,” IEEE J. Quantum Electron. 56(1), 1-8 (2019) [PDF]

27. Z. Song, W. Fan*, C. Tan, Q. Wang, D. Nam, Z. Hua, and G. Sun, “Band Structure of Ge1-xSnx Alloy: a Full-Zone 30-Band k·p Model,” New J. Phys. 21, 073037 (2019) [PDF]

26. H. Joo, M. Shin, H. Jung, H. Cha, D. Nam, and H. Kwon*, “Oxide Thin-Film Transistor-Based Vertically Stacked Complementary Inverter for Logic and Photo-Sensor Operations,” Materials 12(23), 3815 (2019) [PDF]

25. Z. Qi, H. Sun, M. Luo, Y. Jung, and D. Nam*, "Strained Germanium Nanowire Optoelectronic Devices for Photonic-Integrated Circuits," J. Phys. Condens. Matter. 30(33), 334004 (2018) [PDF]

24. S. Gupta*, D. Nam, J. Vuckovic and K. Saraswat, "Room Temperature Lasing Unraveled by a Strong Resonance Between Gain and Parasitic Absorption in Uniaxially Strained Germanium," Phys. Rev. B 97(15), 155127 (2018) [PDF]

23. S. Bao†, D. Kim†, C. Onwukaeme†, S. Gupta†, K. Saraswat, K. Lee, Y. Kim, D. Min, Y. Jung, H. Qiu, H. Wang, E. A. Fitzgerald, C. Tan* and D. Nam*, "Low-Threshold Optically Pumped Lasing in Highly Strained Ge Nanowires," Nature Commun. 8(1), 1845 (2017) [PDF]
Featured in LaserFocusWorldChannel NewsAsiaetc. 

22. D. Kim, S. Bao, C. Tan, J. Nam, K. Saraswat and D. Nam*, “[Invited] The Effect of Germanium/Silicon Interface on Germanium Photonics,” ECS Transactions 75(8), 683-688 (2016) [PDF]

21. D. Sukhdeo†, Y. Kim†, K. Saraswat, B. Dutt and D. Nam*, “Theoretical Modeling for the Interaction of Tin Alloying with N-Type Doping and Tensile Strain for GeSn Lasers,” IEEE Electron Device Lett. 37(10), 1307-1310 (2016) [PDF]

20. J. Baek, B. Ki, D. Kim, C. Lee, D. Nam, Y. Cho, and J. Oh*, “Phosphorus Implantation into In-Situ Doped Ge-on-Si for High Light-Emitting Efficiency,” Opt. Mater. Express 6(9), 2939-2946 (2016) [PDF]

19. D. Sukhdeo†, Y. Kim†, S. Gupta, K. Saraswat, B. Dutt and D. Nam*, “Anomalous Threshold Reduction from Uniaxial Strain for a Low-Threshold Ge Laser,” Opt. Comm. 379, 32-35 (2016) [PDF]

18. J. Petykiewicz†, D. Nam†, D. Sukhdeo, S. Gupta, S. Buckley, A. Piggott, J. Vučković* and K. Saraswat*, “Direct Bandgap Light Emission from Strained Ge Nanowire Coupled with High-Q Optical Cavities,” Nano Lett. 16(4), 2168-2173 (2016) [PDF]
Featured in Dong-A IlboDigital TimesNewsisAsia Today, etc.

17. D. Sukhdeo, S. Gupta, K. Saraswat, B. Dutt and D. Nam*, “Impact of Minority Carrier Lifetime on the Performance of Strained Ge Light Sources,” Opt. Comm. 364, 233-237 (2016) [PDF]

16. D. Sukhdeo, S. Gupta, K. Saraswat, B. Dutt and D. Nam*, “Ultimate Limit of Biaxial Tensile Strain and N-Type Doping for Realizing an Efficient Low-Threshold Ge Laser,” Jpn. J. Appl. Phys. 55(2), 024301 (2016) [PDF]

15. D. Sukhdeo, J. Petykiewicz, S. Gupta, D. Kim, S. Woo, Y. Kim, J. Vučković, K. Saraswat and D. Nam*, “Ge Microdisk with Lithographically-Tunable Strain Using CMOS-Compatible Process,” Opt. Express 23(26), 33249-33254 (2015) [PDF]

14. Y. Kim, J. Petykiewicz, S. Gupta, J. Vučković, K. Saraswat, and D. Nam*, “Strained Ge Light Emitter with Ge on Dual Insulators for Improved Thermal Conduction and Optical Insulation,” IEIE SPC 4(5), 318-323 (2015) [PDF]

13. D. Sukhdeo, D. Nam*, J. Kang, M. Brongersma and K. Saraswat, “Bandgap-Customizable Germanium Using Lithographically Determined Biaxial Tensile Strain for Silicon-Compatible Optoelectronics,” Opt. Express 23(13), 16740-16749 (2015) [PDF]

12. J. Nam*, F. Afshinmanesh, D. Nam, W. Jung, T. Kamins, M. Brongersma, and K. Saraswat, “Monolithic Integration of Germanium-on-Insulator P-I-N Photodetector on Silicon,” Opt. Express 23(12), 15816-15823 (2015) [PDF]

