Observation of quantum phase transition in spin-orbital-angular-momentum coupled Bose-Einstein condensate
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arXiv
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| Format: | Preprint |
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2018
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| _version_ | 1866913485002113024 |
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| author | Zhang, Dongfang Gao, Tianyou Zou, Peng Kong, Lingran Li, Ruizong Shen, Xing Chen, Xiao-Long Peng, Shi-Guo Zhan, Mingsheng Pu, Han Jiang, Kaijun |
| author_facet | Zhang, Dongfang Gao, Tianyou Zou, Peng Kong, Lingran Li, Ruizong Shen, Xing Chen, Xiao-Long Peng, Shi-Guo Zhan, Mingsheng Pu, Han Jiang, Kaijun |
| contents | Orbital angular momentum (OAM) of light represents a fundamental optical freedom that can be exploited to manipulate quantum state of atoms. In particular, it can be used to realize spin-orbital-angular-momentum (SOAM) coupling in cold atoms by inducing an atomic Raman transition using two laser beams with differing OAM. Rich quantum phases are predicted to exist in many-body systems with SOAM coupling. Their observations in laboratory, however, are often hampered by the limited control of the system parameters. In this work we report, for the first time, the experimental observation of the ground-state quantum phase diagram of the SOAM coupled Bose-Einstein condensate (BEC). The discontinuous variation of the spin polarization as well as the vorticity of the atomic wave function across the phase boundaries provides clear evidence of first-order phase transitions. Our results open up a new way to the study of phase transitions and exotic quantum phases in quantum gases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1806_06263 |
| institution | arXiv |
| publishDate | 2018 |
| record_format | arxiv |
| spellingShingle | Observation of quantum phase transition in spin-orbital-angular-momentum coupled Bose-Einstein condensate Zhang, Dongfang Gao, Tianyou Zou, Peng Kong, Lingran Li, Ruizong Shen, Xing Chen, Xiao-Long Peng, Shi-Guo Zhan, Mingsheng Pu, Han Jiang, Kaijun Quantum Gases Atomic Physics Quantum Physics Orbital angular momentum (OAM) of light represents a fundamental optical freedom that can be exploited to manipulate quantum state of atoms. In particular, it can be used to realize spin-orbital-angular-momentum (SOAM) coupling in cold atoms by inducing an atomic Raman transition using two laser beams with differing OAM. Rich quantum phases are predicted to exist in many-body systems with SOAM coupling. Their observations in laboratory, however, are often hampered by the limited control of the system parameters. In this work we report, for the first time, the experimental observation of the ground-state quantum phase diagram of the SOAM coupled Bose-Einstein condensate (BEC). The discontinuous variation of the spin polarization as well as the vorticity of the atomic wave function across the phase boundaries provides clear evidence of first-order phase transitions. Our results open up a new way to the study of phase transitions and exotic quantum phases in quantum gases. |
| title | Observation of quantum phase transition in spin-orbital-angular-momentum coupled Bose-Einstein condensate |
| topic | Quantum Gases Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/1806.06263 |