11. J. Nam, S. Alkis, D. Nam, F. Afshinmanesh, J. Shim, J. Park, M. Brongersma, A. Okyay, T. Kamins and K. Saraswat*, “Lateral Overgrowth for Monolithic Integration of Germanium-on-Insulator on Silicon,” J. Cryst. Growth 416, 21-27 (2015) [PDF]

10. D. Nam*, J. Kang, M. Brongersma and K. Saraswat, “Observation of Improved Minority Carrier Lifetimes in High-Quality Ge-on-Insulator Using Time-Resolved Photoluminescence,” Opt. Lett. 39(21), 6205-6208 (2014) [PDF]

9. D. Nam, D. Sukhdeo, B. Dutt and K. Saraswat*, “[Invited] Light Emission from Highly-Strained Germanium for On-Chip Optical Interconnects,” ECS Transactions 64(6), 371-381 (2014) [PDF]

8. D. Nam, D. Sukhdeo, S. Gupta, J. Kang, M. Brongersma and K. Saraswat, “Study of Carrier Statistics in Uniaxially Strained Ge for a Low-Threshold Ge Laser,” IEEE J. Sel. Top. Quant. Electron. 20(4), 16-22 (2014) [PDF]

7. D. Sukhdeo, D. Nam*, J. Kang, M. Brongersma and K. Saraswat, “[Invited] Direct Bandgap Germanium-on-Silicon Inferred from 5.7% Uniaxial Tensile Strain,” Photonics Research 2(3), A8-A13 (2014) [PDF]
Highlights: Selected as #1 most cited paper during 2014-2015

6. B. Dutt, H. Lin, D. Sukhdeo, B. Vulovic, S. Gupta, D. Nam, K. Saraswat, and J. Harris, “Theoretical Analysis of GeSn Alloys as a Gain Medium for a Si-Compatible Laser,” IEEE J. Sel. Top. Quant. Electron. 19(5), 1502706 (2013) [PDF]

5. D. Nam, D. Sukhdeo, J. Kang, J. Petykiewicz, J. Lee, W. Jung, J. Vuckovic, M. Brongersma*, and K. Saraswat*, “Strain-Induced Pseudoheterostructure Nanowires Confining Carriers at Room Temperature with Nanoscale-Tunable Band Profiles,” Nano Lett. 13(7), 3118-3123 (2013) [PDF]

4. B. Dutt*, D. Sukhdeo, D. Nam, B. Vulovic, Z. Yuan, and K. Saraswat, “Roadmap to an Efficient Germanium-on-Silicon Laser: Strain vs. n-Type Doping,” IEEE Photon. J. 4(5), 2002-2009 (2012) [PDF]

3. W. Jung, J. Park, A. Nainani, D. Nam, and K. Saraswat, “Fluorine Passivation of Vacancy Defects in Bulk Ge Metal-Oxide-Semiconductor Field Effect Transistor Application,” Appl. Phys. Lett. 101(7), 072104 (2012) [PDF]

2. D. Nam, D. Sukhdeo, S. Cheng, K. Huang, A. Roy, M. Brongersma, Y. Nishi, and K. Saraswat, “Electroluminescence from Strained Ge Membranes and Implications for an Efficient Si-Compatible Laser,” Appl. Phys. Lett. 100(13), 131112 (2012) [PDF]

1. D. Nam*, D. Sukhdeo, A. Roy, K. Balram, S. Cheng, K. Huang, Z. Yuan, M. Brongersma, Y. Nishi, D. Miller and K. Saraswat, “Strained Germanium Thin Film Membrane on Silicon Substrate for Optoelectronics,” Opt. Express 19(27), 25866-25872 (2011) [PDF]

Patent

6. Non-Drafted Singapore Patent Application: “Biaxially Strained Crossbeam Germanium Laser Structure,” D. Nam, D. Burt, Y. Jung, Y. Kim, H. Joo, Submitted on 16 Dec 2020

5. Non-Drafted Singapore Patent Application: “Graphene Nanopillar Structures for Giant Pseudo-Magnetic Fields,” D. Nam, D. Kang, M. Luo, H. Sun, X. Gao, K. Lu, Submitted on 15 Dec 2020

4. Non-Drafted Singapore Patent Application: Triaxially Strained Graphene Structure for Large-Area Pseudo-Magnetic Field,” D. Nam, H. Sun, M. Luo, D. Burt, D. Kang, Submitted on 14 Dec 2020

3. Non-Drafted Singapore Patent Application, Application Number 10202012548S: An Electrically Pumped Strained GeSn Laser Structure,” D. Nam, D. Burt, Y. Jung, Y. Kim, H. Joo, Filed on 15 Dec 2020

2. Non-Drafted Singapore Patent Application, Application Number 10201806832X: Highly Strained Germanium Laser on A Silicon Platform,” D. Nam, C. Tan, Filed on 13 Aug 2018

1. US Patent No.0,372,455: Crossed Nanobeam Structure for a Low-Threshold Germanium Laser,” D. Nam, J. Petykiewicz, D. Sukhdeo, S. Gupta, J. Vuckovic, K. Saraswat, Issued Sept. 9, 2015 [LINK]